JP6285370B2 - Endoscope processor device, operation method of endoscope processor device, endoscope control program, and endoscope system - Google Patents

Description

  The present invention relates to a processor device for an endoscope that independently controls a plurality of semiconductor light sources such as LEDs and LDs, a method for operating the processor device for an endoscope, a control program for an endoscope, and an endoscope system. .

  In a medical field, diagnosis using an endoscope system including a light source device, an endoscope, and a processor device is widely performed. The light source device generates illumination light for illuminating the observation target. The endoscope captures an observation target illuminated with illumination light with an image sensor and outputs an image signal. The processor device generates an image to be observed from the image signal transmitted from the endoscope and displays the image on the monitor.

  In the endoscopic field, in addition to the normal mode for performing conventional normal observation, a plurality of observation modes such as a low oxygen mode for observing whether or not the observation target is in a hypoxic state are simultaneously executed. Displaying a plurality of obtained images is being performed.

  However, when performing a plurality of observation modes, it is necessary to irradiate more illumination light as the number of observation modes increases. As described above, when a large number of illumination lights are used, an image obtained in each observation mode is greatly affected by the movement and often causes a positional shift, and as a result, the image quality may be deteriorated. Further, when images obtained in a plurality of observation modes are displayed on the monitor at the same time, a delay in drawing is noticeable between the images.

  Therefore, in Patent Document 1, when the same illumination light is used in a plurality of observation modes, the illumination light is irradiated at the same time without being radiated at different timings, thereby reducing the number of illumination lights. The image obtained in the mode is not affected by the movement.

Patent 5496075

  As described above, when displaying images obtained in a plurality of observation modes on the monitor at the same time, the doctor does not observe all the observation mode images at the same time. In many cases, the image in the other observation mode is temporarily observed as the image in the sub-observation mode while the image in the observation mode is almost always observed.

  Here, when a plurality of illumination lights are used in each of the main observation mode and the sub-observation mode, depending on the emission order of the illumination lights, the interval of the emission timing of each illumination light used in the main observation mode may be in the sub-observation mode. It may be longer than the interval of the emission timing of each illumination light used. In this case, although the image in the main observation mode is an image that is always observed, the image quality is more likely to deteriorate due to the influence of the motion than the image in the sub-observation mode that is observed only temporarily. Accordingly, it has been required to set the light emission order for the illumination light used for generating the observation mode image having a high priority, such as the main observation mode image, so that the interval of the emission timing of each illumination light is shortened.

  The present invention relates to a processor device for an endoscope that can prevent image quality degradation of an image generated in each observation mode when displaying images in a plurality of observation modes, a method for operating the processor device for an endoscope, It is an object to provide an endoscope control program and an endoscope system.

  In order to achieve the above object, an endoscope processor device according to the present invention includes a first illumination light, a second illumination light having a spectrum different from that of the first illumination light, a first illumination light, and a second illumination light. In the processor device connected to the endoscope system having a plurality of observation modes using at least one of the plurality of illumination lights including the third illumination light having different spectra with respect to each of A mode operation unit that selects at least the first observation mode and the second observation mode and sets a priority for each selected observation mode, and illumination light used in the selected observation mode from among a plurality of illumination lights An illumination light selection unit to select, which selects the first illumination light and the second illumination light as the illumination light used in the first observation mode, and the first illumination light and the third illumination light as the illumination light used in the second observation mode. Selection An illumination light selection unit, an interval between light emission timings of the first illumination light and the second illumination light used in the first observation mode, and an interval between light emission timings of the first illumination light and the third illumination light used in the second observation mode. Includes a light emission order determination unit that determines the light emission order of the illumination light used in the selected observation mode so as to be determined by the priority.

  The operating method of the processor device of the present invention includes a first illumination light, a second illumination light having a spectrum different from that of the first illumination light, and a third having a spectrum different from each of the first illumination light and the second illumination light. In the operating method of the processor device connected to the endoscope system having a plurality of observation modes using at least one of the plurality of illumination lights including the illumination light, the mode operation unit starts from the plurality of observation modes. The step of selecting at least the observation mode and the second observation mode and setting the priority for each selected observation mode, and the illumination light selection unit using the illumination mode selected from the plurality of illumination lights An illumination light selection unit that selects light, wherein the first illumination light and the second illumination light are selected as the illumination light used in the first observation mode, and the first illumination light and the second illumination light are used as the illumination light used in the second observation mode. The step of selecting the illumination light, the light emission order determination unit determining the interval between the emission timings of the first illumination light and the second illumination light used in the first observation mode, and the first illumination light and the third illumination used in the second observation mode. Determining the light emission order of the illumination light used in the selected observation mode so that the interval of the light emission timing is determined by the priority.

  The endoscope control program of the present invention has different spectra for the first illumination light, the second illumination light having a spectrum different from that of the first illumination light, and the first illumination light and the second illumination light, respectively. An endoscope control program installed in a processor device connected to an endoscope system having a plurality of observation modes using at least one of a plurality of illumination lights including a third illumination light. A mode operation unit that selects at least the first observation mode and the second observation mode from the plurality of observation modes and sets the priority for each selected observation mode; and the observation selected from the plurality of illumination lights Illumination light selection unit for selecting illumination light used in the mode, selecting the first illumination light and the second illumination light as illumination light used in the first observation mode, and using the illumination light in the second observation mode Then, the illumination light selector that selects the first illumination light and the third illumination light, the interval between the emission timings of the first illumination light and the second illumination light used in the first observation mode, and the first illumination mode used in the second observation mode. It functions as a light emission order determination unit that determines the light emission order of the illumination light used in the selected observation mode so that the interval between the light emission timings of the illumination light and the third illumination light is determined by priority.

  An endoscope system including a processor device according to the present invention is illuminating with a light source unit that emits at least first illumination light, second illumination light, and third illumination light as light for illuminating an observation target, and illumination light. An imaging device that images the observation target and outputs an image signal, images the observation target being illuminated with the first illumination light, outputs the first image signal, and displays the observation target illuminated with the second illumination light An image pickup device that picks up an image and outputs a second image signal, picks up an observation target being illuminated with the third illumination light and outputs the third image signal, and a first image signal based on the first image signal and the second image signal. An image processing unit that generates at least a first observation mode image and a second observation mode image based on the first image signal and the third image signal.

  The light emission order determining unit preferably determines the light emission order so that the light emission timing of the first illumination light used in the first observation mode is the same as the light emission timing of the first illumination light used in the second observation mode. .

  When the observation mode using two or more illumination lights is selected, the light emission order determination unit emits the light so that the higher the priority of the observation mode, the smaller the emission timing interval of the illumination light used in the selected observation mode. Is preferably determined.

  The mode operation unit preferably sets the priority for each selected observation mode so that the priority of the first observation mode is higher than the priority of the second observation mode.

  The interval between the emission timings of the first illumination light and the second illumination light used in the first observation mode is preferably smaller than the interval between the emission timings of the first illumination light and the third illumination light used in the second observation mode.

  It is preferable to include an observation mode setting unit that sets an observation mode that uses at least illumination light having different spectra among a plurality of observation modes.

  A light emission order that associates and stores an observation mode selection unit that selects at least one observation mode from among a plurality of observation modes, a plurality of observation modes, and a light emission order determined based on a combination of the plurality of observation modes. When a plurality of observation modes are selected by the storage unit and the observation mode selection unit, the observation target is selected in the light emission order associated with the combination of the selected observation modes among the light emission orders stored in the light emission order storage unit. It is preferable to include a light source control unit that controls the light source unit to illuminate.

  According to the present invention, the interval between the emission timings of the first illumination light and the second illumination light used in the first observation mode and the interval between the emission timings of the first illumination light and the third illumination light used in the second observation mode are as follows. Since the order in which the illumination light is emitted is determined so as to be determined by the priority set in each observation mode, it is possible for an endoscope that can prevent image quality degradation of an image generated based on the illumination light used in each observation mode. A processor device, an operation method of a processor device for an endoscope, a control program for an endoscope, and an endoscope system can be provided.

It is an external view of an endoscope system. It is a block diagram which shows the function of an endoscope system. It is a graph which shows the spectral characteristic of a color filter. It is a graph which shows the spectrum of the illumination light of normal mode. It is a graph which shows the spectrum of the 1st illumination light. It is a graph which shows the spectrum of the 2nd illumination light. It is a graph which shows the spectrum of the 3rd illumination light. It is explanatory drawing explaining the 1st light emission order. It is explanatory drawing explaining the 2nd light emission order. It is explanatory drawing explaining the 3rd light emission order. It is a flowchart of a 1st embodiment. It is a block diagram which shows the function of the endoscope system of 2nd Embodiment. It is a graph which shows the spectrum of the 4th illumination light. It is a graph which shows the spectrum of the 5th illumination light. It is a graph which shows the spectrum of the 6th illumination light. It is explanatory drawing explaining the 1st light emission order of 2nd Embodiment. It is explanatory drawing explaining the 2nd light emission order of 2nd Embodiment. It is explanatory drawing explaining the 3rd light emission order of 2nd Embodiment. It is a graph which shows the spectrum of purple light V, blue light B3, green light G, and red light R. It is explanatory drawing which shows the structure of LPF. It is a graph which shows the spectrum of blue light BL. It is a graph which shows the spectrum of the 5th illumination light using blue light BL. It is explanatory drawing which shows the structure of SPF. It is a graph which shows the spectrum of blue light BS. It is a graph which shows the spectrum of the 1st illumination light using blue light BS.

[First Embodiment]
As shown in FIG. 1, the endoscope system 10 includes an endoscope 12, a light source device 14, a processor device 16, a monitor 18, and a console 19. The endoscope 12 is optically connected to the light source device 14 and electrically connected to the processor device 16. The processor device 16 is electrically connected to the monitor 18 and the console 19. The monitor 18 outputs and displays an image to be observed and information attached to the image to be observed. The console 19 functions as a user interface that receives input operations such as function settings. The processor device 16 may be connected to an external recording unit (not shown) for recording images and image information.

  The endoscope 12 includes an insertion portion 12a to be inserted into the body to be observed, an operation portion 12b provided at the proximal end portion of the insertion portion 12a, a bending portion 12c provided at the distal end side of the insertion portion 12a, and a distal end. Part 12d. By operating the angle knob 12e of the operation unit 12b, the bending unit 12c performs a bending operation. By this bending operation, the distal end portion 12d is directed in a desired direction.

  In addition to the angle knob 12e, the operation unit 12b is provided with a zoom operation unit 12f and a mode switch SW (mode switch) 12g. The zoom operation unit 12f is used to input an imaging magnification change instruction that instructs the imaging optical system 30b described later to change the imaging magnification.

  The mode switching SW 12g is used for a measurement mode switching operation. The endoscope system 10 has a normal mode, a single mode, and a multimode as measurement modes. In the normal mode, a normal image having a natural color obtained by imaging an observation target illuminated with white light WL is displayed on the monitor 18.

  In the single mode and the multi mode, an image (hereinafter referred to as a specific image) obtained in an observation mode using light in a specific wavelength band as illumination light is displayed on the monitor 18. In the single mode, the observation target is illuminated with illumination light in any one of a plurality of observation modes. In the multi-mode, the observation target is illuminated with illumination light in two or more observation modes among a plurality of observation modes. In the present embodiment, the observation mode includes a plurality of observation modes including a polar surface blood vessel observation mode and a middle layer blood vessel observation mode.

  In the superficial blood vessel observation mode, the superficial blood vessel emphasis that emphasizes the blood vessels distributed in the superficial layer that is extremely shallow from the surface of the observation target (hereinafter referred to as the superficial blood vessel) among the blood vessels included in the observation target. The image is displayed on the monitor 18. In the middle-layer blood vessel observation mode, a middle-layer blood vessel emphasized image in which blood vessels (hereinafter referred to as middle-layer blood vessels) distributed in a portion of the middle layer among blood vessels included in the observation target is displayed on the monitor 18.

  As shown in FIG. 2, the endoscope 12 includes an illumination optical system 30a and an imaging optical system 30b. The illumination optical system 30 a has an illumination lens 32. The illumination light from the light source device 14 is irradiated to the observation object via the illumination lens 32.

  The imaging optical system 30 b includes an objective lens 42, a zoom lens 44, and an imaging element 46. Various return lights such as reflected light, scattered light, and fluorescence from an observation target illuminated with illumination light enter the image sensor 46 through the objective lens 42 and the zoom lens 44. As a result, an image to be observed is formed on the image sensor 46.

  The zoom lens 44 can change the imaging magnification by freely moving between the tele end and the wide end in accordance with an imaging magnification change instruction from the zoom operation unit 12f. When the zoom lens 44 moves to the wide end, the image to be observed is enlarged. On the other hand, when the zoom lens 44 moves to the telephoto end, the image to be observed is reduced. The zoom lens 44 is disposed at the wide end when non-magnification observation is performed, and is moved from the wide end to the tele end when magnification observation is performed by operation of the zoom operation unit 12f.

  The image sensor 46 is a color image sensor that images an observation target under illumination with illumination light. Each pixel of the image sensor 46 is provided with one of a blue color filter, a green color filter, and a red color filter shown in FIG. For this reason, the image sensor 46 receives the return light from the observation target with the blue pixel provided with the blue color filter, the green pixel provided with the green color filter, and the red pixel provided with the red color filter. . Then, BGR three-color image signals are output from the BGR three-color pixels.

  As the image sensor 46, a charge coupled device (CCD) image sensor or a complementary metal-oxide semiconductor (CMOS) image sensor can be used. Further, instead of the primary color image sensor 46, a complementary color image sensor having complementary color filters of C (cyan), M (magenta), Y (yellow), and G (green) may be used. When the complementary color image sensor is used, four color image signals of CMYG are output. Therefore, the four color image signals of CMYG are converted to the three color image signals of BGR by complementary color-primary color conversion. The image signal of each BGR color similar to that of the image sensor 46 can be obtained. Further, instead of the image sensor 46, a monochrome image sensor without a color filter may be used.

  A CDS / AGC (Correlated Double Sampling / Automatic Gain Control) circuit 47 performs correlated double sampling (CDS) and automatic gain control (AGC) on an analog image signal obtained from the image sensor 46. The image signal that has passed through the CDS / AGC circuit 47 is converted into a digital image signal by an A / D (Analog / Digital) converter 48. The digital image signal after the A / D change is input to the processor device 16.

  The light source device 14 includes a light source unit 20 and a light source control unit 21 that controls the light source unit 20 (see FIG. 2). The light source unit 20 includes a plurality of semiconductor light sources. The light source unit 20 turns on or turns off the plurality of semiconductor light sources, and emits illumination light for illuminating the observation target by controlling the light emission amount of each semiconductor light source. In the present embodiment, the light source unit 20 includes a V-LED (Violet Light Emitting Diode) light source 20a, a B-LED (Blue Light Emitting Diode) light source 20b, a G-LED (Green Light Emitting Diode) light source 20c, and an R-LED. (Red Light Emitting Diode) has a light source 20d.

  The V-LED light source 20a is a purple semiconductor light source that emits purple light V having a center wavelength of 405 nm and a wavelength band of 380 nm to 420 nm. The B-LED light source 20b is a blue semiconductor light source that emits blue light B1 having a center wavelength of 445 nm and a wavelength band of 405 nm to 485 nm. The G-LED light source 20c is a green semiconductor light source that emits green light G having a wavelength band ranging from 480 nm to 600 nm. The R-LED light source 20d is a red semiconductor light source that emits red light R with a center wavelength of 620 nm to 630 nm and a wavelength band of 600 nm to 650 nm. The center wavelengths of the V-LED light source 20a and the B-LED light source 20b have a width of about ± 5 nm to ± 10 nm.

  The light source control unit 21 inputs a control signal independently to each of the light sources 20a to 20d. Thereby, the light source control unit 21 adjusts the light emission timing, the light emission period, the light amount, and the spectral spectrum of the illumination light by independently controlling the lighting and extinction of each of the light sources 20a to 20d and the light emission amount at the time of lighting. I do.

  For example, in the normal mode, the light source controller 21 turns on the V-LED light source 20a, the B-LED light source 20b, the G-LED light source 20c, and the R-LED light source 20d. When the light sources 20a to 20d are turned on, the light emission amounts of the violet light V, the blue light B1, the green light G, and the red light R are controlled to a specific ratio. In FIG. 4, illumination light in which purple light V, blue light B1, green light G, and red light R are combined by an optical path combining unit 23 is used as white light WL in the normal mode.

  In the single mode, the light source control unit 21 controls the light sources 20a to 20d according to the observation mode. In the single mode, one observation mode is selected from a plurality of observation modes by an observation mode selection unit 80 described later. In the present embodiment, in the single mode, for example, the superficial blood vessel observation mode is selected. As illumination light used in the polar surface blood vessel observation mode, for example, the illumination light selection unit 74 described later selects the first illumination light L1 and the second illumination light L2 having a spectrum different from that of the first illumination light L1. Yes. For this reason, in the single mode, the light source control unit 21 controls each of the light sources 20a to 20d so that the first illumination light L1 and the second illumination light L2 are switched.

  In the case of the multi mode, the light source control unit 21 controls each of the light sources 20a to 20d according to a combination of a plurality of observation modes. In the case of the multi-mode, at least a first observation mode and a second observation mode are selected from a plurality of observation modes by an observation mode selection unit 80 described later. In the present embodiment, in the multi-mode, for example, the extreme surface blood vessel observation mode is selected as the first observation mode, and the middle blood vessel observation mode is selected as the second observation mode. As the illumination light used in the middle-layer blood vessel observation mode, for example, the illumination light selection unit 74 (to be described later) uses, for example, a third spectrum having different spectra for the first illumination light L1, the first illumination light L1, and the second illumination light L2. The illumination light L3 is selected. For this reason, the light source control part 21 controls each light source 20a-20d so that the 1st illumination light L1, the 2nd illumination light L2, and the 3rd illumination light L3 can be switched. In the case of the multi mode, the light source control unit 21 controls the light emission timing of the first illumination light L1 to the third illumination light L3 according to the light emission order determined by the light emission order determination unit 76 described later.

  In FIG. 5, the light source control unit 21 turns on the B-LED light source 20b and the R-LED light source 20d and turns off the V-LED light source 20a and the G-LED light source 20c, whereby blue light B1 and red light are emitted. Illumination light in which R is coupled by the optical path coupling unit 23 is referred to as first illumination light L1.

  In FIG. 6, the light source control unit 21 turns on the V-LED light source 20 a and the R-LED light source 20 d and turns off the B-LED light source 20 b and the G-LED light source 20 c, thereby causing purple light V and red light. Illumination light in which R is coupled by the optical path coupling unit 23 is referred to as second illumination light L2.

  In FIG. 7, the light source control unit 21 turns on the G-LED light source 20c and the R-LED light source 20d, and turns off the V-LED light source 20a and the B-LED light source 20b. The illumination light in which R is coupled by the optical path coupling unit 23 is referred to as a third illumination light L3.

  The optical path coupling unit 23 includes a mirror, a lens, and the like, and emits illumination light emitted from the light source unit 20 to a light guide 25 inserted into the insertion unit 12a. The light guide 25 is built in the endoscope 12 and the universal cord (a cord connecting the endoscope 12, the light source device 14, and the processor device 16). The light guide 25 propagates the illumination light incident from the optical path coupling unit 23 to the distal end portion 12 d of the endoscope 12 through the illumination lens 32.

  The processor device 16 includes an imaging control unit 52, an image signal acquisition unit 54, a DSP (Digital Signal Processor) 56, a noise removal unit 58, an image processing switching unit 60, a normal image processing unit 62, and specific image processing. Unit 64, video signal generation unit 66, and light emission order determination processing unit 68.

  The imaging control unit 52 captures an image using the imaging element 46 and the light emission timing of the illumination light by the light source control unit 21 in response to the input of the synchronization signal from the light source control unit 21 (or the output of the synchronization signal to the light source control unit 21). Control of synchronization with the frame to be performed and output of an image signal from the image sensor 46 are performed.

  In the normal mode, the imaging control unit 52 controls the imaging element 46 to capture the observation target under illumination with the white light WL for each frame. Accordingly, RGB image signals are output from the pixels of each color for each frame. This imaging control is repeatedly performed while the normal mode is set.

  Further, in the single mode and the multi mode, the imaging control unit 52 controls the imaging element 46 so that the observation target under illumination is captured with each illumination light for each frame. Thereby, the image signal of each RGB color according to each illumination light is output from the pixel of each color for every frame. For example, the imaging element 46 images the observation target under illumination with the first illumination light L1, outputs a first image signal of each color of RGB, images the observation target under illumination with the second illumination light L2, A second image signal of each color of RGB is output, an observation target under illumination is imaged with the third illumination light L3, and a third image signal of each color of RGB is output.

  The image signal acquisition unit 54 acquires a digital image signal from the image sensor 46 via the CDS / AGC circuit 47 and the A / D converter 48. The DSP 56 performs various signal processing such as defect correction processing, offset processing, gain correction processing, linear matrix processing, gamma change processing, and demosaicing processing on the acquired image signal. In the defect correction process, the signal of the defective pixel of the image sensor 46 is corrected. In the offset process, the dark current component is removed from the image signal subjected to the defect correction process, and an accurate zero level is set. In the gain correction process, the signal level is adjusted by multiplying the image signal after the offset process by a specific gain.

  The image signal after gain correction processing is subjected to linear matrix processing for improving color reproducibility. After that, the brightness and saturation are adjusted by gamma change processing. The image signal after the gamma conversion process is subjected to a demosaic process (also called an isotropic process or a synchronization process), and a signal of a color that is insufficient at each pixel is generated by interpolation. By this demosaic processing, all the pixels have signals of each color of BGR. The noise removal unit 58 removes noise by performing noise removal processing (for example, using a moving average method or a median filter method) on the image signal that has been demosaiced by the DSP 56. The image signal from which noise has been removed is transmitted to the image processing switching unit 60.

  The image processing switching unit 60 transmits an image signal to the normal image processing unit 62 when set to the normal mode by the operation of the mode switching SW 12g, and when set to the single mode or the multi mode, The image signal is transmitted to the specific image processing unit 64.

  The normal image processing unit 62 performs color conversion processing, color enhancement processing, and structure enhancement processing on the image signal received from the image processing switching unit 60 to generate a normal image. In the color conversion processing, color conversion processing is performed on the image signal by 3 × 3 matrix processing, gradation change processing, three-dimensional LUT (look-up table) processing, and the like. The color enhancement process is performed on the image signal that has been subjected to the color conversion process. The structure enhancement process is a process for enhancing the structure of an observation target such as a blood vessel or a pit pattern (gland duct), and is performed on the image signal after the color enhancement process. A color image using an image signal subjected to various image processing as described above is a normal image.

  The specific image processing unit 64 generates a specific image signal according to the observation mode based on the image signal. An image using the specific image signal is a specific image. Specifically, the specific image processing unit 64 performs color conversion processing, color enhancement processing, and structure enhancement processing on the image signal to generate a specific image. For example, in the case of the polar surface blood vessel observation mode, as the specific image, a first image signal obtained when the first illumination light L1 is illuminated and a second image signal obtained when the second illumination light L2 is illuminated. Based on the extreme surface blood vessel enhancement image is generated. In the case of the middle-layer blood vessel observation mode, as the specific image, the middle layer based on the first image signal obtained at the time of illumination with the first illumination light L1 and the third image signal obtained at the time of illumination with the third illumination light L3. A blood vessel enhanced image is generated. In the present embodiment, since the extreme surface blood vessel observation mode is selected as the first observation mode, the first observation mode image obtained in the first observation mode is taken as the extreme surface blood vessel emphasized image. Further, since the middle-layer blood vessel observation mode is selected as the second observation mode, the second observation mode image obtained in the second observation mode is set as the middle-layer blood vessel emphasized image.

  The video signal generation unit 66 converts the image signal received from the normal image processing unit 62 or the specific image processing unit 64 into a video signal for display as an image that can be displayed on the monitor 18 and sequentially outputs the video signal to the monitor 18. . Thereby, the normal image is displayed on the monitor 18 when the normal image signal is input, and the specific image is displayed when the specific image signal is input. In the case of the multi mode, a plurality of images generated according to a plurality of observation modes may be displayed side by side in the monitor 18. Further, a plurality of images may be switched and displayed on the monitor 18.

  Below, the determination method of the light emission order of the illumination light used by multi mode is demonstrated. The light emission order determination processing unit 68 includes an observation mode setting unit 70, a mode operation unit 72, an illumination light selection unit 74, a light emission order determination unit 76, a light emission order storage unit 78, and an observation mode selection unit 80. Is provided.

  The observation mode setting unit 70 sets the observation mode. The observation mode is set according to the purpose of diagnosis, for example. In the present embodiment, an extreme surface blood vessel observation mode for observing a polar surface blood vessel and a middle layer blood vessel observation mode for observing a middle blood vessel are set. Moreover, the observation mode setting unit 70 sets an observation mode that uses at least illumination light having different spectra among a plurality of observation modes. Thereby, it is prohibited that the observation mode using the illumination light having the same spectrum is set redundantly. Note that the observation mode setting unit 70 sets the observation mode based on an input operation of the console 19 or the like.

  The mode operation unit 72 selects at least the first observation mode and the second observation mode from the plurality of observation modes, and sets the priority for each selected observation mode. For example, the mode operation unit 72 selects the extreme surface blood vessel observation mode as the first observation mode and selects the middle blood vessel observation mode as the second observation mode from the plurality of observation modes. Further, when setting the priority, for example, for the purpose of observing the extreme surface blood vessel more preferentially than the middle layer blood vessel, the mode operation unit 72 sets the priority of the extreme surface blood vessel observation mode. Set higher than the priority of the middle-layer blood vessel observation mode.

  The illumination light selection unit 74 selects illumination light used in the observation mode selected by the mode operation unit 72 from the plurality of illumination lights. For example, the illumination light selection unit 74 uses the first illumination light L1 and the second illumination light as the illumination light used in the extreme surface blood vessel observation mode among the first illumination light L1, the second illumination light L2, and the third illumination light L3. Select L2. Also. The first illumination light L1 and the third illumination light L3 are selected as illumination light used in the middle layer blood vessel observation mode.

  The light emission order determination unit 76 determines the light emission order of the illumination light used in the multi mode based on the combination of the plurality of observation modes selected by the mode operation unit 72. In accordance with the light emission order determined by the light emission order determination unit 76, the light source control unit 21 controls the light emission timing of the illumination light.

  In FIG. 8, for example, the light emission order determination unit 76 obtains the first light emission order as the light emission order of illumination light used in the polar surface blood vessel observation mode and illumination light used in the middle layer blood vessel observation mode. That is, in the first light emission sequence, the first illumination light L1 is emitted in the first frame, the second illumination light L2 in the second frame, the first illumination light L1 in the third frame, and the third illumination light L3 in the fourth frame. The In the first light emission order, the number of frames is “4”. The number of frames is the number of frames in which imaging is performed according to irradiation of each illumination light. Further, the frame interval in the extreme surface blood vessel observation mode is “1”, and the frame interval in the middle layer blood vessel observation mode is “1”. The frame interval indicates an interval between frames in which the illumination light used in the observation mode is emitted, and corresponds to the interval of the emission timing of the illumination light used in the observation mode. Therefore, the total frame interval amount indicating the total amount of frame intervals in each observation mode is set to “2”.

  When there is no illumination light having the same spectrum among the illumination lights arranged in the first emission order, the emission order determination unit 76 determines the first emission order as the emission order of the illumination light used in the multi mode.

  On the other hand, when there is illumination light with the same spectrum, the second light emission order is obtained by rearranging the first light emission order so that the light emission timings of the illumination light with the same spectrum are the same. In FIG. 9, for example, when the first emission order is the order of the first illumination light L1, the second illumination light L2, the first illumination light L1, and the third illumination light L3, the emission timing of the first illumination light L1. The first light emission order is rearranged so that the same is obtained, and the light emission order of the first illumination light L1, the second illumination light L2, and the third illumination light L3 is obtained as the second light emission order. That is, in the second light emission sequence, the first illumination light L1 is emitted in the first frame, the second illumination light L2 in the first frame, and the third illumination light L3 in the third frame. In this second light emission order, the number of frames is “3”. Further, since the frame interval in the extreme surface blood vessel observation mode is “1” and the frame interval in the middle layer blood vessel observation mode is “2”, the total frame interval is set to “3”.

  The light emission order determination unit 76 determines that the second light emission order obtained is such that the higher the priority is in the observation mode, the smaller the light emission timing interval (that is, the frame interval) of the illumination light used in the selected observation mode. If so, the second light emission order is determined as the light emission order of the illumination light used in the multimode.

  On the other hand, if the determined second light emission order is not set so that the frame interval of the selected observation mode becomes smaller in the observation mode with higher priority, the light emission order determination unit 76 determines the frame interval. The third light emission order is obtained by rearranging the second light emission order so as to be smaller.

  When determining the third light emission order, for example, the light emission order determination unit 76 minimizes the frame interval of the polar surface blood vessel observation mode having the highest priority among the polar surface blood vessel observation mode and the middle blood vessel observation mode. Thus, the frame interval of the second highest priority middle-layer blood vessel observation mode is reduced.

  In FIG. 10, when the second light emission order is the first illumination light L1, the second illumination light L2, and the third illumination light L3, the second light emission order is rearranged to obtain the second illumination light L2 and the first illumination light. The light emission order of the light L1 and the third illumination light L3 is obtained as the third light emission order. That is, in the third light emission sequence, the second illumination light L2 is emitted in the first frame, the first illumination light L1 is emitted in the second frame, and the third illumination light L3 is emitted in the third frame. In the third light emission order, the number of frames is “3”. Further, since the frame interval in the extreme surface blood vessel observation mode is “1” and the frame interval in the middle layer blood vessel observation mode is “1”, the total frame interval is set to “2”. And the light emission order determination part 76 determines a 3rd light emission order as the light emission order of the illumination light used by multimode.

  The light emission order storage unit 78 stores a plurality of observation modes in association with the light emission order determined by the light emission order determination unit 76 based on the combination of the plurality of observation modes. For example, the extreme surface blood vessel observation mode and the middle blood vessel observation mode, and the third light emission order based on the combination of the extreme surface blood vessel observation mode and the middle layer blood vessel observation mode are stored in association with each other.

  The observation mode selection unit 80 selects one or more observation modes from among a plurality of observation modes. Specifically, the observation mode selection unit 80 selects one observation mode from a plurality of observation modes in the single mode. For example, the extreme surface blood vessel observation mode is selected from a plurality of observation modes including the extreme surface blood vessel observation mode and the middle layer blood vessel observation mode.

  On the other hand, the observation mode selection unit 80 selects at least two observation modes from a plurality of observation modes in the multi-mode. For example, the extreme surface blood vessel observation mode and the middle blood vessel observation mode are selected from a plurality of observation modes including the extreme surface blood vessel observation mode and the middle layer blood vessel observation mode. In the multi-mode, when a plurality of observation modes are selected by the observation mode selection unit 80, the light source control unit 21 selects the observation mode selected from the light emission order stored in the light emission order storage unit 78. The light source unit 20 is controlled to illuminate the observation target in the light emission order associated with the combination. Thus, the observation mode selection unit 80 is for a doctor or the like to select an observation mode according to the purpose of diagnosis. For this reason, the observation mode selection unit 80 is connected to the console 19 or the like.

  Next, the effect | action of this invention is demonstrated along the flowchart shown in FIG. When determining the order of illumination light used in the multi-mode, at least a superficial blood vessel observation mode and a middle blood vessel observation mode are selected from a plurality of observation modes (S1). Then, a priority is set for each selected observation mode (S2). For example, the priority in the extreme surface blood vessel observation mode is set higher than the priority in the middle blood vessel observation mode.

  Next, the illumination light used in the polar surface blood vessel observation mode and the illumination light used in the middle blood vessel observation mode are selected from the plurality of illumination lights (S3). For example, among the plurality of illumination lights including the first illumination light L1 to the third illumination light L3, the first illumination light L1 and the second illumination light L2 are selected as the illumination light used in the polar surface blood vessel observation mode, and the middle layer blood vessel observation is performed. The first illumination light L1 and the third illumination light L3 are selected as illumination light used in the mode.

  The interval between the emission timings of the first illumination light L1 and the second illumination light L2 used in the polar surface blood vessel observation mode and the interval between the emission timings of the first illumination light L1 and the third illumination light L3 used in the middle layer blood vessel observation mode are: The light emission order of each illumination light is determined so as to be determined by the priority (S5). For example, the middle-layer blood vessel in which the interval between the emission timings of the first illumination light L1 and the second illumination light L2 used in the polar surface blood vessel observation mode with a high priority is set lower than in the polar surface blood vessel observation mode. The light emission order of the first illumination light L1 to the third illumination light L3 is determined so as to be smaller than the interval between the light emission timings of the first illumination light L1 and the third illumination light L3 used in the observation mode.

  As described above, according to the present invention, when a plurality of observation modes are selected, the illumination light emission order is determined so that the interval of the illumination light emission timing used in the observation mode with the higher priority is shortened. Therefore, it is possible to prevent the image quality of the image generated in the observation mode with high priority from being deteriorated.

[Second Embodiment]
In the first embodiment, the observation mode has a polar surface blood vessel observation mode and a middle blood vessel observation mode, but in the second embodiment, a deep blood vessel observation mode, a hypoxia mode, a surface blood vessel observation mode, A white light observation mode.

  In FIG. 12, the endoscope system 100 is provided with a light source unit 102. The light source unit 102 includes a 473LD (Laser Diode) light source 104 in addition to the light sources 20a to 20d of the light source unit 20 of the first embodiment. The 473LD light source 104 is a blue laser light source that emits blue laser light B2 having a center wavelength of 473 nm. Note that the half-value width of the 473LD light source 104 is preferably about ± 10 nm. As the 473LD light source 104, a broad area type InGaN laser diode can be used, and an InGaNAs laser diode or a GaNAs laser diode can also be used. Since other members are the same as those in the first embodiment, description thereof is omitted.

  Below, the determination method of the light emission order in 2nd Embodiment is demonstrated.

  The observation mode setting unit 70 sets a deep blood vessel observation mode, a low oxygen mode, a surface blood vessel observation mode, and a white light observation mode in addition to the extreme surface blood vessel observation mode and the middle blood vessel observation mode. In the deep blood vessel observation mode, a deep surface blood vessel emphasized image in which the deep blood vessels included in the observation target are emphasized is displayed on the monitor 18. In the low oxygen mode, an oxygen saturation image obtained by imaging the oxygen saturation of blood hemoglobin to be observed is displayed on the monitor 18. In the superficial blood vessel observation mode, a superficial blood vessel enhancement image in which superficial blood vessels included in the observation target are emphasized is displayed on the monitor 18. The white light observation mode is the same as the normal mode, and a normal image is displayed on the monitor 18.

  In the mode operation unit 72, for example, the extreme surface blood vessel observation mode, the middle blood vessel observation mode, the deep blood vessel observation mode, and the hypoxia mode are selected. In addition, the mode operation unit 72 sets, for example, the highest priority in the extreme surface blood vessel observation mode, the second priority in the hypoxia mode, and the third priority in the middle blood vessel observation mode. Set high, and set the priority of the deep blood vessel observation mode to the fourth highest.

  The illumination light selection unit 74 selects the fourth illumination light L4 and the first illumination light L1 having different spectra with respect to the first illumination light L1 to the third illumination light L3 as the illumination light used in the deep blood vessel observation mode. To do. In addition, as illumination light used in the low oxygen mode, a fifth illumination light L5 having a spectrum different from each of the first illumination light L1 to the fourth illumination light L4 and each of the first illumination light L1 to the fifth illumination light L5. On the other hand, the sixth illumination light L6 having a different spectrum is selected.

  In FIG. 13, the fourth illumination light L4 is blue by turning on the B-LED light source 20b and the G-LED light source 20c and turning off the V-LED light source 20a, the R-LED light source 20d, and the 473LD light source 104. It is assumed that the light B1 and the green light G are illumination light combined by the optical path combining unit 23.

  In FIG. 14, the fifth illumination light L5 is blue by turning on the 473LD light source 104, the G-LED light source 20c, and the R-LED light source 20d, and turning off the V-LED light source 20a and the B-LED light source 20b. It is assumed that the laser light B2, the green light G, and the red light R are illumination lights combined by the optical path combining unit 23.

  In FIG. 15, the sixth illumination light L6 is blue by turning on the B-LED light source 20b, the G-LED light source 20c, and the R-LED light source 20d, and turning off the V-LED light source 20a and the 473LD light source 104. It is assumed that the light B1, the green light G, and the red light R are illumination light combined by the optical path combining unit 23.

  In FIG. 16, the light emission order determining unit 76 determines the order of illumination light used in the polar surface blood vessel observation mode, illumination light used in the low oxygen mode, illumination light used in the middle blood vessel observation mode, and illumination light used in the deep blood vessel observation mode. It calculates | requires as 1 light emission order. For example, the first light emission sequence is the first illumination light L1 in the first frame, the second illumination light L2 in the first frame, the fifth illumination light L5 in the third frame, the sixth illumination light L6 in the fourth frame, and the fifth frame. The emission order is the first illumination light L1, the third illumination light L3 in the sixth frame, the fourth illumination light L4 in the seventh frame, and the first illumination light L1 in the eighth frame. In the first light emission order, the number of frames is “8”. The frame interval in the extreme surface blood vessel observation mode is “1”, the frame interval in the hypoxia mode is “1”, the frame interval in the middle blood vessel observation mode is “1”, and the frame interval in the deep blood vessel observation mode is “1”. Therefore, the total frame interval is set to “4”.

  The obtained first light emission order includes the first illumination light L1 as illumination light having the same spectrum. For this reason, the light emission order determination part 76 rearranges the 1st light emission order, and calculates | requires a 2nd light emission order. In FIG. 17, for example, the second light emission sequence is the second illumination light L2 in the first frame, the first illumination light L1 in the second frame, the fifth illumination light L5 in the third frame, and the sixth illumination light in the fourth frame. It is assumed that the third illumination light L3 is emitted in the fifth frame L6, and the fourth illumination light L4 is emitted in the sixth frame. In the second light emission order, the number of frames is “6”. The frame interval in the extreme surface blood vessel observation mode is “1”, the frame interval in the hypoxia mode is “1”, the frame interval in the middle blood vessel observation mode is “3”, and the frame interval in the deep blood vessel observation mode is “4”. Therefore, the total frame interval is set to “9”.

  The obtained second light emission order is not determined such that the higher the priority of the observation mode, the smaller the interval of the emission timing of the illumination light used in the selected observation mode. For this reason, the light emission order determination part 76 rearranges the 2nd light emission order, and calculates | requires a 3rd light emission order. In FIG. 18, for example, the third light emission sequence is the fifth illumination light L5 in the first frame, the sixth illumination light L6 in the second frame, the second illumination light L2 in the third frame, and the first illumination light in the fourth frame. The light emission order is such that the third illumination light L3 is emitted in the fifth frame and the fourth illumination light L4 is emitted in the sixth frame. In the third light emission order, the number of frames is “6”. In addition, the frame interval in the extreme surface blood vessel observation mode is “1”, the frame interval in the hypoxia mode is “1”, the frame interval in the middle blood vessel observation mode is “1”, and the frame interval in the deep blood vessel observation mode is “2”. Therefore, the total frame interval is set to “5”. And the light emission order determination part 76 determines a 3rd light emission order as the light emission order of the illumination light used by multimode.

  In the second embodiment, the 473LD light source 104 that emits the blue laser light B2 having the center wavelength of 473 nm is used. However, instead of the 473LD light source 104, a B-LED light source 110 as shown in FIG. . The B-LED light source 110 is a blue semiconductor light source that emits blue light B3 having a central wavelength of 460 nm and a wavelength band of 420 nm to 500 nm. As shown in FIG. An LPF (long pass filter) 112 is provided on the optical path.

  The LPF 112 generates light having a specific wavelength band from the blue light B3 emitted from the B-LED light source 110. Specifically, as shown in FIG. 21, the LPF 112 cuts the wavelength band on the short wavelength side (less than 460 nm) on the long wavelength side, with the peak wavelength of the blue light B3 emitted from the B-LED light source 110 as a boundary. The wavelength band (wavelength of 460 nm or more) is transmitted. Thereby, the LPF 112 generates blue light BL having a specific wavelength band from the blue light B3.

  The blue light BL is used for the fifth illumination light L5, for example. Specifically, in FIG. 22, the fifth illumination light L5 turns on the B-LED light source 110, the G-LED light source 20c, and the R-LED light source 20d, and the V-LED light source 20a and the B-LED light source 20b. Is turned off to obtain illumination light including blue light BL, green light G, and red light R.

  In the above embodiment, the B-LED light source 20b that emits blue light B1 having a center wavelength of 445 nm is used. However, instead of the B-LED light source 20b, a B-LED light source 110 is provided, and the B-LED light source 110 is further provided. An SPF (short pass filter) 114 shown in FIG. 23 may be provided on the optical path.

  The SPF 114 generates light having a specific wavelength band from the blue light B3 emitted from the B-LED light source 110. Specifically, as shown in FIG. 24, the SPF 114 transmits a wavelength band on the short wavelength side (less than 460 nm) on the long wavelength side, with the peak wavelength of the blue light B3 emitted from the B-LED light source 110 as a boundary. The wavelength band (wavelength of 460 nm or more) is cut. Thereby, the SPF 114 generates a blue light BS having a specific wavelength band from the blue light B3.

  The blue light BS is used for the first illumination light L1, for example. Specifically, in FIG. 25, the first illumination light L1 turns on the B-LED light source 110 and the R-LED light source 20d and turns off the V-LED light source 20a and the G-LED light source 20c. The illumination light includes blue light BS and red light R. The blue light BS may be used for the fourth illumination light L4 and the sixth illumination light in addition to the first illumination light L1.

  In the above embodiment, the priority is set for the observation mode by the mode operation unit 72, but the priority may be set for the interval of the emission timing of each illumination light.

DESCRIPTION OF SYMBOLS 10,100 Endoscope system 12 Endoscope 14 Light source apparatus 16 Processor apparatus 20,102 Light source part 20a V-LED light source 20b, 110 B-LED light source 20c G-LED light source 20d R-LED light source 68 Light emission order determination process part DESCRIPTION OF SYMBOLS 70 Observation mode setting part 72 Mode operation part 74 Illumination light selection part 76 Light emission order determination part 78 Light emission order memory | storage part 80 Observation mode selection part 104 473LD light source 112 LPF (long pass filter)
114 SPF (short pass filter)

Claims (10)

A plurality of light sources including a first illumination light, a second illumination light having a spectrum different from that of the first illumination light, and a third illumination light having a spectrum different from each of the first illumination light and the second illumination light. In the processor device connected to the endoscope system having a plurality of observation modes using at least one or more of the illumination light of
A mode operation unit that selects at least a first observation mode and a second observation mode from a plurality of the observation modes, and sets a priority for each of the selected observation modes;
An illumination light selection unit that selects illumination light used in the selected observation mode from among the plurality of illumination lights, and the first illumination light and the second illumination light are used as illumination light used in the first observation mode. An illumination light selection unit that selects the first illumination light and the third illumination light as illumination light used in the second observation mode;
An interval between emission timings of the first illumination light and the second illumination light used in the first observation mode and an interval between emission timings of the first illumination light and the third illumination light used in the second observation mode. And a light emission order determination unit that determines the light emission order of the illumination light used in the selected observation mode so as to be determined by the priority.   The light emission order determining unit is configured so that the light emission timing of the first illumination light used in the first observation mode is the same as the light emission timing of the first illumination light used in the second observation mode. The processor device according to claim 1, wherein:   When the observation mode using two or more illumination lights is selected, the light emission order determination unit has a smaller interval between the emission timings of the illumination lights used in the selected observation mode as the observation mode has a higher priority. The processor device according to claim 2, wherein the light emission order is determined so that   The mode operation unit sets the priority for each selected observation mode so that the priority of the first observation mode is higher than the priority of the second observation mode. Processor unit.   The interval between the emission timings of the first illumination light and the second illumination light used in the first observation mode is greater than the interval between the emission timings of the first illumination light and the third illumination light used in the second observation mode. 5. The processor device according to claim 4, wherein the processor device is small.   6. The processor device according to claim 1, further comprising an observation mode setting unit configured to set the observation mode using at least illumination light having different spectra from each other among the plurality of observation modes. A plurality of light sources including a first illumination light, a second illumination light having a spectrum different from that of the first illumination light, and a third illumination light having a spectrum different from each of the first illumination light and the second illumination light. In the operating method of the processor device connected to the endoscope system having a plurality of observation modes using at least one of the illumination lights of
A mode operation unit selecting at least a first observation mode and a second observation mode from a plurality of the observation modes, and setting a priority for each of the selected observation modes;
The illumination light selection unit is an illumination light selection unit that selects the illumination light used in the selected observation mode from the plurality of illumination lights, and the first illumination light is used as the illumination light used in the first observation mode. Selecting the second illumination light, and selecting the first illumination light and the third illumination light as illumination light used in the second observation mode;
The light emission order determination unit determines the interval between the light emission timings of the first illumination light and the second illumination light used in the first observation mode, and the first illumination light and the third illumination light used in the second observation mode. And determining a light emission order of illumination light used in the selected observation mode so that an interval of light emission timing is determined by the priority. A plurality of light sources including a first illumination light, a second illumination light having a spectrum different from that of the first illumination light, and a third illumination light having a spectrum different from each of the first illumination light and the second illumination light. In an endoscope control program installed in a processor device connected to an endoscope system having a plurality of observation modes using at least one of the illumination lights of
Computer
A mode operation unit that selects at least a first observation mode and a second observation mode from a plurality of the observation modes, and sets a priority for each of the selected observation modes;
An illumination light selection unit that selects illumination light used in the selected observation mode from among the plurality of illumination lights, and the first illumination light and the second illumination light are used as illumination light used in the first observation mode. An illumination light selection unit that selects the first illumination light and the third illumination light as illumination light used in the second observation mode;
An interval between emission timings of the first illumination light and the second illumination light used in the first observation mode and an interval between emission timings of the first illumination light and the third illumination light used in the second observation mode. A control program for an endoscope that functions as a light emission order determining unit that determines the light emission order of illumination light used in the selected observation mode so as to be determined by the priority. An endoscope system comprising the processor device according to any one of claims 1 to 6,
A light source unit that emits at least the first illumination light, the second illumination light, and the third illumination light as light for illuminating the observation target;
An imaging device that images the observation target under illumination with illumination light and outputs an image signal, images the observation target under illumination with the first illumination light, outputs a first image signal, and the second An imaging device that images the observation target being illuminated with illumination light and outputs a second image signal, images the observation target that is illuminated with the third illumination light, and outputs a third image signal;
Image processing for generating at least a first observation mode image based on the first image signal and the second image signal and a second observation mode image based on the first image signal and the third image signal An endoscope system comprising a unit. An observation mode selection unit that selects at least one of the observation modes from a plurality of the observation modes;
A light emission order storage unit that associates and stores the plurality of observation modes and the light emission order determined based on a combination of the plurality of observation modes;
When a plurality of the observation modes are selected by the observation mode selection unit, the light emission order stored in the light emission order storage unit is the light emission order associated with the selected combination of the observation modes. The endoscope system according to claim 9, further comprising: a light source control unit that controls the light source unit so as to illuminate an observation target.

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