JPH0239141A - X-ray radiographing device - Google Patents

Abstract

PURPOSE:To shorten a radiographing time and to radiograph even an object whose blood flow is fast just by injecting a contrast agent once by simultaneously executing the exchange of film and the movement of a bed. CONSTITUTION:After an X-ray radiographing device 1 performs radiographing in a stage I for a time (t), the film already radiographed is housed and new film is loaded and the radiographing action is stopped to get in a waiting state until completing the movement of the bed 2. Meanwhile, an X-ray exposure signal and a bed movement signal are simultaneously outputted from a main control part 5. The X-ray exposure is performed as soon as the X-ray exposure signal is inputted but the bed 2 is moved to a next radiographing position in a specified moving time (tm) after a specified delay time (td) from a time when the signal is inputted. Namely, the X-ray exposure is performed for the delay time (td) and the bed 2 is allowed to be moved while exchanging the film. Radiographing is performed in the stages II-V, in the same way, and then radiographing a patient is completed. Thus, the radiographing time can be shortened by a time equal to the loading/unloading time of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an X-ray imaging apparatus in which a bed is moved to an imaging position when performing X-ray imaging of a lower extremity or the like.

[Prior Art] Conventionally, an angiography method called lower extremity arteriography has been widely known when performing X-ray photography of the lower extremities. The most common target for this contrast imaging method is occlusive arterial disease, but since the entire long area from the lower abdominal aorta to the tips of the legs is continuously imaged at several locations, the blood flow rate in the contrast area is It is difficult to determine the contrast medium injection rate and contrast timing considering the

One of these contrast imaging methods is a moving bed continuous imaging method, and FIG. 5 is a block diagram of a moving bed lower limb angiography apparatus using this method. Above the X-ray imaging device 1, there is a
A bed 2 on which a person is placed is movable in the front and rear directions by a bed driving section 3.

An X-ray tube 4 is installed above the X-ray imaging device l with the subject P in between, and xi! xlit emitted from a tube 4
In this case, the X-ray image of the subject P will be transferred to the X-ray imaging device 1, and the bed 2 will move and stop intermittently, dividing the area from the lower part of the abdominal aorta to the tips of the feet into several locations. Take a photo.

In this imaging device, the moving speed of the bed 2 in one movement is, for example, 12.2 cm/sec, and the moving distance is 23 cm/sec.
m, and in order to photograph the subject P, the subject P is moved up to four times, and as shown in Fig. 6, the subject P is divided into five parts, starting with the pelvis A and then the thigh B. , III fossa C1 lower 1
The incision D and the foot E are photographed at stages ① to V, and the photographing of the subject P is completed.

In addition, the X-ray imaging apparatus 1 has an imaging speed (EPS) and an imaging time (T) at each stage where the bed 2 is stopped.
IME) and a photography program for bed movement commands can be set. Generally, when a contrast medium is injected from the femoral artery, the time required for the contrast medium to reach each site from the start of injection is greatly increased! It is said that it takes 2 to 3 seconds for part 1 B, 4 to 5 seconds for fossa III C, 9 to 12 seconds for lower leg area, and 15 to 20 seconds for foot area E, but the contrast agent is applied to each area. The photographing program is set taking into account the arrival time of. In the stage where movement of bed 2 is programmed, X-ray exposure is performed the number of times of EPS XTIME, and at the same time, after repeated storage of exposed film and loading of new film, bed 2 is moved and the next Move to stage.

Figure 7 shows a standard imaging program, in which a contrast agent is continuously injected for 10 seconds, and after imaging of pelvic region A is completed, bed 2 is moved to the next imaging position and bed 2 is stopped. It is better to inject a sufficient amount of contrast agent while the image is being imaged to repeat the actions such as taking the next image, so that the intensity of each seismic intensity at each imaged area is better balanced and details such as the course of blood vessels are depicted. X-ray pictures can be taken.

However, in general, there is a feeling of pain when injecting a contrast medium, and injecting a large amount of contrast medium at one time has a negative effect on the human body.Therefore, it is preferable to reduce the time and number of injections. Recently, in the case of contrast imaging of the lower extremities, in order to reduce the amount of contrast agent to be injected, each region A to E is imaged with only one injection at the beginning.

[Problems to be Solved by the Invention] However, when imaging each part of the lower extremity with a single contrast medium injection, the speed of blood flow varies significantly depending on the individual, and it is difficult for subjects P who have a fast blood flow to take pictures. 12 days after injecting the contrast medium
After ~13 seconds, the contrast medium has already become diluted in the foot E, and there is a possibility that an X-ray photograph with good contrast cannot be obtained. Therefore, in the case of such a subject P, it is desirable to photograph each region from the pelvic region A to the foot E within about 10 seconds after injecting the contrast medium.

However, with conventional X-ray equipment, five body parts are
For example, if it takes 1.9 seconds for one movement to take a picture while moving, the total time is 1.9 x 4 = 7.6
It will take seconds to move. Furthermore, it takes at least 1 second to store and load the photographic film, and the total photographing time including loading and unloading the film requires lX5=5 seconds. In other words, it takes 7.6+5=12.6 seconds from the start of photography to the time when all five locations are photographed, making it impossible to photograph in the targeted 10 seconds.

[Object of the Invention] The object of the present invention is to allow the storage of a photographed film and the loading of the next photographic film at the same time as the movement of the bed.
To provide an X-ray photographing device capable of shortening photographing time by the time taken to attach and detach a film.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to sequentially X-ray multiple parts of a subject on a bed by moving the bed.
In an X-ray imaging device that takes radiographs, x from the X-ray generator
The apparatus comprises a photographing means for photographing a vj image, an exchanging means for exchanging the film after photographing by the photographing means, and a moving means for starting to move the bed for photographing the next part while the exchanging means is being executed. This is an X-ray imaging device characterized by the following.

[Embodiments of the Invention] The present invention will be described in detail based on the embodiments shown in FIGS. 1 to 4. Note that the same reference numerals as in FIG. 5 indicate the same members.

FIG. 1 is a block circuit configuration diagram of the present invention, and the output terminals of the main control 15, which controls the drive timing of each part of the apparatus, include an X-ray generation control section 6, a bed control section 7, and an X-ray imaging apparatus 1.
The output of the X-ray generation control section 6 is connected to the X-ray tube 4, and the output of the bed control section 7 is connected to the bed driving section 3 for driving the bed 2. Here, the main control section 5 controls the loading and unloading of the film in the X-ray imaging apparatus 1 according to the imaging program programmed for each of a plurality of stages, and sends an X-ray exposure signal to the X-ray generation control section 6. Each bed movement signal is output to the bed control section 7. On the other hand, the X-ray generation control section 6 receives the X-ray exposure signal.
The bed control unit 7, which emits XLA from the radiation tube 4 and receives the bed movement signal, drives the bed driving unit 3 after a certain delay time to move the bed 2 to the next imaging position.

FIG. 2 shows the timing of imaging, and each part A to E of the subject P shown in FIG. 2 is a timing chart diagram of a photographing program for moving the device 2, in which each device operates in a high level state and stops operating in a low level state. At stage ■, the X-ray imaging device l performs imaging during time t, then stores the film that has already been taken and attaches a new film, and then stops operating and enters a standby state until the movement of the bed 2 is completed. becomes. On the other hand, the main control unit 5 outputs the X-ray exposure signal and the bed movement signal at the same time, and the X-ray exposure is performed at the same time as the input of the X-ray exposure signal, but the bed 2 receives the signal for a predetermined delay time after the signal is input. After td, it takes a predetermined moving time tm to move to the next imaging position. That is, X-ray exposure is performed during the delay time td, and the bed 2 is moved even while the film is being replaced. Thereafter, imaging is similarly performed at stages ① to V, and the imaging of the subject P is completed.

Next, FIG. 3 shows a timing chart when radiography is performed using the same radiography program as in this embodiment using a conventional X-ray imaging apparatus, and the radiography times in this embodiment and the conventional example are compared. In the conventional example, since the bed 2 starts moving after the X-ray imaging device 1 has taken an image and replaced the film, the time required for stage 2 is t+tm. However, in this embodiment, as shown in FIG. 2, it is td+tm, and t-td
It is possible to shorten the time only at stage (3). In fact, when calculating the shooting time t = 1 second, the delay time td = 0, 2 seconds, and the movement time tm = 1, 9 seconds, the time reduced by m by four movements from stage r to stage ■ is 4x (1 −
0,2) = 3.2 seconds, and the total imaging time required in the conventional example was 12.6 seconds, but in this example, it was 9.2 seconds.
4 seconds, making it possible to complete shooting within 10 seconds.

Even when performing multiple X-ray exposures in one stage,
As shown in the timing chart of FIG. 4, the film exchange and the movement of the bed 2 can be performed simultaneously by sending a bed movement signal to the bed control section 7 at the same time as the last X-ray exposure signal of the first stage. , it becomes possible to shorten the shooting time.

[Effects of the Invention] As explained above, the X-ray imaging apparatus according to the present invention shortens the imaging time by changing the film and moving the bed at the same time. Photographs can be taken with just one injection.

[Brief explanation of the drawing]

Figure 1 is a block circuit configuration diagram of an embodiment of the X-ray imaging apparatus according to the present invention, Figure 2 is a timing chart diagram, and Figure 3 is a timing chart diagram.
The figure is a timing chart diagram of the conventional side, FIG. 4 is a timing chart diagram of another shooting program in this embodiment,
FIG. 5 is an explanatory diagram of a lower extremity angiography method, FIG. 6 is an explanatory diagram of a pseudomorphic region in lower extremity imaging, and FIG. 7 is a conventional general timing chart. Reference numeral 1 is an X-ray imaging device, 2 is a bed, 3 is a bed drive unit, 4
5 is an X-ray tube, 5 is a main control section, 6 is an X-ray generation control section, and 7 is a bed control section. Patent applicant: Canon Co., Ltd.DrawingsFigure 1Figure 2Figure 3Figure 4Book - Volume 1

Claims (1)

[Claims] 1. In an X-ray imaging device that sequentially takes X-ray images of multiple parts of a subject on the bed by moving the bed, there is an imaging device that takes X-ray images from an X-ray generator, and An X-ray imaging apparatus comprising: exchanging means for exchanging a film; and moving means for starting the movement of the bed for imaging the next region during execution of the exchanging means.