JP4595608B2 - Nuclear medicine diagnostic apparatus and diagnostic system used therefor - Google Patents

Description

  The present invention relates to a nuclear medicine diagnostic apparatus that obtains projection data based on radiation generated from a subject to which a radiopharmaceutical is administered, reconstructs the projection data, and obtains a tomographic image for nuclear medicine of the subject, and a method used therefor In particular, the present invention relates to a technique for obtaining morphological information on a radiation source outside a subject based on radiation irradiated from the radiation source and transmitted through the subject.

  As the above-described nuclear medicine diagnosis apparatus, that is, an ECT (Emission Computed Tomography) apparatus, a PET (Positron Emission Tomography) apparatus will be described as an example. The PET apparatus detects a plurality of γ-rays generated by annihilation of protons, that is, positrons, and reconstructs a tomographic image of a subject only when γ-rays are detected simultaneously by a plurality of detectors. It is configured.

  In this PET apparatus, after a radiopharmaceutical is administered to a subject, the process of drug accumulation in the target tissue is measured over time, whereby quantitative measurement of various biological functions is possible. Therefore, the tomographic image obtained by the PET apparatus has functional information.

  However, in the tomographic image described above, there is a lack of morphological information such as position information. Therefore, as means for acquiring morphological information, absorption correction data (also referred to as “transmission data”) obtained based on γ rays irradiated from an external radiation source and transmitted through the subject are used.

By the way, when collecting diagnostic data such as projection data and tomographic images with the PET apparatus, data on the imaging region in the scanning range is obtained by moving and scanning the top plate on which the subject is placed. The moving speed of the top plate is always constant. When the whole body of the subject is used as an imaging region, the top plate is moved at a constant speed with the scanning range from the head to the foot of the subject (see, for example, Patent Document 1).
JP-A-8-313636 (pages 2, 3 and 1)

  However, in imaging with a PET device for the whole body, the importance of the so-called foot portion below the hip joint is not so high compared to the head and abdomen having many cases. In spite of this, the length of the foot is a high percentage of the whole body, so it takes a lot of time to collect data. Therefore, it is important to determine the part of the subject and change the data collection conditions based on the part. However, a nuclear medicine diagnostic apparatus such as a PET apparatus alone has poor morphological information, so it is difficult to determine the location of the subject only with functional information.

The present invention has been made in view of such circumstances, and a nuclear medicine diagnostic apparatus capable of setting and changing data collection conditions relating to collection of projection data based on the determined region of the subject , and to it It aims at providing the diagnostic system used.

As a result of intensive studies to solve the above problems, the inventors have obtained the following knowledge.
That is, attention was paid to the above-described absorption correction data (transmission data). Originally, the absorption correction data is for performing absorption correction of PET data (projection data), but the absorption correction data itself has form information. Therefore, the nuclear medicine diagnostic apparatus such as a PET apparatus alone has poor morphological information. However, the inventors have obtained the knowledge that the above-described morphological information is used to determine the region of the subject.

The present invention based on such knowledge has the following configuration.
That is, the invention according to claim 1 obtains projection data based on radiation generated from a subject to which a radiopharmaceutical is administered, and reconstructs the projection data to obtain a tomographic image for nuclear medicine of the subject. And a nuclear medicine diagnostic apparatus for obtaining morphological information on a radiation source external to the subject based on radiation irradiated from the radiation source and transmitted through the subject, wherein the site of the subject is based on the morphological information. And a data collection condition setting means for setting and changing a data collection condition relating to the collection of the projection data based on the part of the subject determined by the part determination unit. Is.

[Operation / Effect] According to the invention described in claim 1, a part of the radiation source outside the subject is determined based on the form information obtained from the radiation irradiated from the radiation source and transmitted through the subject. The determination means determines the site of the subject. Using this morphological information, the site of the subject can be easily determined. The data collection condition setting means changes the data collection condition setting based on the part of the subject, thereby reducing the data collection condition collection degree at the less important part and the data collection condition at the more important part. Data collection can be performed efficiently by increasing the degree of collection.

In the above-described example of the invention, it is determined whether or not the part of the subject determined by the part determination unit is a foot (the invention according to claim 2). Further, another example of the above-described invention is that the above-described site determination means detects two peaks in the profile of the morphological information, and there is a drop between the two peaks, and there is a gap between the two peaks. If near the center of the detector, it is determined that the determination target site from which the morphological information is obtained is a foot, and the data collection means is based on the determined site of the subject being a foot. The data collection condition is set and changed (the invention according to claim 3). As a result, it is possible to determine that the part of the subject to be determined is the foot or not the foot, so the data collection condition is collected at a low importance foot and the data is collected at a high importance part. Data collection can be performed efficiently by increasing the degree of collection of the collection conditions.

An example of the data collection condition described above is the moving speed of the top plate on which the subject is placed, and the data collection condition setting means described above changes the setting of the moving speed of the top plate based on the site of the subject ( Invention of Claim 4 ). In this case, based on the part of the subject, the moving speed of the top plate is increased to reduce the degree of collection in the less important part, and the moving speed of the top plate is decreased in the more important part. Collect data efficiently by increasing the degree of collection.

In one example of these inventions described above, the nuclear medicine diagnosis apparatus includes the radiation source described above, and the radiation source emits the same radiation as the above-described radiopharmaceutical (the invention according to claim 5 ). In this example, the nuclear medicine diagnosis apparatus includes a radiation source, and the radiation source irradiates the same radiation as the radiopharmaceutical and passes through the subject, thereby obtaining morphological information based on the radiation. And the site | part of a subject is determined using this form information.

Moreover, you may apply to the diagnostic system used for the nuclear medicine diagnostic apparatus based on the invention mentioned above. That is, this diagnostic system obtains projection data based on a nuclear medicine diagnostic apparatus and X-rays irradiated from the X-ray tube and transmitted through the subject, and reconstructs the projection data to obtain X-ray CT for the subject. An X-ray CT apparatus for obtaining a tomographic image of the nuclear medicine, wherein the nuclear medicine diagnostic apparatus obtains morphological information based on X-rays used in the X-ray CT apparatus, The region of the subject is determined based on the information (the invention according to claim 6 ). In the case of this system, in the X-ray CT apparatus, projection data is obtained based on X-rays irradiated from the outside of the subject and transmitted through the subject, and the projection data is reconstructed and used for X-ray CT of the subject. Using X-rays used when obtaining a tomographic image, morphological information is obtained based on the X-rays. And the site | part of a subject is determined using this form information.

According to the nuclear medicine diagnostic apparatus and the diagnostic system used therefor according to the present invention, the radiation source outside the subject is based on the morphological information obtained from the radiation irradiated from the radiation source and transmitted through the subject. The part determination means determines the part of the subject , and the data collection condition setting means changes the data collection condition relating to the collection of the projection data based on the determined part of the subject . Using this morphological information, it is possible to easily determine the part of the subject, and to change the data collection condition regarding the collection of the projection data based on the determined part of the subject .

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view and a block diagram of a PET (Positron Emission Tomography) apparatus according to an embodiment. In this embodiment, a PET apparatus will be described as an example of a nuclear medicine diagnosis apparatus.

  As shown in FIG. 1, the PET apparatus according to the present embodiment includes a top plate 1 on which a subject M is placed. The top plate 1 is configured to move up and down and translate along the body axis Z of the subject M. In this embodiment, the moving speed of the table 1 along the body axis Z of the subject M is configured to be changed by a table driving unit 6 described later. With this configuration, the subject M placed on the top 1 is scanned from the head to the abdomen and foot sequentially through the opening 2a of the gantry 2, which will be described later. Diagnostic data such as projection data and tomographic images are obtained.

  In addition to the top plate 1, the apparatus according to the present embodiment includes a gantry 2 having an opening 2a, a plurality of scintillator blocks 3a and a plurality of photomultipliers 3b arranged close to each other. As shown in FIG. 1B, the scintillator block 3 a and the photomultiplier 3 b are arranged in a ring shape so as to surround the body axis Z of the subject M, and are embedded in the gantry 2. The photomultiplier 3b is disposed outside the scintillator block 3a. As a specific arrangement of the scintillator block 3a, for example, two scintillator blocks 3a are arranged in a direction parallel to the body axis Z of the subject M, and many scintillator blocks 3a are arranged around the body axis Z of the subject M. Lined up forms are listed. The scintillator block 3a and the photomultiplier 3b constitute a γ-ray detector 3 for projection data (also referred to as “emission data”) to be described later.

  In this embodiment, a point source 4 and a γ-ray detector 5 for absorption correction data (transmission data) described later are provided. The γ-ray detector 5 for absorption correction data is composed of a scintillator block and a photomultiplier, like the γ-ray detector 3 for projection data. The dotted line source 4 is a radiation source for irradiating a radioactive drug to be administered to the subject M, that is, a radiation of the same kind as the radioisotope (RI) (in this embodiment, γ rays), and is disposed outside the subject M. Has been. In this embodiment, it is embedded in the gantry 2. The dotted line source 4 rotates around the body axis Z of the subject M. The dotted line source 4 corresponds to the radiation source in the present invention.

  In addition, the apparatus of the present embodiment includes a top plate driving unit 6, a controller 7, an input unit 8, an output unit 9, a projection data deriving unit 10, an absorption correction data deriving unit 11, a part determining unit 12, and an absorption correcting unit 13. And a reconstruction unit 14. The top plate driving unit 6 is a mechanism for driving the top plate 1 so as to perform the above-described movement, and is configured by a motor or the like not shown.

  The controller 7 comprehensively controls each part constituting the apparatus of this embodiment. The controller 7 includes a central processing unit (CPU). In this embodiment, the controller 7 sets and changes the moving speed of the top board 1 by operating the top board driving section 6 based on the part of the subject M determined by the part determination unit 12 described later. The controller 7 corresponds to the data collection condition setting means in this invention.

  The input unit 8 sends data and commands input by the operator to the controller 7. The input unit 8 includes a pointing device represented by a mouse, a keyboard, a joystick, a trackball, a touch panel, and the like. The output unit 9 includes a display unit represented by a monitor, a printer, and the like.

  The projection data deriving unit 10, the absorption correction data deriving unit 11, the part determining unit 12, the absorption correcting unit 13, and the reconstruction unit 14 are stored in a storage medium (not shown) including a ROM (Read-only Memory). This is realized by the controller 7 executing the input program or the instruction input by the input unit 8 and writes the data processed by these to a storage medium (not shown) represented by RAM (Random-Access Memory) or the like. And read from the storage medium as necessary.

  The γ-rays generated from the subject M to which the radiopharmaceutical is administered are converted into light by the scintillator block 3a, and the converted light is photoelectrically converted by the photomultiplier 3b and output to an electrical signal. The electric signal is sent to the projection data deriving unit 10 as image information (pixel).

  Specifically, when a radiopharmaceutical is administered to the subject M, two γ rays are generated due to the disappearance of the positron of the positron emission type RI. The projection data deriving unit 10 checks the position of the scintillator block 3a and the incident timing of the γ-ray, and sends it only when γ-rays are simultaneously incident on the two scintillator blocks 3a that are opposed to each other across the subject M. The obtained image information is determined as appropriate data. When γ-rays enter only one of the scintillator blocks 3a, the projection data deriving unit 10 treats them as noise instead of γ-rays generated by annihilation of the positron, and determines that the image information sent at that time is also noise. Reject.

  The image information sent to the projection data deriving unit 10 is sent to the absorption correction unit 13 as projection data. Absorption correction data (transmission data) sent from the absorption correction data deriving unit 11 to the absorption correction unit 13 is applied to the projection data sent to the absorption correction unit 13 to absorb γ rays in the body of the subject M. The projection data is corrected in consideration of the above.

  The point source 4 emits γ rays toward the subject M while rotating around the body axis Z of the subject M, and the irradiated γ rays are used as a scintillator block of the γ ray detector 5 for absorption correction data. (Not shown) converts it into light, and the converted light is photoelectrically converted by a photomultiplier (not shown) of the γ-ray detector 5 and output to an electrical signal. The electrical signal is sent as image information (pixels) to the absorption correction data deriving unit 11 and also sent to the part determination unit 12.

  Absorption correction data is obtained based on the image information sent to the absorption correction data deriving unit 11. The absorption correction data deriving unit 11 uses the calculation representing the relationship between the absorption coefficient of γ-rays or X-rays and the energy, thereby calculating the projection data for CT, that is, the distribution data of the X-ray absorption coefficient, of the γ-ray absorption coefficient. By converting to distribution data, the distribution data of the γ-ray absorption coefficient is obtained as absorption correction data. The derived absorption correction data is sent to the absorption correction unit 13 described above.

  The part of the subject M is determined based on the image information sent to the part determination unit 12. A specific determination method in this embodiment will be described later with reference to the explanatory diagram of FIG. 2 and the flowchart of FIG. Part determination unit 12 corresponds to part determination means in the present invention.

  The corrected projection data is sent to the reconstruction unit 14. The reconstruction unit 14 reconstructs the projection data to obtain a tomographic image taking into account the absorption of γ rays in the body of the subject M. Thus, by providing the absorption correction unit 13 and the reconstruction unit 14, the projection data is corrected based on the absorption correction data, and the tomographic image is corrected. The corrected tomographic image is sent to the output unit 9 via the controller 7.

  Next, the part determination method in the apparatus of the present embodiment will be described with reference to the explanatory diagram of FIG. 2 and the flowchart of FIG. FIG. 2 is an explanatory diagram of a profile of absorption correction data, and FIG. 3 is a flowchart showing a series of flows when determining a foot.

(Step S1) Profile Peak Detection The profile when image information (in FIG. 2, the output of the γ-ray detector related to absorption correction data) is the vertical axis and the channel direction of the γ-ray detector is the horizontal axis is shown in FIG. As shown in FIG. 2A shows a profile related to the vicinity of the abdomen, and FIG. 2B shows a profile related to the foot. The part determination unit 12 detects the peak of this profile. In the case of FIG. 2 (a), a peak is detected at the detector center C, and in the case of FIG. 2 (b), there is no peak at the detector center C, and the detector center is in the channel direction. Two peaks are detected at locations away from C, respectively.

(Step S2) Are there two peaks?
If the two peaks are not detected, it is determined that the foot is not a foot as shown in FIG. Conversely, if two peaks are detected, the process proceeds to step S3.

(Step S3) Is there a drop between the two peaks?
If there is no drop as shown in FIG. 2B between the two peaks, it is determined that the foot is not a foot as shown in FIG. Conversely, if there is a drop between the two peaks, the process proceeds to step S4. For example, if the threshold value is set in advance and the difference between the peak value and the value to be dropped is equal to or greater than the threshold value, the value to be dropped is a drop. judge.

(Step S4) Is between the two peaks near the detector center?
If the interval between the two peaks is not near the detector center C as shown in FIG. 2 (b), the process proceeds to step S6 because it is not a foot as shown in FIG. 2 (b). Conversely, if the interval between the two peaks is near the detector center C, the process proceeds to step S5. For example, the threshold value is set in advance, and the difference between the position coordinate in the channel direction between the two peaks and the position coordinate of the detector center C is set as the threshold value. If it is above, it will be determined that the two peaks are separated from the detector center C, and if it is less than the threshold value, it will be determined that the two peaks are near the detector center C.

(Step S5) Foot and determination Two peaks are detected in step S2, and there is a drop between the two peaks in step S3, and between the two peaks in the vicinity of the detector center C in step S4. For example, as shown in FIG. 2 (b), the part determination unit 12 determines that it is a foot.

(Step S6) It is determined that it is not a foot part If there is at least one case that does not correspond to each step of Steps S2 to S4, for example, as shown in FIG. 12 determines.

  After performing such a series of determinations, the determination result by the part determination unit 12 is sent to the top board drive unit 6 via the controller 7. When the part determination part 12 determines with a foot | leg part, the controller 7 operates the top-plate drive part 6, and performs control which makes the moving speed of the top-plate 1 faster. When the site determination unit 12 determines that it is not a foot (for example, near the abdomen), the controller 7 operates the top plate drive unit 6 to control the movement speed of the top plate 1 to be slow. The moving speed of the top board 1 is not particularly limited, and may be set and changed as appropriate. For example, the moving speed of the top board 1 is set to twice the moving speed of the top board 1 other than the feet. Set.

  According to the apparatus of the present embodiment having the above-described configuration, the form information (absorption) of the point source 4 outside the subject M is obtained from the gamma rays irradiated from the point source 4 and transmitted through the subject M. Based on the correction data), the part determination unit 12 determines that the part of the subject M is a foot / not a foot. Using the absorption correction data having this form information, it is possible to easily determine that the part of the subject M is a foot / not a foot.

  In the present embodiment, the controller 7 sets and changes the data collection condition based on the part of the subject M, so that the degree of collection of the data collection condition is lowered at the foot part which is a less important part. Data can be collected efficiently by increasing the degree of collection of data collection conditions except for a foot that is a high part.

  In the present embodiment, based on the part of the subject M, the foot that is a less important part has a higher moving speed of the top board 1 to lower the collection degree, and the foot that is a more important part. In other cases, the moving speed of the top plate 1 is slowed to increase the degree of collection, thereby efficiently collecting data.

  The present invention is not limited to the above-described embodiment, and can be modified as follows.

  (1) In the above-described embodiments, the PET apparatus has been described as an example. However, the present invention is a SPECT (Single Photon Emission CT) apparatus that reconstructs a tomographic image of a subject by detecting a single γ-ray. It can also be applied.

  (2) In the above-described embodiment, the projection data γ-ray detector 3 composed of the scintillator block 3a and the photomultiplier 3b is a stationary type that detects γ rays while still, but the scintillator block 3a In addition, the photomultiplier 3b may be a rotary type that detects γ rays while rotating around the subject M.

  (3) In the above-described embodiment, the PET apparatus includes the point source 4, and the point source 4 is irradiated with the same γ rays as the radiopharmaceutical and passes through the subject M, thereby absorbing as morphological information based on the radiation. Although correction | amendment data was calculated | required, about the radiation source represented by the dotted line source 4, and form information, it is not limited to this. For example, as shown in FIG. 4, the present invention may be applied to a PET-CT diagnostic system including a PET apparatus and an X-ray CT apparatus.

  The X-ray CT apparatus includes a gantry 21 having an opening 21 a, an X-ray tube 22, and an X-ray detector 23. The X-ray tube 22 and the X-ray detector 23 are disposed to face each other with the subject M interposed therebetween, and are embedded in the gantry 21. A large number of detection elements constituting the X-ray detector 3 are arranged in a fan shape around the body axis Z of the subject M.

  In addition, the X-ray CT apparatus includes a gantry driving unit 24, a high voltage generation unit 25, a collimator driving unit 26, and a CT reconstruction unit 27. The CT reconstruction unit 27 is realized by the controller 7 executing a program stored in a storage medium (not shown) such as a ROM (Read-only Memory) or an instruction input from the input unit 8, The data processed in these manners is written and stored in a storage medium (not shown) represented by a RAM (Random-Access Memory) or the like, and is read from the storage medium as necessary.

  The gantry driving unit 24 is a mechanism that drives the X-ray tube 22 and the X-ray tube detector 23 to rotate around the body axis Z of the subject M within the gantry 21 while maintaining the facing relationship with each other. The motor is composed of a motor (not shown).

  The high voltage generator 25 generates a tube voltage or tube current of the X-ray tube 22. The collimator driving unit 26 is a mechanism for setting an X-ray irradiation field and driving the collimator (not shown) in the vicinity of the X-ray tube 22 to move in the horizontal direction. It consists of

  In the case of the indirect conversion type X-ray detector 23, the X-ray irradiated from the X-ray tube 22 and transmitted through the subject M is converted into light by a scintillator (not shown) in the X-ray detector 23. The light-sensitive film (not shown) photoelectrically converts the converted light and outputs it as an electrical signal. In the case of the direct conversion type X-ray detector 23, the X-ray is directly converted into an electric signal by a radiation sensitive film (not shown) and output. The electric signal is sent to the CT reconstruction unit 27 as image information (pixel). Image information sent to the CT reconstruction unit 27 is transmitted as projection data for CT.

  The projection data for CT has the form information in the same way as the absorption correction data described in the embodiment. In this modification, the absorption correction data deriving unit is used to use the CT projection data as the absorption correction data. 11 and the part determination unit 12 as well. Accordingly, the radiation source that is the basis of the morphological information is the X-ray tube 22 in this modification, whereas the radiation source is the point source 4 in the above-described embodiment. That is, in this modification, the X-ray tube 22 corresponds to the radiation source in the present invention.

  Image information (CT projection data) sent to the CT reconstruction unit 27 is reconstructed to obtain a CT tomographic image. This CT tomographic image is sent to the output unit 9 via the controller 7.

  The functions of the subsequent processing units (the absorption correction unit 13 and the reconstruction unit 14) including the absorption correction data deriving unit 11 are the same as those in the embodiment, and the description thereof is omitted. Note that the PET tomographic image reconstructed by the reconstruction unit 14 and the CT tomographic image reconstructed by the CT reconstruction unit 27 may be superimposed and output by the output unit.

  According to this modification, in the X-ray CT apparatus, the projection data for CT is obtained based on the X-rays irradiated from the outside of the subject M and transmitted through the subject M, and the projection data is reconstructed to obtain the subject. Using X-rays used when obtaining a CT tomographic image of the specimen M, morphological information is obtained based on the X-rays. And the site | part of the subject M is determined using this form information.

  (4) In the above-described embodiment, the movement speed of the top 1 on which the subject M is placed has been described as an example of the data collection condition. The moving speed of the plate 1 is not limited. For example, when scanning is performed while the top plate 1 is repeatedly moved and stopped, the stationary time of the top plate 1 is shortened to reduce the degree of collection at a less important part, and the top part 1 is used at a higher importance part. The collection time may be increased by lengthening the stationary time of the plate 1.

  (5) In the above-described embodiment, the data collection condition relating to the collection of the diagnostic data is changed based on the part of the subject M determined by the part determination unit (part determination unit 12) in the present invention. The purpose of using the M part is not limited to changing the setting of data collection conditions. For example, the determined part of the subject M may be output to the output unit 9.

  (6) In the above-described embodiment, the foot is determined to be a less important part, and the abdomen and the head other than the foot are determined to be a highly important part with the foot and the other part, If the data collection conditions are changed, but data collection of only the head is necessary depending on the case and data collection of other parts is not important, the determination may be made by the head and other parts.

(A) is a side view and block diagram of a PET (Positron Emission Tomography) apparatus according to the embodiment, and (b) is an enlarged view showing a specific configuration of a γ-ray detector. It is explanatory drawing of the profile of absorption correction data, (a) is a profile regarding abdominal region vicinity, (b) is a profile regarding a foot | leg part. It is the flowchart which showed a series of flows when determining a foot | leg part. It is the side view and block diagram of the diagnostic system of PET-CT provided with the PET apparatus and X-ray CT apparatus which concern on a modification.

Explanation of symbols

4 ... Point source 7 ... Controller 12 ... Site determination unit M ... Subject

Claims (6)

Projection data is obtained based on radiation generated from a subject to which a radiopharmaceutical is administered, and the projection data is reconstructed to obtain a tomographic image for nuclear medicine of the subject. A nuclear medicine diagnostic apparatus for obtaining morphological information based on radiation irradiated from the radiation source and transmitted through the subject, wherein the part judgment means for judging a part of the subject based on the morphological information; and the part judgment A nuclear medicine diagnosis apparatus comprising: a data collection condition setting unit configured to change a data collection condition relating to the collection of the projection data based on a part of the subject determined by the unit. 2. The nuclear medicine diagnosis apparatus according to claim 1, wherein it is determined whether or not the part of the subject determined by the part determination means is a foot. 3. The nuclear medicine diagnosis apparatus according to claim 1, wherein the site determination unit detects two peaks in the profile of the morphological information, and there is a drop between the two peaks, and two peak peaks are detected. If the interval is near the center of the detector, it is determined that the determination target part from which the morphological information is obtained is a foot part, and the data collection means is based on the determined part of the subject being a foot part. Te, nuclear medicine diagnostic apparatus characterized by setting change the data collection condition.   4. The nuclear medicine diagnosis apparatus according to claim 1, wherein the data collection condition is a moving speed of a top plate on which the subject is placed, and the data collection condition setting unit includes the subject. A nuclear medicine diagnostic apparatus characterized in that the moving speed of the top plate is set and changed based on a part of a specimen.   The nuclear medicine diagnosis apparatus according to any one of claims 1 to 4, wherein the apparatus includes the radiation source, and the radiation source emits the same radiation as the radiopharmaceutical. .   Projection data is obtained based on the nuclear medicine diagnosis apparatus according to any one of claims 1 to 5 and X-rays irradiated from an X-ray tube and transmitted through a subject, and the projection data is reconstructed to obtain a subject. An X-ray CT apparatus for obtaining a tomographic image for X-ray CT of a specimen, wherein the nuclear medicine diagnostic apparatus obtains morphological information based on X-rays used in the X-ray CT apparatus, A diagnostic system characterized in that the determination means determines a region of the subject based on the form information.

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