JP4346286B2 - Nuclear medicine diagnostic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nuclear medicine diagnostic apparatus having a plurality of detectors for detecting radiation emitted from a radioisotope administered to a subject.
[0002]
[Prior art]
Conventionally, a drug labeled with a radioisotope (hereinafter referred to as RI) is administered into a subject, and the distribution of RI within the subject is detected based on the result of detecting gamma rays emitted from the RI. A nuclear medicine diagnostic apparatus for imaging a state is provided. In particular, in order to obtain the image as a predetermined tomographic image, a gamma camera (a camera that detects a gamma ray and images a two-dimensional distribution of RI) is used as a detector, and this is used with the body axis of the subject as an axis. An apparatus that performs imaging by rotating 360 degrees, a so-called SPECT (Single Photon Emission Computed Tomography) apparatus, and the like are widely known.
[0003]
The gamma cameras described above include those using a scintillator as a detecting element and those using a semiconductor (CdTe, CZT, etc.). Among these, a detector using a semiconductor as a detection element (hereinafter referred to as a semiconductor detector) has an advantage that the detection head can be configured to be small (thin) and lightweight.
[0004]
[Problems to be solved by the invention]
However, semiconductors are very expensive, and due to their manufacturing reasons, they generally have the disadvantage that the detection area of a semiconductor detector is small and the detection field of view is also small.
[0005]
For this reason, some conventional nuclear medicine diagnostic apparatuses include a plurality of semiconductor detectors that can increase the detection visual field. Such a nuclear medicine diagnostic apparatus is described in, for example, Japanese Patent Application Laid-Open No. 11-21833.
[0006]
However, in such a nuclear medicine diagnostic apparatus, the efficiency of the examination greatly depends on the position of the plurality of detectors with respect to the subject and how the gamma rays are detected while moving the detectors. Therefore, in order to perform an efficient inspection, it becomes necessary to appropriately perform these according to the type of inspection.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to detect gamma rays while efficiently arranging and moving the plurality of detectors in a nuclear medicine diagnostic apparatus having a plurality of detectors. It is to provide a nuclear medicine diagnostic apparatus that can shorten the data collection time and greatly improve the examination efficiency.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 Attached to the inner surface of the rotating ring, Radiation detection means having a plurality of detectors for detecting radiation emitted from a radioisotope administered to a subject, and image creation means for creating an image from projection data based on detection results from the radiation detection means. In the nuclear medicine diagnosis apparatus, the radiation detection means includes support means capable of arranging the plurality of detectors on the same plane and at mutually different positions with respect to the body axis direction of the subject. It is characterized by.
[0015]
In order to solve the above problems, the claims 2 The described invention is claimed. 1 The nuclear medicine diagnostic apparatus according to claim Biography The holding means divides the plurality of detectors into a first group disposed at a position for capturing the head of the subject and a second group disposed at a position for capturing both shoulders of the subject. It is characterized by arranging.
[0016]
In order to solve the above problems, the claims 3 The described invention is claimed. 1 A nuclear medicine diagnostic apparatus according to claim 1, The supporting means divides the plurality of detectors into a first group arranged at a position for capturing the head of the subject and a second group arranged at a position for capturing the toe portion of the subject. And place The radiation detection means starts detection of the radiation when the first group is at a position where the head of the subject is captured, and when the second group comes to a position where the tip of the subject is captured The detection of the radiation is terminated.
[0017]
In order to solve the above problems, the claims 4 The described invention is claimed. 1 A nuclear medicine diagnostic apparatus according to claim 1, A moving means for moving the radiation detecting means relative to the subject along the body axis direction of the subject; The moving means moves the plurality of detectors within a range where the measurement object of the subject is captured.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a nuclear medicine diagnosis apparatus according to the present invention will be described in detail with reference to the drawings.
[0024]
[Configuration of nuclear medicine diagnostic equipment]
(Machine configuration)
In FIG. 1, the perspective view showing the whole structure of the nuclear medicine diagnostic apparatus in this embodiment is shown. As shown in the figure, the nuclear medicine diagnostic apparatus mainly includes a bed 1 on which a subject P is placed, a gantry 2 that supports detectors 21a to 21c, and an operation console 3.
[0025]
The bed 1 includes a top plate 11 on which the subject P is placed, and support portions 12 and 13 that support the top plate 11 at both ends thereof. The support parts 12 and 13 move up and down freely along the vertical direction V by performing expansion and contraction operations in synchronization with each other by a driving unit (not shown).
[0026]
The gantry 2 includes a fixed base 24 placed on the floor rail 4, a rotating ring 23 that is rotatably fitted to the fixed base 24, and three support portions 22 a that are attached to the inner surface of the rotating ring 23. To 22c, and three detectors 21a to 21c supported by the support portions 22a to 22c, respectively. Each of the detectors 21a to 21c includes a collimator (not shown) that limits the incident direction of the gamma rays emitted from the RI administered to the subject, the detection unit 20 that converts the incident gamma rays into electrical signals, And a data collection system (DAS) (not shown) for collecting electrical signals. The detection unit 20 includes a plurality of semiconductor detection elements such as CdTe or CdZnTe arranged in a two-dimensional array, and has a size of about 220 mm × 180 mm. The collimator is provided on the front surface where gamma rays are incident on the detector 20 of this array structure, and the detected gamma rays are limited to a specific direction. By configuring the detection unit 20 with the semiconductor detection element array structure in this manner, an overwhelming reduction in size and weight can be realized as compared with a conventional anger type detector.
[0027]
In such a configuration, each of the detectors 21 a to 21 c detects radiation radiated from the subject P placed on the top plate 11 of the bed 1, that is, gamma rays.
[0028]
The support portions 22a to 22c can move the plurality of detectors 21a to 21c within a predetermined range along the body axis Z direction of the subject P, respectively, and the inner surface of the rotating ring 23 in the circumferential direction D. The inside of the rotating ring 23 is supported so as to be movable within a predetermined range along the direction toward the circle center of the rotating ring 23, and the detection direction of the detection unit 20 is adjustable. In addition, the detailed structure regarding the detectors 21a-21c and the support parts 22a-22c is mentioned later.
[0029]
The rotating ring 23 supports the detectors 21a to 21c and the support portions 22a to 22c, respectively, and rotates itself along the circumferential direction D by a driving unit (not shown) so that the body axis of the subject P is obtained. Rotate around Z. The rotating ring 23 corresponds to the “rotary moving means” of the present invention.
[0030]
The fixed base 24 supports the detectors 21a to 21c, the support portions 22a to 22c, and the rotating ring 23, and moves itself on the floor rail 4 along the horizontal direction H by a driving unit (not shown). The subject P is translated along the body axis Z direction. The fixed base 24 corresponds to the “moving means” of the present invention.
[0031]
The operation console 3 performs a moving operation related to the support portions 12 and 13 of the bed 1 and the rotating ring 23 and the fixed table 24 of the gantry 2, and more specifically, drive control related to the driving means (not shown) provided on each of them. The operation panel 31, the display monitor 32 that displays an image relating to the subject P, and the mouse 33 for performing various setting operations on the setting screen displayed on the display monitor 32.
[0032]
In such a configuration, the operator raises and lowers the support parts 12 and 13 by operating the operation panel 31, and the measurement object (not shown) of the subject P placed on the top plate 11 of the bed 1. Detection in which the position is made substantially coincident with the rotation axis of the rotating ring 23 of the gantry 2 and a predetermined radioisotope is administered to the subject P, and gamma rays radiated from the radioisotope are arranged at a predetermined position. It detects with the instruments 21a-21c. It should be noted that the detectors 21a to 21c are each fixed at a predetermined position according to the type of examination, or when translated in the body axis Z direction of the subject P, the body axis of the subject P. In the case of rotational movement around Z, there are other cases where it is rotationally moved around the body axis Z of the subject P while being translated along the body axis Z direction of the subject P. A specific example of the arrangement positions of the detectors 21a to 21c and the type of inspection will be described later. Incidentally, exchange of signals, power supply, and the like between the fixed base 24 that is a fixed system and the rotating ring 23 that is a rotating system is performed via a slip ring. At this time, for example, a contactless optical signal transmission system can be adopted for the transmission / reception of signals.
[0033]
2 and 3 show detailed configurations of the detector 21a and the support portion 22a. However, since the detectors 21a to 21c and the support portions 22a to 22c have the same configuration, only the detector 21a and the support portion 22a will be described below.
[0034]
As shown in FIG. 2, the detector 21a is supported by the rotation mechanism 220a of the support 22a so that the detection direction of the detector 20a can be adjusted (direction (1) in FIG. 2). In addition, the expansion / contraction mechanism 221a of the support portion 22a supports the inner surface of the rotary ring 23 so as to be movable within a predetermined range, that is, within a predetermined stroke along the direction toward the center of the circle (direction (2) in the figure). Has been. Further, the inner surface of the rotating ring 23 is supported so as to be movable along the circumferential direction D by the moving mechanism portion 222a of the support portion 22a. The moving mechanism 222 a is configured to be freely movable by fitting the protrusion into the rotating rail 230 a of the rotating ring 23. Furthermore, as shown in FIG. 3, the detector 21a is supported by the slide mechanism portion 223a of the support portion 22a so as to be movable within a predetermined range, that is, within a predetermined stroke, along the body axis Z direction of the subject P. ing. Each of these mechanism parts (rotating mechanism part 220a, expansion / contraction mechanism part 221a, moving mechanism part 222a, and slide mechanism part 223a) is provided with a fixture (not shown), and the detector 21a (detecting part 20a) is provided in a desired manner. It can be fixed in a desired direction.
[0035]
The rotation mechanism 220a corresponds to the “rotation support unit” of the present invention. The expansion / contraction mechanism 221a corresponds to the “expansion / contraction support means” of the present invention. The moving mechanism 222a corresponds to the “moving support means” of the present invention. The slide mechanism 223a corresponds to the “slide support means” of the present invention.
[0036]
As described above, the configurations of the detector 21a and the support portion 22a described above are the same for the other detectors 21b and 21c and the support portions 22b and 22c. That is, the detectors 21a to 21c (detectors 20a to 20c) can be fixed at desired positions and in desired directions by the support portions 22a to 22c, respectively.
[0037]
By adopting such a configuration, in the nuclear medicine diagnosis apparatus according to this embodiment, for example, as shown in FIGS. 4 to 9, the detectors 21 a to 21 c are arranged at positions adjacent to each other in the rotary ring 23. The detectors 20a to 20c are aligned on the same plane, and are arranged at positions offset with respect to the body axis Z direction of the subject P (see FIGS. 4 and 5). 4 is a front view, and FIG. 5 is a plan view.) Further, the detectors 21a to 21c are arranged at positions separated from each other in the rotating ring 23, and each of the objects P is a specimen P. A configuration (see FIGS. 6 and 7; however, FIG. 6 is a front view and FIG. 7 is a plan view) that is arranged at the same position in the body axis Z direction, and detector 21a. And 21b are adjacent to each other in the rotating ring 23. The detector 21c is arranged at a position in the rotary ring 23 at a position apart from these, and each is arranged at the same position in the body axis Z direction of the subject P (FIG. 8 and 9 (however, FIG. 8 is a front view and FIG. 9 is a plan view). These forms will be described later together with the types of inspection corresponding to each of these forms.
[0038]
(Control configuration)
FIG. 10 is a block diagram showing the hardware configuration of the nuclear medicine diagnostic apparatus. However, the block diagram shown in this figure shows only the part related to the image creation processing of the nuclear medicine diagnosis apparatus.
[0039]
As shown in the figure, the nuclear medicine diagnosis apparatus mainly includes a CPU 100 that controls each unit, the display monitor 32 that is an image display unit related to the subject P, and an interface between the display monitor 32 and the CPU 100. A display interface 200, a memory 300 as a storage means for primary projection data, a disk unit 400 as a storage means for images, etc., a disk interface 500 as an interface between the disk unit 400 and the CPU 100, An image processor 600 that is an image creation means for performing various image processing (joining processing, reconstruction processing, etc.), the detectors 21a to 21c that are radiation detection means, and detectors 21a to 21c (more specifically, detection) Part 20 and a data collection system (DAS). When a data interface 700 is an interface with the CPU 100, other, constituted by the mouse 33 or the like as input means.
[0040]
In such a configuration, gamma rays emitted from the subject P are detected by the detectors 21a to 21c, converted into electrical signals, collected by a data acquisition system (DAS), and used as projection data in the data interface 700. Is transmitted to the memory 300 through the memory and temporarily stored in the memory 300. The image processor 600 performs image joining processing, reconstruction processing, and the like based on the projection data accumulated in the memory 300. At this time, the images connected in the image processor 600, the reconstructed images, and the like are stored in the disk unit 400. The disk unit 400 stores predetermined operation programs that can be selectively used by the operator in accordance with each examination, and these programs are read out by operating the mouse 33 and the like. Calculations are performed according to the contents of the program, and detection directions and detection positions of the detectors 21a to 21c when acquiring projection data are set. An image created by the image processor 600 is displayed on the display monitor 32 via the display interface 200.
[0041]
The CPU 100, the display interface 200, the memory 300, the disk unit 400, the disk interface 500, the image processor 600, the data interface 700, and the like described above are usually integrated as one computer system.
[0042]
[Image creation method]
Next, regarding the image creation method of the nuclear medicine diagnosis apparatus configured as described above, that is, the data collection method (the arrangement positions of the detectors 21a to 21c and their movement methods), various tests, specifically, Each case of performing whole body collection, myocardial SPECT, and general-purpose SPECT will be described as an example.
[0043]
However, regardless of which inspection is performed, the detectors 21a to 21c are arranged at positions that complement each other's detection visual field in the direction substantially orthogonal to the body axis direction of the subject P. Complementing the mutual detection visual fields corresponds to “complement” of the present invention.
[0044]
First, in common with each examination, the operator places the subject P on the top 11 of the bed 1 and operates the operation panel 31 of the operation console 3 to support the support parts 12 and 13 of the bed 1. Is moved up and down so that the position of the measurement object (not shown) of the subject P placed on the top plate 11 is substantially coincided with the rotation axis of the rotation ring 23 of the gantry 2, and a predetermined radioisotope is obtained. The element is administered to the subject P. And the gamma rays radiated | emitted from this radioisotope are detected by the detectors 21a-21c previously arrange | positioned in the predetermined position according to various test | inspections so that it may demonstrate below. The description is continued below.
[0045]
A: When collecting whole body
The whole body of the subject P is a measurement target in the whole body collection. Therefore, in the nuclear medicine diagnostic apparatus, first, as shown in FIGS. 4, 5, and 11, one of the three detectors 21 a to 21 c, for example, the detector 21 c is positioned above the head of the subject P. Placed in ( " This corresponds to the “first group”. ) The remaining two detectors 21a and 21b are respectively arranged above the shoulders of the subject P ( " This corresponds to “second group”. In addition, the detection units 20a to 20c of the detection units 20a to 20c are made to coincide with each other on the same plane, and the fixed base 24 is held along the floor rail 4 with respect to the body axis Z of the subject P while holding them. By moving in parallel, the whole body of the subject P is covered by the three detectors 21a to 21c, and gamma rays are detected, that is, data of projection data is collected. At this time, the data collection ranges of the detectors 21a and 21b and the detector 21c are preferably provided with overlapping portions (shaded portions in the figure) as shown in FIG. By providing such a portion, when image joining processing and reconstruction processing are performed later in the image processor 600, these can be appropriately performed. This is because there is no missing data range. As a matter of course, the operator moves the fixed base 24 in parallel with the body axis Z of the subject P along the floor rail 4 by operating the operation panel 31 of the operation console 3.
[0046]
It should be noted that in the nuclear medicine diagnostic apparatus, when the whole body collection is performed, the movement distances of the detectors 21a to 21c are the movement distance L as shown in FIG. As shown in the figure, in a conventional nuclear medicine diagnosis apparatus, for example, one having a relatively large detector 21 ', when the whole body collection is performed, the movement distance of the detector 21' Since the distance from the head of the specimen P to the foot, that is, the movement distance L ′, the nuclear medicine diagnosis apparatus can shorten the movement distance of the detectors (21 a to 21 c) by L′−L. . Therefore, the data collection time can be shortened and the inspection efficiency can be improved.
[0047]
B: When performing myocardial SPECT
The measurement target in the myocardial SPECT is the peripheral portion of the heart of the subject P. In the myocardial SPECT, in order to obtain a tomographic image of the peripheral part of the heart of the subject P, the detectors 21a to 21c each collect data while rotating around the body axis of the subject P. become. Therefore, in the nuclear medicine diagnostic apparatus, first, as shown in FIGS. 6, 7 and 12, two of the three detectors 21 a to 21 c, for example, the detectors 21 b and 21 c are connected to the heart of the subject P. The remaining one at a position facing Q across the Q, the detector 21a in a position covering the heart Q of the subject P and its periphery, and the other detectors 21b and 21c together with a substantially U-shape By arranging the drawing ring and rotating the rotary ring 23 while maintaining these positions, the heart part Q and its peripheral part of the subject P are covered by the three detectors 21a to 21c, and the data is covered. Collect. Incidentally, O shown in FIG. 12 is the rotation center of the detectors 21a to 21c. As a matter of course, the operator rotates the rotating ring 23 in the circumferential direction D by operating the operation panel 31 of the operation console 3.
[0048]
It should be noted here that in the nuclear medicine diagnostic apparatus, the data collection ranges of the detectors 21a to 21c are Ra, Rb, and Rc shown in FIG. 12, respectively. That is, in the range of 180 degrees on the myocardial side where the heart Q is an important range for image reconstruction processing, there are always two detectors (any one of the detectors 21a to 21c). In the range of 180 degrees on the opposite side of the myocardium (the range far from the heart Q and where the top plate 11 becomes an obstacle), which is the range used for distortion correction when performing the image reconstruction process while obtaining projection data Can obtain projection data for one detector (detector 21b or detector 21c), which is the minimum necessary. In a conventional nuclear medicine diagnosis apparatus, for example, one having three detectors as in the case of the nuclear medicine diagnosis apparatus, when performing myocardial SPECT, the detectors 21a to 21c usually arranged in a substantially U-shape are used. Since the rotation angle was 360 degrees, the projection data was not obtained more than necessary, and the data collection time was long and the inspection efficiency was poor. In addition, in a conventional nuclear medicine diagnosis apparatus, for example, one having two detectors, when performing myocardial SPECT, usually, two detectors are arranged in a substantially L shape and rotated 90 degrees. Data collection time is short, so the data collection time is short, but only the minimum projection data necessary for image reconstruction is obtained, and projection data used for distortion correction is not obtained. There may be a problem with the image quality of the reconstructed image. As described above, in the nuclear medicine diagnosis apparatus, the detector arranged in a substantially U-shape is rotated by 180 degrees which is the minimum necessary, and in the range of 180 degrees on the myocardial side where the heart Q is important, Projection data for two detectors is obtained, and in the range of 180 degrees on the opposite side used for distortion correction, projection data for one detector, which is the minimum necessary, can be obtained, so the data collection time is shortened. At the same time, a good image with distortion correction can be obtained. Therefore, inspection efficiency can be improved and inspection can be supported appropriately.
[0049]
C: When performing general-purpose SPECT
An object to be measured in the general-purpose SPECT is an arbitrary part of the subject P. However, in the present invention, the one having a size that cannot be collected by only one detector is a measurement target for general-purpose SPECT. Also in the general-purpose SPECT, in order to obtain a tomographic image of the measurement object Q of the subject P, the detectors 21a to 21c each collect data while rotating around the body axis of the subject P. . As described above, the sizes of the detectors 20a to 20c of the detectors 21a to 21c, that is, the detection ranges are about 220 mm × 180 mm, respectively. For example, when the measurement object is a lung or the like, Of course, it is impossible to collect data with only one detector. Therefore, in the nuclear medicine diagnosis apparatus, as shown in FIGS. 8, 9, and 13, first, two of the three detectors 21a to 21c, for example, the detectors 21a and 21c are arranged at adjacent positions. ( " This corresponds to the “first group”. ) To cover the entire measurement object Q ′ of the subject P using these, and the remaining one detector 21b is arranged at a position away from the detectors 21a and 21c ( " This corresponds to “second group”. ), The measurement object Q ′ of the subject P and the periphery thereof are covered using this, and the rotation ring 23 is rotated 360 degrees while holding the measurement object Q ′ and the periphery thereof, so that the measurement object Q ′ of the subject P is measured. Collect the entire data. Incidentally, O shown in FIG. 13 is the rotation center of the detectors 21a to 21c. As a matter of course, the operator rotates the rotating ring 23 in the circumferential direction D by operating the operation panel 31 of the operation console 3. If necessary, the fixed base 24 is moved in the body axis Z direction of the subject P along the floor rail 4 in synchronism with this.
[0050]
It should be noted here that in the nuclear medicine diagnosis apparatus, a plurality of detectors 21a to 21c (detectors 21a and 21b) are used so as to cover each other's detection field of view, so that only one detector can be covered. Even in the case of a measurement object (Q ′) having an inadequate size, projection data can be obtained at a time. Furthermore, by using the remaining detector (detector 21b) to obtain projection data for distortion correction, a good image with distortion correction can be obtained. Therefore, inspection efficiency can be improved and inspection can be supported appropriately.
[0051]
In addition, when data is collected for the measurement object Q ′ having a size that cannot be covered by only one detector in this way, in addition to this, for example, as shown in FIG. Using two detectors A and B, these are arranged in a substantially L shape so as to compensate for the blind spot in the detection visual field of each other, and this is rotated 360 degrees. Further, as shown in FIG. There is a method of using two detectors A, B, and C and arranging them in a substantially triangular shape so as to compensate for the blind spots of the detection visual fields, and rotating them 360 degrees. In this case, data can be collected at a time even for the measurement object Q ″ (> Q ′) having a size that cannot be covered by the two detectors. Incidentally, O shown in the figure is the rotation center of the detectors A to C. All of these can be implemented in the nuclear medicine diagnostic apparatus by adjusting the number of detectors and the like.
[0052]
As described above, the projection data collected in each examination is commonly transmitted from the detectors 21a to 21c to the image processor 600 via the data interface 700, and the image processor 600 performs the processing on the projection data. Then, image joining processing and image reconstruction processing are performed. In the case of myocardial SPECT or general-purpose SPECT, the image processor 600 performs reconstruction processing while correcting image distortion.
[0053]
These image joining processing, image reconstruction processing, image distortion correction processing, and the like are performed by a known method similar to that of a conventional nuclear medicine diagnostic apparatus. For example, the image processor 600 performs an image reconstruction process by a successive approximation method. One typical method is the OS-EM method. The OS-EM method is a method in which projection data is divided into a plurality of groups and an approximate process is performed for each subset. The method of dividing this subset is arbitrary, but in a three-dimensional collection position, two data that form an angle of 90 degrees that is the most sparse (relevant) relationship can be used as one subset. This is a preferable condition for reconstructing a good image.
[0054]
In this way, the image subjected to the joining process and the reconstruction process in the image processor 600 is displayed on the display monitor 32 via the display interface 2.
[0055]
As described above, in the nuclear medicine diagnosis apparatus according to the present embodiment, a plurality of detectors are efficiently used in various tests, specifically, when performing whole body collection, myocardial SPECT, general-purpose SPECT, and the like. Since data collection is performed by arranging them and moving them within a necessary minimum range, data collection time can be shortened and inspection efficiency can be greatly improved. Further, by obtaining distortion correction projection data at the same time and performing image correction, a good image with distortion correction can be obtained. Therefore, it is possible to appropriately support the inspection. Further, by using a plurality of detectors so as to complement each other's detection field of view, even if the measurement object has a size that cannot be covered by only one detector, the projection data can be obtained at a time. Can be obtained and the inspection efficiency can be improved. Further, by using the remaining detectors to obtain projection data for distortion correction at the same time and performing image correction, a good image with distortion correction can be obtained. Therefore, it is possible to appropriately support the inspection.
[0056]
The nuclear medicine diagnosis apparatus according to the present invention is not limited to the nuclear medicine diagnosis apparatus in the present embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. For example, the configuration related to the support portions 22a to 22c of the nuclear medicine diagnosis apparatus according to the present embodiment, the configuration of the rotating ring 23 and the fixing base 24, and the floor rail 4 that support the same have the same functions. If it exists, it may take other forms. Moreover, the form which extracted these functions partially may be taken. The configuration of the operation panel 31, the display monitor 32, the mouse 33, and the like of the operation console 3 may take other forms as long as they have similar functions. Further, the same applies to the arrangement of detectors and the movement range in each inspection.
[0057]
【The invention's effect】
As described above, according to the nuclear medicine diagnostic apparatus according to the present invention, gamma rays can be detected while efficiently arranging and moving a plurality of detectors. Efficiency can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the overall configuration of a nuclear medicine diagnostic apparatus according to the present invention.
2 is a perspective view showing a detailed configuration related to a detector and a support part of the nuclear medicine diagnostic apparatus shown in FIG. 1;
3 is a perspective view showing a detailed configuration related to a detector and a support portion of the nuclear medicine diagnostic apparatus shown in FIG. 1. FIG.
4 is a front view showing an arrangement position of each detector when performing whole body collection in the nuclear medicine diagnostic apparatus shown in FIG. 1. FIG.
5 is a plan view showing an arrangement position of each detector when performing whole body collection in the nuclear medicine diagnostic apparatus shown in FIG. 1. FIG.
6 is a front view showing an arrangement position of each detector when performing myocardial SPECT in the nuclear medicine diagnosis apparatus shown in FIG. 1. FIG.
7 is a plan view showing an arrangement position of each detector when performing myocardial SPECT in the nuclear medicine diagnostic apparatus shown in FIG. 1. FIG.
8 is a front view showing an arrangement position of each detector when performing general-purpose SPECT in the nuclear medicine diagnosis apparatus shown in FIG. 1. FIG.
9 is a plan view showing an arrangement position of each detector when performing general-purpose SPECT in the nuclear medicine diagnostic apparatus shown in FIG.
10 is a block diagram showing a control configuration of the nuclear medicine diagnostic apparatus shown in FIG.
FIG. 11 is an explanatory diagram for explaining a moving distance of each detector when performing hole body collection;
FIG. 12 is an explanatory diagram for explaining a data collection range of each detector when performing myocardial SPECT.
FIG. 13 is an explanatory diagram for explaining an arrangement position of each detector when performing general-purpose SPECT.
FIG. 14 is an explanatory diagram for explaining another example regarding the arrangement position of each detector when performing the general-purpose SPECT shown in FIG. 13;
FIG. 15 is an explanatory diagram for explaining still another example regarding the arrangement position of each detector when performing the general-purpose SPECT shown in FIG. 13;
[Explanation of symbols]
1 ... Sleeper
11 ... top plate
12, 13 ... support part
2 ... Stand
20a to 20c ... detection unit
21 '... Detector
21a-21c ... Detector
22a-22c ... support part
220a-220c ... rotation mechanism part
221a to 221c ... telescopic mechanism
222a to 222c: moving mechanism unit
223a to 223c ... slide mechanism
23 ... Rotating ring
24 ... Fixing base
3. Operation console
31 ... Control panel
32 ... Display monitor
33 ... Mouse
4 ... Floor rail
100 ... CPU
200: Display interface
300 ... Memory
400: Disc unit
500 ... Disk interface
600: Image processor
700 ... Data interface
AC ... Detector
D ... Circumferential direction
H ... Horizontal direction
L, L '... Movement distance
O ... Center of rotation
P ... Subject
Q, Q ', Q "... Measurement object
Ra, Rb, Rc ... Data collection range
V ... Vertical direction
Z ... Subject axis

Claims (4)

A radiation detection means attached to the inner surface of the rotating ring and having a plurality of detectors for detecting radiation emitted from the radioisotope administered to the subject, and an image from projection data based on the detection result from the radiation detection means A nuclear medicine diagnostic apparatus comprising an image creating means for creating,
The nuclear medicine diagnosis apparatus, wherein the radiation detection means includes support means capable of arranging the plurality of detectors on the same plane and at mutually different positions with respect to the body axis direction of the subject. .   The support means divides the plurality of detectors into a first group disposed at a position for capturing the head of the subject and a second group disposed at a position for capturing both shoulders of the subject. The nuclear medicine diagnosis apparatus according to claim 1, wherein the nuclear medicine diagnosis apparatus is arranged. The support means divides the plurality of detectors into a first group arranged at a position for capturing the head of the subject and a second group arranged at a position for capturing the toe portion of the subject. And place
The radiation detection means starts detection of the radiation when the first group is at a position for capturing the head of the subject, and when the second group comes to a position for capturing the toe portion of the subject. The nuclear medicine diagnosis apparatus according to claim 1, wherein the detection of the radiation is terminated. A moving means for moving the radiation detecting means relative to the subject along the body axis direction of the subject;
The nuclear medicine diagnosis apparatus according to claim 1, wherein the moving unit moves the plurality of detectors within a range where the measurement target of the subject is captured.

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