JP2000180552A - Scintillation camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a clear image by reducing the increase in the absorption of γ rays at an auxiliary top mounting part when mounting the auxiliary top to a top for collecting a SPECT image as the top for collecting a whole body image. SOLUTION: A scintillation camera device is provided with detectors 1 and 4 that are arranged at a specific position for a subject on a top for a specimen and a stand 6 for supporting and rotating the detectors. The device collects a SPECDT image data by rotating the detectors around the specimen and moves the detectors in the direction of the body axis of the specimen for collecting a whole body image data. In the device, an auxiliary top 22 is fitted as a top for collecting whole body image by an insertion-type mounting part that can be mounted to and removed from the SPECT image collection top 11s and at the same time the mounting part of the auxiliary top 22 set to insertion engagement structure by a part that is bent upward and a part that is bent downward alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scintillation camera device, and more particularly, to a top plate for collecting SPECT images, to which an auxiliary top plate which is easily attached and detached is attached.
The present invention relates to a scintillation camera device provided with a top plate serving as a whole body image collection top plate.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a schematic configuration of a scintillation camera device, wherein 1 is a first detector, 4 is a second detector, 5a is a first collimator, 5b is a second collimator, 6 is a stand, 7 is collimator storage means, 8a is a first translation mechanism, 8b is a second translation mechanism,
9a is a first proximity movement mechanism, 9b is a second proximity movement mechanism, 10 is a lateral movement mechanism, 11 is a top plate for a subject, 10
1 is an operation console, 102a is a first top support, 103 is a monitor, X, Y, Z, and W are X, respectively.
Axis, the Y axis, the Z axis, and the W axis.

In FIG. 5, a first detector 1 and a second detector 4 detect radiation particles (generally gamma rays) emitted from a radioisotope administered to a subject (not shown). The device shown is of the two-detector type having a first detector 1 and a second detector 4. The first collimator 5a and the second collimator 5b are collimators arranged on the input surface (detection surface) side of the first detector 1 and the second detector 4, respectively.

[0004] The stand 6 includes first and second detectors 1 and 2.
4 is a well-known stand that rotatably supports the object table 4 around the subject table 11, and, together with the detector, includes first and second parallel movement mechanisms 8a and 8b, and first and second proximity movement mechanisms 9a and 9a. 9b is rotatably supported, and a lateral movement mechanism 10 is provided.

[0005] First and second translation mechanism 8a, 8b
Is a moving mechanism for aligning the positions of the detectors 1 and 4 when exchanging the collimator, and moves the first and second detectors 1 and 4 in the Y-axis direction shown in the figure. First
The second proximity movement mechanism units 9a and 9b are movement mechanisms for moving the positions of the detectors 1 and 4 in the Z-axis direction in the drawing when exchanging the position collimator of the detectors 1 and 4 during the collection of the proximity orbit data. is there.

The horizontal movement mechanism 10 moves the first and second detectors 1 and 4 together with the stand 6 along the direction in which the top plate 11 for the subject is extended, that is, along the X-axis to measure a subject (not shown). This is a moving mechanism for aligning the positions of the detectors 1 and 4 with the parts and moving the positions of the detectors 1 and 4 to the position of the collimator storage means 7 when the collimator is replaced.

The operation console 101 inputs measurement instructions and measurement conditions of an examiner (not shown),
This is a well-known operation console for giving instructions such as display control of measurement results. First top plate support 102a
Is a top support for supporting one side of the subject top plate 11, and the monitor 103 displays measurement conditions, images during measurement, and the like.

FIG. 6 is a diagram for explaining the operation of the scintillation camera device. Hereinafter, the measurement operation by the scintillation camera device will be described with reference to FIGS. However, 102b shown in FIG. 6 is a second top support, which supports the other side of the subject top plate 11. Reference numeral 12 denotes a subject.

At the time of measurement, first, the examiner positions the detectors 1 and 4 with respect to the subject 12 placed on the subject top plate 11, that is, the stand 6 so that the organ of interest is always within the field of view. Is determined by the lateral movement mechanism 10. Next, when the examiner instructs, for example, the well-known approach orbit SPECT data collection from the operation console 101, the approach movement mechanism units 9a and 9b, the first and second top plate supports 102a and 102b, and a stand (not shown) , The detection of gamma rays emitted from the subject 12, that is, the collection of projection data, is performed over the entire subject 12. However, the collected projection data is transferred to an image processing means (not shown) connected to the scintillation camera device and stored in the image processing means. When the collection of the projection data for the entire circumference is completed, the image processing means
First, after performing a well-known filtering process to improve blur, projection noise, and the like included in the projection data, a reconstruction operation for reconstructing a tomographic image is performed, and the obtained tomographic image of the subject 12 is obtained. It is displayed on the monitor 103.

Next, when collecting the whole body image data, the detectors 1 and 4 are moved along the body axis direction over the whole body of the subject 12 by the lateral movement mechanism unit 10 in accordance with an instruction from the operation console 101 by the examiner. By moving, the gamma rays emitted from the subject 12 are detected, that is, projection data is collected. Subsequent processing is SPEC
This is performed in the same manner as when collecting T data.

The subject top plate used at the time of the SPECT image data collection puts and supports the legs, waist, abdomen, chest, and head of the subject 12 excluding both arms, as shown at 11S in FIG. It is desirable that the top plate has the smallest width possible. This is because it is desired to rotate the detector around the object as close as possible to the object. Therefore, SPEC
At the time of T data collection, both arms of the subject are brought into close contact with both sides of the upper body (sometimes, the upper body is tied up with a cord or band) to perform detection.

On the other hand, when collecting the whole body image data, as shown in FIG. 3, a wide top plate 11h on which the whole body of the subject 12 including both arms is sufficiently placed is used. The subject top plate used for the scintillation camera device is S
It was necessary to change the subject top plate because it differs depending on when the PECT data was collected and when the whole body was collected. However, the top plate is large and heavy, especially the wide top plate for whole body data collection is large and heavy. Was not easy.

In order to improve the replacement work, an auxiliary top plate 22 having a horizontal portion on which a hand or an arm can be placed is attached to the top plate 11s used at the time of SPECT image data collection as shown in FIG. Was made.

A first method adopted as a method of attaching the auxiliary top plate is to attach an auxiliary top plate 22 (material wood) having a predetermined length and width as shown in FIG.
It is used by being sandwiched between the T-tops 11s. In the second method, as shown in FIG. 4 (c), a groove-shaped chuck portion 23c composed of two continuous upper and lower plate-shaped sandwiching pieces 23a and 23b is provided at a joint portion of the auxiliary top plate 22, and the SPECT top plate is provided. 1
This is a method in which this chuck portion is fitted to both left and right width ends of 1S and the auxiliary top plate 22 is attached.

[0015]

In the above prior art, a wide top plate 11h for collecting whole body image data is provided.
The replacement of the SPECT image data collection top plate 11s with the SPECT image data collection was not easy because the top plate was heavy.

In addition, since the auxiliary top plate 22 and the SPECT top plate 11s overlap upon detection from the back of the subject, the absorption of irradiation rays (γ-rays) increases, and the resolution of the image deteriorates. . In addition, when the auxiliary top plate shown in FIG. 4C is used, a continuous plate-shaped portion 2 above and below the chuck portion 23c of the auxiliary top plate 22 is used at the joint with the SPECT top plate.
3a and 23b overlap with both ends of the SPECT top plate, which increases the absorption of γ-rays, and similarly degrades the resolution. In each case, the hand and arm of the auxiliary top plate on which the hand and arm are mounted are horizontal, so that the hand and arm of the subject may protrude from the field of view of the detector.

[0017]

The above object is achieved by the following technical means. (1) A detector is provided at a predetermined position with respect to the subject on the subject top plate, and rotating means for supporting and rotating the detector is provided, and the detector is rotated around the subject. SPEC
A scintillation camera device that collects T image data and moves the detector in the body axis direction of the subject to collect whole body image data. A scintillation camera device, wherein a top plate is attached to form a top plate for collecting a whole body image, and a plug-in fitting structure formed by alternately bending the plug-in mounting portions of the auxiliary top plate up and down. . (2) The scintillation camera device according to the above (1), wherein the detector is of a two-detector type which is arranged opposite to a subject top plate. (3) The scintillation camera device according to (1) or (2), wherein the auxiliary top plate is made of an aluminum material. (4) The scintillation camera device according to any one of the above (1) to (3), wherein the auxiliary top plate is attached to be inclined so that the outer end is higher. (5) The scintillation camera device according to any one of (1) to (4), wherein an arm approaching wall is provided at an outer end of the auxiliary top plate.

[0018]

FIG. 1 is a diagram showing a scintillation camera device according to an embodiment of the present invention. In FIG. 1, 1 is a first detector, 4 is a second detector, 5a is a first detector.
5b is a second collimator, 6 is a stand, 8a and 8b are first and second parallel moving mechanism units,
Reference numerals 9a and 9b denote first and second proximity moving mechanisms, respectively. Further, the stand 6 includes a lateral moving unit along the body axis direction of the subject, and a unit that rotates the detectors 1 and 4 about the rotation axis 20.

Reference numerals 102a and 102b denote SPEC for a subject.
It is a top support that supports the T top 11s, and includes means for adjusting the vertical position of the top. Reference numeral 103 denotes a monitor, which displays measurement conditions, an image being measured, and the like. Regarding the operation of the scintillation camera device when testing the subject,
The description is omitted because it is the same as that described above with reference to FIGS.

In the apparatus shown in FIG. 1, at the time of SPECT image data collection, the SPECT top 11s is used without mounting an auxiliary top as an object top, while FIG. 1 shows the whole body image data collection. In this way, the auxiliary top plate 22 inserted and attached from both left and right sides of the SPECT top plate is mounted to configure the subject top plate.

FIG. 2A shows an embodiment of the insertion portion of the auxiliary top plate 22. As shown in the figure, a cut is made in the auxiliary top plate at a predetermined pitch, and the blades are alternately bent as 24a upward and 24b downward so that the SPE is formed between them.
Constructs a CT top plate insertion fitting portion. SPECT top 11
FIG. 2 is a sectional view taken along the line BB of FIG.
(B). Since the insertion portions 24a and 24b of the auxiliary top plate do not overlap with each other in the γ-ray radiation direction, absorption of γ-rays can be reduced.

An aluminum material is used for the auxiliary top plate. The aluminum material is suitable from the viewpoints of γ-ray absorption (several%), workability, strength, price, and the like. The thickness of the aluminum material used as the auxiliary top plate is about 2 mm. In addition, carbon fiber reinforced plastic can be used for the auxiliary top plate because it has low absorption of gamma rays (8 to 10%), but it has drawbacks in workability and is expensive.

As shown in FIG. 2B, the auxiliary top plate 22 is mounted on the outside so as to be slightly higher. By tilting in this manner, the subject's hands and arms are placed on the torso side (inside) of the body.
And will be placed in the field of view of the detector during the inspection. In addition, as shown in FIG. 2B, by providing an arm shift wall 25 at the outer end of the auxiliary top plate, both the horizontal auxiliary top plate and the inclined auxiliary top plate hold the subject's hand and arm within the detector field of view. it can.

[0024]

The scintillation camera device of the present invention can easily be made a whole body top plate by inserting and attaching an auxiliary top plate to the SPECT top plate.

Further, since the insertion mounting portion of the auxiliary top plate is bent alternately up and down so as not to overlap, absorption of γ-rays at the time of detection from the back of the subject can be reduced, and a clear image can be obtained. . In addition, since the auxiliary top plate is mounted to be inclined so that the outside is high, and the arm-adjusting wall is provided at the outer end of the auxiliary top plate, the hand and arm of the subject are moved inward and within the field of view of the detector. Can be held.

Further, when an aluminum material is used for the auxiliary top plate, absorption of γ-rays is reduced, which is advantageous in terms of workability, cost and the like.

[Brief description of the drawings]

FIG. 1 is an embodiment diagram of the present invention.

FIG. 2 is an explanatory diagram of an auxiliary top plate and an attachment state thereof according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

FIG. 4 is an explanatory diagram of an auxiliary top plate according to the related art.

FIG. 5 is a general explanatory diagram of a scintillation camera device.

FIG. 6 is a general explanatory diagram of a scintillation camera device.

[Explanation of symbols]

 1, 4 detector 5a, 5b collimator 6 stand 8a, 8b parallel movement mechanism 9a, 9b proximity movement mechanism 11 subject top plate 11h whole body image collection top plate 11s SPECT image collection top plate 12 subject 22 Auxiliary top plate 102a, 102b Top plate support 103 Monitor

Claims (1)

[Claims] A detector disposed at a predetermined position with respect to the subject on the subject top plate; and a rotating means for supporting and rotating the detector, wherein the detector is provided around the subject. In a scintillation camera device that collects whole body image data by moving the detector in the body axis direction of the subject by rotating the
An auxiliary top plate is attached to the CT image collection top plate by a removable plug-in mounting portion to form a whole body image collection top plate, and the above-mentioned auxiliary top plate plug-in mounting portion is alternately bent up and down. A scintillation camera device having a formed insertion fitting structure.