JPS6183984A - Ect apparatus - Google Patents

Abstract

PURPOSE:To make it possible to photograph even a small object with high sensitivity and high resolving power, by allowing scintillation cameras arranged in a polygonal pattern to approach with each other corresponding to the size of the object. CONSTITUTION:Scintillation cameras 1-4 are arranged in a square pattern and collimators 11, 21, 31, 41 are provided to the side of the detection surfaces of said cameras 1-4 while the detection surfaces are directed at right angles with respect to the center 0. The cameras 1-4 can freely move to the directions of slide shafts 12, 22, 32, 42 by rotating motors 16, 26, 36, 46. Further, the camer as 1-4 respectively shift along the sides of the square pattern toward a counter clockwise direction and can advance toward the center 0 while avoided from collision to each other and, therefore, the size of the square region surrounded by the cameras 4 can be freely changed. By this method, even in the case of an object having a large abdominal part or an object having a small head part, photographing with high sensitivity and high resolving power can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to an ECT device of a type in which a single photon scintillation camera is rotated.

(b) Prior Art In an ECT device of the type that uses a single photon-emitting nuclide as a radioactive drug administered to a subject and rotates a scintillation camera around the subject, it is necessary to obtain data from 360' directions, so 1 (11 scintillation When rotating the camera, it has to be rotated 3600 times, which takes time to collect data.Therefore, conventionally, 341 or more scintillation cameras are arranged in a polygon, and these 3 or more scintillation cameras are It is proposed to rotate it as

According to this, since 360' is shared by each scintillation camera, for example, if four scintillation cameras are arranged in a rectangle, 3600 minutes of data can be obtained by rotating 900, which reduces the data collection time. It can be made into a number.

By the way, when configuring an ECT apparatus by arranging scintillation cameras in a polygonal manner as described above, if it is designed for abdominal imaging, there will be a problem when imaging the head. That is,
In the case of the abdomen, the subject is large, so even if the scintillation cameras are brought close enough to the subject to rotate without colliding with each other to improve sensitivity, the internal space of the polygon surrounded by the scintillation cameras will be large. Therefore, when photographing the head, there is a distance from the subject's head to each scintillation camera, and the sensitivity and resolution decrease accordingly.

(c) Purpose This invention provides an ECT device in which scintillation cameras are arrayed in a polygon, which allows each scintillation camera to approach the subject according to the size of the subject, thereby achieving high sensitivity and high resolution even for small subjects. The aim is to improve the ability to shoot with.

(d) Configuration In the ECT device of the present invention, three or more scintillation cameras facing the center are arranged in a polygon,
These scintillation cameras are held by a holding mechanism. This holding mechanism has a function of moving these scintillation cameras in the same circumferential direction along each side of the polygon, thereby allowing the scintillation cameras to approach each other toward the center while avoiding collisions with each other. ing. The holding mechanism and the scintillation camera held thereby are rotated as a whole around the center.

(E) Embodiment In FIGS. 1 and 2, four scintillation cameras 1 to 4 are arranged in a rectangular shape, and each of these four scintillation cameras 1 to 4 has a collimator 11, 21 on the detection surface side. .31.41, and the detection surface is oriented at right angles to the center 0. A sliding shaft 12 is attached to the zero rotation plate 5.
．． 22.32.42 are fixed and bearings 13.2 are attached to these.
3°33.43 is attached so as to be slidable in the axial direction. The four scintillation cameras 1-4 are held by bearings 13.23.33.43, respectively. Nuts 14, 24, 34, 44 are attached to each of the scintillation cameras 1 to 4, and threaded rods 15, 25, 35, 45 are screwed into these nuts, respectively. These threaded rods are each driven by motors 16, 26, 36, 46 which are fixed to the one-turn plate 5. Therefore, motor 16.26.36.46
By rotating, scintillation cameras 1 to 4
each can be freely moved in the direction of the sliding axis 12.22.32.42. The motors 16, 26, 36, and 46 are operated in synchronization with each other so that each of the scintillation cameras 1 to 4 moves the same amount. Moreover, the sliding shafts 12, 22, 32, 42 are tilted at an angle of 45° with respect to the detection planes of the scintillation cameras 1 to 4, which are oriented at right angles to the center O. Therefore, when the scintillation cameras 1 to 4 move closer to the center 0, they simultaneously move in one circumferential direction, counterclockwise in FIG. 1, along each side of the quadrangle.

In other words, focusing on one end 17.27.37.47 of the clockwise side of the scintillation cameras 1 to 4, the scintillation cameras 1 to 4 move forward toward the center 0 as shown by the arrow 18.28.38.48. 4 is moved.

Therefore, since the scintillation cameras 1 to 4 are moved in this way, the scintillation cameras 1 to 4 are shifted counterclockwise along each side of the rectangle, thereby avoiding collision with each other. , can move forward toward the center O. As a result, the rectangular area surrounded by the scintillation cameras 1 to 4 can be made as large as shown in FIG. 3A or as small as shown in FIG. 3B.

The rotating plate 5 is rotatably held on the base 7 by rollers 6. The rotating plate 5 and the base 7 are provided with through holes 51.71 around the central axis O.
．． 71, and the subject is inserted into a rectangular area surrounded by scintillation cameras 1 to 4.

When photographing the subject's abdomen, the rectangular area surrounded by the scintillation cameras 1 to 4 is enlarged as shown in FIG. 3A so that the abdomen falls within this area. Also, when trying to photograph the head, the rectangular area surrounded by the scintillation cameras 1 to 4 is made smaller as shown in Figure 3B, and the head and scintillation cameras 1 to 4 are placed within this area. The distance between the scintillation cameras 1 to 4 and the detection surface can be made as short as possible within a range where the scintillation cameras 1 to 4 do not collide with the subject.

After adjusting the positions of the scintillation cameras 1 to 4 in this manner, the subject's body part to be imaged is set and the rotary plate 5 is rotated. In this case, by rotating it by 90', all data in 360° directions around the subject can be collected, and data collection can be completed in a short time.

In addition, in the above example, four scintillation cameras are used, and four scintillation cameras are used.
Although they are arranged in a rectangular shape, they are not limited to a quadrangular shape, such as arranging three in a triangle or six in a hexagon.

Furthermore, the mechanism for holding the scintillation camera on the rotary plate is not limited to the mechanism for holding the scintillation camera so that it can slide freely in one direction as described above, but in short, the mechanism for holding the scintillation camera on the rotary plate supports movement toward the sides of the polygon and movement toward the center. It should be done at the same time, so
Various configurations are possible, such as configuring the moving mechanism toward the center and the moving mechanism toward the sides separately, and configuring one to be supported by the other and then supporting the scintillation camera.

(f) Effects According to the ECT device of the present invention, each scintillation camera arranged in a polygon can be brought close to each other according to the size of the subject, so there are two scintillation cameras for the abdomen and the head.
There is no need to prepare a separate device, and it is possible to photograph both large objects such as the abdomen and small objects such as the head with high sensitivity and high resolution.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention, FIG. 2 is a schematic vertical sectional view of the same embodiment, and FIGS. 3A and 3B are scintillation cameras for explaining the position of the scintillation camera. FIG. 1 to 4... Scintillation camera 11.21.31.41... Collimator 12.22.
32.42...Sliding shaft 13.23.33.43...Bearing 14.24.34.44...Nut 15.25.35.45...Threaded rod 16.26.36.46 ...Motor 5...Rotating plate 6...Roller 7...Base

Claims (1)

[Claims] (1) Three or more scintillation cameras arranged in a polygon, each facing the center, and moving these scintillation cameras in the same circumferential direction along each side of the polygon, and moving them toward the center toward each other. An ECT apparatus comprising: a holding mechanism that can be approached; and a rotation mechanism that rotates the holding mechanism and the scintillation camera held by the holding mechanism as a whole around the center.