WO2017050280A1

WO2017050280A1 - Device for adjusting bore size of detector ring of pet system

Info

Publication number: WO2017050280A1
Application number: PCT/CN2016/099926
Authority: WO
Inventors: 许剑锋; 郭峰; 彭旗宇; 陈杰; 谢思维; 许光立
Original assignee: 华中科技大学
Priority date: 2015-09-24
Filing date: 2016-09-23
Publication date: 2017-03-30
Also published as: CN105342632A; CN105342632B

Abstract

Provided is a device for adjusting the bore size of a detector ring of a PET system, comprising a fixed disc (10) and a rotating disc (20). N slide grooves (12) in radial spoke distribution are provided around a centre round hole (11) of the fixed disc (10). The surface of the rotating disc (20) is provided with planar threaded grooves (22) which form an Archimedean spiral on the surface of the rotating disc (20). The rotating disc (20) is suspended on the bottom surface of the fixed disc (10) through a supporting wheel (30), and moving parts (40) are mounted in the slide grooves (12) of the fixed disc (10) respectively. The moving parts (40) are capable of radically moving along the slide grooves (12) under the rotation action of the planar threaded grooves (22). A connection plate (50) is mounted on the surface of each slide groove (12) of the fixed disc (10) and is connected to the corresponding moving part (40). When the device is in operation, a detector (60) is mounted on each connection plate (50), and all the detectors (60) collectively form the detector ring. The device uses an electric motor to drive the rotating disc (20) to rotate so as to drive a circle of the detectors (60) to move radically, and accordingly the bore size of the detector ring is changed. Compared with the existing similar devices, the device has the advantages of a greatly simplified structure and reduced costs.

Description

PET system detector ring aperture adjusting device

[Technical Field]

The invention belongs to a component of a medical imaging device, and particularly relates to a PET system detector ring aperture adjusting device, which can change the size of a ring of a positron emission tomography detector ring to adapt to different parts of the body, thereby improving the device. Sensitivity.

【Background technique】

The positron emission tomography (PET) system is a special medical imaging device that can construct an image reflecting the physiological function of the site to be tested according to the specific distribution of the radiotracer in the human or animal body. Existing PET systems include detector loops, data acquisition systems, image reconstruction software, and mechanical components such as hospital beds.

The detector ring of the existing PET system is surrounded by a plurality of detectors to form a ring device, and the ring aperture surrounded by the ring device is fixed in size. For a whole-body medical PET system, in order to be able to adapt to the whole body detection, the ring diameter of the detector ring must be large enough; when it is used to detect small parts of the body, such as the head, it is necessary to reduce its aperture to improve the system. Sensitivity.

Therefore, there is a need for a device that can vary the size of the detector ring aperture to accommodate different sized locations. The existing method is to install a motor, a screw, and a rail system for each detector to control the position of each detector from the center of the circle to change the size of the aperture of the detector ring. However, this method requires a large number of motors, lead screws, and guide rails. A whole body medical PET system may consist of hundreds of detectors, and solving the problem in this way is costly.

[Summary of the Invention]

The invention provides a PET system detector ring aperture adjusting device, which can realize the radial movement of the detector, solves the problem that the existing similar device has a complicated structure and high cost, and is used for changing the size of the detector ring aperture.

The invention provides a PET system detector ring aperture adjusting device, comprising a fixed disk and a rotating Turntable, which is characterized by:

The fixing plate is a rectangular plate having a central circular hole, and has a plurality of sliding grooves distributed in a radial shape around the central circular hole, the cross section of which is a convex shape, and the extension line of the central axis of each sliding groove intersects The center of the center circular hole, 6 ≤ N ≤ 100;

The rotating disk is a disk having a central through hole, the center of the disk coincides with the center of the central circular hole of the fixed disk, the aperture of the central through hole is equal to the central circular hole, and the surface of the rotating disk has a planar thread groove The planar thread groove forms an Archimedes spiral on the surface of the rotating disk; the rotating disk is suspended on the bottom surface of the fixed disk by a supporting wheel uniformly distributed along the circumference thereof, and the surface having the planar thread groove is upward, in an external force Under the action, it can make a rotary motion around its center;

Each of the sliding grooves of the fixing plate is provided with a movable member, and the bottom surface of the movable member is matched with the planar thread groove of the rotating disk. Under the rotation of the planar thread groove, the movable members can move radially along the sliding groove;

Each of the sliding groove surfaces of the fixing plate is mounted with a connecting plate which is connected with the corresponding movable member and can be adjusted in a position relative to the latter in the radial direction;

During operation, detectors are mounted on each of the connecting plates, and the detectors together form a detector ring.

The PET system detector ring aperture adjusting device is characterized in that:

The movable member has a cross-sectional shape in a convex shape, and is matched with the cross-sectional shape of the sliding groove. The bottom surface of the movable member has two protruding thread teeth, which can engage with the planar thread groove of the rotating disk; the top surface of the movable member has a waist shape. Slots and threaded blind holes.

The bottom surface of the connecting plate has a positioning protrusion for slidingly engaging along the waist groove; the connecting plate has a connecting hole, and both sides of the lower part of the connecting hole respectively have a pin hole and a screw hole; the connecting hole is a waist shape a hole for engaging a threaded hole of the movable member through a screw, thereby adjusting both the position of the connecting plate in the radial direction relative to the movable member and the two; the pin hole for detecting by the pin pair Positioning the screw hole for connecting to the detector by a screw.

In the working of the invention, since the detectors constituting the detector ring need to form a circular shape, the movable member must be engaged with the planar thread groove of the rotating disk during the installation process, and the movable member is mounted on the fixed disk by a circle, due to the planar thread The structure of the groove is limited, and each angled movable member has a displacement in the radial direction. After the installation, all the movable members do not form a circular shape, so the screw is connected to the movable member through the connecting hole of the connecting plate, and The positioning protrusion of the connecting plate cooperates with the waist groove of the movable member to ensure the radial movement of the connecting plate relative to the movable member, and adjust the radial position of the connecting plate relative to the movable member to ensure that all the detectors are circular;

When the rotating disc rotates, the two protruding threads on the bottom surface of the movable member cooperate with the flat thread groove of the rotating disc. Under the rotation of the planar thread groove, the movable member moves along the sliding groove of the fixed disc, through the connecting plate and the activity. The detectors that are connected together also move radially along with the movable member, thereby changing the size of the detector ring aperture. When the lead of the plane thread is determined, the distance of the movable member can be controlled by controlling the number of revolutions of the rotating disc, thereby precisely controlling the size of the ring aperture.

The invention uses a motor to drive the rotation of the rotating disk to drive a circle of the detector to move in the radial direction, thereby changing the size of the aperture of the detector ring; and the existing similar device by installing a motor, a lead screw and a guide rail on each detector Compared with the way, the structure is greatly simplified and the cost is saved.

[Description of the Drawings]

Figure 1 is a half cross-sectional view showing a top view of an embodiment of the present invention;

2(A) is a plan view of a fixed disk according to an embodiment of the present invention;

Figure 2 (B) is an enlarged cross-sectional view taken along line A-A of Figure 2 (A);

Figure 3 (A) is a top view of the rotating disk of the present invention,

Figure 3 (B) is a cross-sectional view taken along line B-B of Figure 3 (A);

Figure 3 (C) is a bottom view of the rotating disk connected to the fixed disk;

Figure 3 (D) is a plan view of the fixed disk after connecting the rotating disk;

Figure 3 (E) is an enlarged cross-sectional view taken along line C-C of Figure 3 (D);

Figure 3 (F) is a plan view of the fixing plate after the connection plate is installed;

Figure 4 (A) is a front view of the movable member;

Figure 4 (B) is a cross-sectional view taken along line D-D of Figure 4 (A),

Figure 4 (C) is a cross-sectional view taken along line E-E of Figure 4 (A);

Figure 5 (A) is a front view of the connecting plate;

Figure 5 (B) is a cross-sectional view taken along line F-F of Figure 5 (A),

Figure 5 (C) is a front view of the connection plate and the detector;

Fig. 5(D) is a cross-sectional view taken along line G-G of Fig. 5(C).

【detailed description】

The invention is further described below in conjunction with the drawings.

As shown in Figure 1, an embodiment of the present invention includes a fixed disk 10 and a rotating disk 20;

As shown in FIG. 2(A), the fixed disk 10 is a rectangular plate having a central circular hole 11 having 48 sliding grooves 12 distributed in a radial shape around the central circular hole 11, as shown in FIG. 2 (FIG. 2). B), the cross section of the chute 12 is convex, and the extension line of the central axis of each chute 12 intersects the center of the central circular hole 11;

As shown in FIG. 3(A), FIG. 3(B), and FIG. 3(C), the rotary disk 20 is a disk having a central through hole 21, and the center of the disk and the center circular hole 11 of the fixed disk The center of the hole is coincident, the aperture of the central through hole 21 is equal to the central circular hole 11, and the surface of the rotary disk 20 has a planar thread groove 22, and the planar thread groove 22 constitutes an Archimedes spiral on the surface of the rotary disk 20; Rotating disk 20 passes along The support wheel 30 whose circumference is evenly distributed is hung on the bottom surface of the fixed disc 10, and has one side of the plane thread groove 22 upward, and can rotate around the center of the circle under the action of an external force;

As shown in FIG. 3(D), each of the sliding slots 12 of the fixed disk 10 is provided with a movable member 40. As shown in FIG. 3(E), the bottom surface of the movable member 40 and the planar threaded groove 22 of the rotating disk. Matching, under the rotation of the planar thread groove 22, each movable member 40 can move radially along the chute 12;

As shown in FIG. 3(F), the surface of each sliding slot 12 of the fixed disk 10 is mounted with a connecting plate 50 which is connected with the corresponding movable member 40 and can be adjusted in a position relative to the latter in the radial direction;

As shown in FIG. 4(A), FIG. 4(B), and FIG. 4(C), the movable member 40 has a cross-sectional shape in a convex shape, which matches the cross-sectional shape of the sliding slot 12, and has two bottom surfaces of the movable member 40. The raised thread 41 is engageable with the planar threaded groove 22 of the rotating disk; the top surface of the movable member 40 has a waisted groove 42 and a threaded blind hole 43.

As shown in FIG. 5(A), FIG. 5(B), and FIG. 5(D), the bottom surface of the connecting plate 50 has a positioning protrusion 51 for slidingly engaging along the waist groove 42. The connecting plate 50 has The connecting hole 52 has a pin hole 53 and a screw hole 54 on both sides of the lower portion of the connecting hole 52; the connecting hole 52 is a waist hole for engaging with the thread blind hole 43 of the movable member 40 through the screw. , thereby connecting the connecting plate 50 and the movable member 40;

As shown in FIG. 5(C), in operation, each of the connecting plates 50 is mounted with a detector 60. The detector 60 is positioned by a pin hole 53 in the connecting plate 50 and connected to the screw hole 54 by screws. The units 60 together form a detector ring.

Claims

A PET system detector ring aperture adjusting device comprises a fixed disk (10) and a rotating disk (20), characterized in that:

The fixing plate (10) is a rectangular plate having a central circular hole (11), and has four N-shaped radial grooves (12) around the central circular hole (11), the cross section of which is convex , the extension line of the central axis of each chute (12) intersects the center of the central circular hole (11), 6 ≤ N ≤ 100;

The rotating disk (20) is a disk having a central through hole (21) whose center coincides with the center of the central circular hole (11) of the fixed disk, the aperture of the central through hole (21) and the The central circular holes (11) are equal, and the surface of the rotating disk (20) has a planar thread groove (22), and the planar thread groove (22) constitutes an Archimedes spiral on the surface of the rotating disk (20); 20) hanging on the bottom surface of the fixed disc (10) by a support wheel (30) evenly distributed along its circumference, with one side of the flat thread groove (22) facing upward, and can rotate around its center under the action of an external force;

Each of the sliding slots (12) of the fixing plate (10) is provided with a movable member (40), and the bottom surface of the movable member (40) is matched with the planar thread groove (22) of the rotating disk, and the flat thread groove (22) Under the action of rotation, each movable member (40) can move radially along the chute (12);

Each of the sliding grooves (12) of the fixing plate (10) is mounted with a connecting plate (50) connected to the corresponding movable member (40) and capable of adjusting the position in the radial direction relative to the latter;

During operation, detectors (60) are mounted on each of the connecting plates (50), and each detector (60) together constitutes a detector ring.
A PET system detector ring aperture adjustment apparatus according to claim 1, wherein:

The movable member (40) has a cross-sectional shape in a chevron shape, and has a cross-sectional shape of the sliding groove (12) The movable member (40) has two raised threads (41) on the bottom surface thereof, which can be engaged with the planar thread groove (22) of the rotating disk; the top surface of the movable member (40) has a waist groove (42) and a thread blind Hole (43).
A PET system detector ring aperture adjusting device according to claim 1 or 2, wherein:

The bottom surface of the connecting plate (50) has a positioning protrusion (51) for slidingly engaging along the waist groove (42); the connecting plate (50) has a connecting hole (52), and the connecting hole (52) has two lower portions. The sides respectively have a pin hole (53) and a screw hole (54); the connecting hole (52) is a waist hole for threading a blind hole (43) with the movable member (40) through the screw Cooperating, thereby adjusting both the position of the connecting plate (50) in the radial direction relative to the movable member (40) and the two; the pin hole (53) for positioning the detector (60) by the pin, A screw hole (54) is used to connect to the detector (60) by screws.