JPH0446226Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a scintillation camera.
In particular, the present invention relates to a device suitable for holding a radiation detector attached to the tip of an arm protruding from a base in an arbitrary posture by a drive mechanism provided on a rotary table supported by the base.

[Prior Art] A conventional scintillation camera includes an upright flat base, a disc-shaped rotary base rotatably supported within the plane of the base, and a disc-shaped rotating base mounted on the rotary base. A pair of arms that can swing around a shaft are provided to protrude from the disc surface of the rotary table, a radiation detector is pivotally supported at one end of the arms across the swing center of the arms, and a radiation detector is pivotally supported at one end of the arms, and the other end A weight is attached to the side to balance the two, and by swinging the arm, the radiation detector can be raised and lowered.On the other hand, by rotating the rotary table, the radiation detector, along with the arm, weight, etc., is moved along the rotation axis of the rotary table. It is common that the device is configured so that it can be rotated around the
112263). In this type of scintillation camera, which raises and lowers the radiation detector by swinging the arm, the radiation detector also tilts as the arm swings, so radiation detection is performed using a manual or electric drive mechanism installed on the arm. The device can be swung to any angle independently of the oscillation of the arm.

[Problem that the invention aims to solve] When taking pictures with a scintillation camera,
The position of the radiation detector relative to the subject is set by adjusting the distance between the radiation detector and the subject, the parallelism between the body axis of the subject and the radiation detector, and the swinging of the arm and the swinging of the radiation detector. and by adjusting the rotation of the radiation detector. This adjustment is performed while observing the image captured by the scintillation camera on a monitor TV, but as the arm swings, the angle and distance between the radiation detector and the subject's body axis change. Each time the arm is swung, the radiation detector must be swung and rotated to adjust its posture while observing the monitor television, and it takes a considerable amount of time and effort to position the radiation detector. .

Furthermore, conventionally, the radiation detector is oscillated relative to the arm by a drive mechanism installed on the arm, which increases the size and weight of the arm due to the drive mechanism. The balancing weight becomes heavy, and the drive mechanism for swinging the arm and rotating the arm, weight, radiation detector, etc. needs to be larger, and it is also difficult to make adjustments. Ta.

The object of the present invention is to provide an improved scintillation camera of this type, which allows easy and quick positioning of the radiation detector.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an upright flat base and a disc-shaped base rotatably supported on the base within the plane of the base. a rotary table, a pair of arms protruding from the disc surface of the rotary table and swingable about a shaft provided on the rotary table as a fulcrum; In a scintillation camera equipped with a radiation detector mounted so as to be able to swing at any angle independently of the swing of the arm using the shaft as a fulcrum, the radiation detector is fixed to the end of the shaft provided at the tip of the arm. A belt is loosely fitted to the end of a shaft of a swing fulcrum of an arm provided on the rotary table, and is suspended between the first belt sheave and the first belt sheave. a second belt sheave having the same diameter as the first belt sheave;
A drive mechanism attached to the rotary table is provided for selectively operating a rotating operation of the belt pulley and a braking operation for rendering the belt pulley in a non-rotatable state.

[Operation] With the above configuration, when the drive mechanism attached to the rotary table is driven to rotate the second belt pulley, the first belt connected to the second belt pulley by the belt is rotated. The wheel is rotated, causing the first sheave to rotate the shaft to which it is fixed.
Since the radiation detector is attached to the shaft so that it can swing independently of the swing of the arm, the radiation detector swings by the amount of rotation of the shaft, regardless of the swing angle of the arm. In this case, since the diameters of the first and second belt pulleys are equal, the arbitrary amount of rotation of the first belt pulley rotated by the drive mechanism is
This becomes the swing angle of the radiation detector as it is, and the radiation detector can be placed in a desired posture.

On the other hand, when the drive mechanism attached to the rotary table is put into a braking state and the second belt pulley is made unrotatable, the belt connecting both the first and second belt pulleys and the second belt pulley are The position at which the arm is wound changes by the swinging of the arm, and the first belt pulley is rotated by the amount of change. In this case, since the diameters of the first and second belt pulleys are equal, the relative angle of the radiation detector to the subject remains the same before and after the arm swings; The posture of the radiation detector can be maintained as it is.

The operation of rotating the second belt pulley to bring the radiation detector into a desired posture, and the operation of making the second belt pulley unrotatable and maintaining the posture as it is when the arm swings, include: Since the drive mechanism, the arm, the first and second belt pulleys, and the radiation detector are all provided on the rotary table, this can be easily done regardless of whether the rotary table is rotating or not.

[Embodiment] An embodiment of the scintillation camera of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 3, 11 represents a radiation detector, and 12 and 12 represent arms that support the radiation detector 11, respectively. The arm consists of a pair of side members and a cross member that connects them, and a shaft 14 fixed to the side members is held by a bearing 13a on a rotary table 13.
The radiation detector 11 is supported by the free end of the arm, and can be raised and lowered by swinging the arm 12 around a shaft 14. Further, the rotary table 13 has a disk shape, and is rotatably supported within the plane of the base 15 by a bearing provided on an upright flat base 15. Therefore, the radiation detector 11 can be rotated around the central axis of rotation of the rotary table 13 by the rotation of the rotary table 13.

The radiation detector 11 is fixed with a shaft 16 protruding from a symmetrical position on its circumferential surface, and the shaft 16 is held by a bearing (not shown) provided on the arm 12 so that it can rotate on the arm 12. ing. The end of the shaft 16 protrudes from the side surface of the arm, and a belt pulley 17 (first belt pulley) is fixed to the end of the shaft 16. On the other hand, a belt pulley 18 (second belt pulley) is rotatably fitted into a position of a shaft 14, which serves as a swinging fulcrum of the arm 12, at a position protruding from the outer surface of the arm 12. endless belt 19
is wound around these belt pulleys 17 and 18. Here, the belt pulley 17 and the belt pulley 18 have the same diameter and a rotation ratio of 1:1. Reference numeral 21 denotes an electric motor with a brake attached to the rotary table 13 that can selectively operate the rotation operation of the belt pulley 18 and the braking operation to make it unable to rotate; 22, the belt pulley 18; The belt pulley 23 is coaxial and rotates integrally with the belt pulley 18, and is connected to the belt pulley 22 and the belt 25 by a belt 25. The belt pulley 23 is rotatably fitted into a shaft (not shown) provided on the rotary table 13. ing. 24 is a belt pulley that is coaxial with the belt pulley 23 and rotates integrally with the belt pulley 23; 26 is a belt pulley fixed to the output shaft of the electric motor 21; It is connected. Here, each of the belt pulleys and the belt are suspended so as not to slip. Reference numeral 31 shown in FIG. 2 is a weight disposed on the opposite side of the radiation detector 11 via the base 15 and the rotary table 13.
The radiation detector 11 is installed on an arm 32 that is swingably supported by the radiation detector 11 so as to be weight balanced. 33 is a rod that connects the end of the arm 12 extending through the rotary table 13 and the arm 32, and the arm 1 is connected by the rod 33.
2 and the arm 32 form a parallel link mechanism. A hydraulic cylinder 35 connects the end of the arm 12 extending through the rotary table 13 with the rotary table 13. By expanding and contracting the hydraulic cylinder 35, the parallel link mechanism is swung, and the radiation The detector 11 is raised and lowered.

Note that in this embodiment, the electric motor 21,
Belt pulleys 22, 23, 24, 26 and belt 2
5 and 27 form a drive mechanism that selectively operates the belt pulley 18, but the driving force of the electric motor 21 may be directly transmitted to the belt pulley 22.

Next, the effect will be explained. Radiation detector 1
1 is set by rotating the belt pulley 18 around the shaft 14.
That is, when the electric motor 21 is driven and the belt pulley 24 is rotated via the belt 27, the belt pulley 24
The belt pulley 23 and the belt pulley 22 connected by the belt 25 are rotated, and at the same time, the coaxial belt pulley 18 is rotated around the shaft 14. The rotation of the belt pulley 18 causes the belt pulley 17 and the shaft 16 to which the belt pulley 17 is fixed to rotate by the same amount as the rotation amount (rotation angle) of the belt pulley 18 via the belt 19. A radiation detector 1 is mounted on the shaft 16.
Since the radiation detector 1 is attached so as to be able to swing independently regardless of the swinging of the arm 12, the radiation detector 1
1 swings by the rotation angle of the shaft 16, and any desired initial posture can be set simply and easily.

On the other hand, after setting the above initial posture, the belt wheel 1
When the electric motor 21 is put in a braking state so that the arm 12 cannot be rotated, the belt 19 relative to the belt pulley 18 is actuated to swing the arm 12 and move the radiation detector 11 up and down.
The winding position of the belt 19 changes, and the belt pulley 17 is rotated by the amount of change in the winding of the belt 19. In this case, since the belt pulleys 18 and 17 have the same diameter,
The relative posture between the subject and the radiation detector 11 before the swinging of the arm 12 remains unchanged even after the swinging of the arm 12, and the set initial posture of the radiation detector 11 can be maintained. can. For example, if the radiation detector 11 is in a horizontal state as shown in FIG. 2, the radiation detector 11 can always be maintained horizontally regardless of the swinging of the arm 12.

an operation of rotating the belt pulley 18 (second belt pulley) to bring the radiation detector 11 into a desired posture;
The operation of making the belt pulley 18 unrotatable and maintaining the posture as it is when the arm 12 swings is performed by the drive mechanism, the arm 12, the belt pulley 1
8. Since the belt pulley 17 (first belt pulley) and the radiation detector 11 are all provided on the rotary table 13, radiation detection can be easily performed regardless of whether the rotary table 13 is rotating or not. By setting the relationship between the instrument 11 and the body axis of the subject or the rotation center axis of the rotary table 13 once using the electric motor 21, the setting can be easily and quickly performed regardless of the swinging of the arm 12. I can do it. In particular, with a scintillation camera that can perform single photon emission CT,
The radiation detector 11 is positioned so that it does not come into contact with the subject during rotation and is as close to the subject as possible, and for this purpose the arm 12 is swung many times to separate the radiation detector 11 from the subject. However, since the radiation detector 11 is always in the same posture even when the arm 12 is swung as described above, this can be done extremely easily, which is particularly advantageous.

[Effects of the invention] Since the present invention is configured as described above, the radiation detector can be set at any desired angle by the drive mechanism provided on the rotary table, and the radiation detector can be set at any desired angle. The posture of the camera can be maintained as it is regardless of the swinging of the arm, and it is possible to easily and quickly carry out photographing preparations and photographing operations.

[Brief explanation of the drawing]

Fig. 1 is a front view of a scintillation camera showing an embodiment of the present invention, Fig. 2 is a side view of Fig. 1,
FIG. 3 is a perspective view showing the configuration of the main parts of the present invention. 11...Radiation detector, 12...Arm, 13
... Rotating table, 14, 16 ... Axis, 15 ... Base,
17... Belt wheel (first belt wheel), 18...
Belt wheel (second belt wheel), 19, 25, 27
... Belt, 21 ... Electric motor, 22, 23, 2
4,26...belt car.

Claims (1)

[Scope of utility model registration request] An upright flat base, a disc-shaped rotary table supported by the base so as to be rotatable within the plane of the base, and a shaft provided on the rotary table that protrudes from the disk surface of the rotary table. a pair of arms that can be swung around the arm as a fulcrum, and that move up and down as the arms oscillate, and that can be swung to any angle independently of the oscillation of the arms using a shaft provided at the tip of the arm as a fulcrum; In a scintillation camera, the first belt pulley is fixed to the end of a shaft provided at the tip of the arm, and the arm provided on the rotary table is oscillated. a second belt sheave having the same diameter as the first belt sheave, the second belt sheave being rotatably fitted to the end of the shaft of the fulcrum and having a belt routed between it and the first belt sheave; A scintillation camera comprising: a drive mechanism attached to the rotary table that selectively operates a rotational operation of the belt pulley and a control operation for rendering it in a non-rotatable state.