JPH0452701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scintillation camera, and in particular, a radiation detector attached to the tip of an arm protruding from a base, which is supported by the base. The present invention relates to a device suitable for holding a rotary table in an arbitrary position by a drive mechanism provided on a rotary table.

[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 television monitor, and positioning the radiation detector requires considerable time and effort. .

Furthermore, conventionally, since the radiation detector is oscillated relative to the arm by a drive mechanism installed on the arm, the size and weight of the arm are increased due to the drive mechanism, and the arm is also increased in size and weight. The balance weight connected to the sensor becomes heavy, and the drive mechanism for swinging the arm and rotating the arm, weight, radiation detector, etc. needs to be larger, which also makes adjustments difficult. was.

In addition, the posture holding mechanism of conventional radiation detectors is
Since a belt is used as a connecting component, when the rotary table is rotated and the direction of gravity applied to the radiation detector is changed, the radiation detector is shaken due to the elongation of the belt, resulting in poor posture holding accuracy. If the belt width is widened in order to suppress this elongation, there is also the problem that the installation space for the entire mechanism increases.

An object of the present invention is to provide an improved scintillation camera of this type that can easily and quickly position a radiation detector with high precision.

[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 by 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; A scintillation camera is equipped with a radiation detector mounted so as to be able to swing at any angle independently of the swinging of the arm, using a shaft as a fulcrum as a fulcrum. A wire rope is loosely fitted to the end of the shaft of the swing fulcrum of the arm provided on the rotary table, and is rotatably fitted to the fixed first winding drum and the first winding drum. a second winding drum having the same diameter as the first winding drum that is suspended;
A drive mechanism attached to the rotary table is provided for selectively operating a control operation to bring the winding drum into a rotating state and a control action to make it non-rotatable.

[Operation] With the above configuration, the drive mechanism attached to the rotary table is driven to rotate the first winding drum connected to the second winding drum by a wire rope, and The shaft to which the first winding drum is fixed is rotated. 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 winding drums are equal, the arbitrary amount of rotation of the first winding drum rotated by the drive mechanism directly becomes the swing angle of the radiation detector. 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 winding drum is made unrotatable, the wire rope connecting both the first and second winding drums is connected to the second winding drum. The winding position of the first winding drum with the winding drum changes by the swinging of the arm, and the first winding drum is rotated by the amount of change. In this case, since the diameters of the first and second winding drums are equal, the relative angle of the radiation detector to the subject changes equally before and after the arm swings; The posture of the radiation detector can be maintained as it is.

The operation of rotating the second winding drum to set the radiation detector in a desired posture, and the operation of making the second winding drum unrotatable and maintaining the above posture when the arm swings are as follows: , the drive mechanism, the arm,
Since the first and second drum wheels 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 4, 11 represents a radiation detector, and 12 represents an arm that supports 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. A radiation detector 11 is supported at the free end of the arm,
The arm 12 can be moved up and down by being swung around the 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. For this reason, the radiation detector 11 is mounted on a rotary table 13.
By the rotation of the rotary table 13, the rotary table 13 can be rotated around the rotation center axis.

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 winding drum wheel 17 (first winding drum wheel) is fixed to the end of the shaft 16. On the other hand, a winding drum wheel 18 (second winding drum wheel) is rotatably fitted loosely 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. Here, the winding drum 17 and the winding drum 18
It has the same diameter and the rotation ratio is 1:1. Reference numeral 20 denotes an electric motor with a brake, which is attached to the rotary table 13 and is capable of selectively operating a control operation in which the winding drum 18 is in a rotating state and a control operation in which it is in a non-rotatable state. It is. A drum wheel 21 is fitted and fixed to the output shaft of the electric motor 20. These winding wheels 17, 18, 21 are connected by a wire rope 19 as shown in FIG. Depending on the size of the load (in this embodiment, the radiation detector 11), this wire rope 19 can be made thicker in diameter or connected to multiple wire ropes, so that when the turntable 13 is rotated, the wire rope 19 can be attached to the radiation detector 11. It is possible to prevent blurring from occurring. Further, when the wire rope 19 is wound around the winding drum, the installation space is smaller than that of the belt, so the entire mechanism can be made smaller. Here, the winding drum and the wire rope are hung so as not to slip.

The part on the right side of FIG. 2 is a known mechanism for balancing and swinging the arm 12 supporting the radiation detector 11 in order to make it swingable. The configuration will be explained below with reference to the drawings. A weight 31 is disposed on the opposite side of the radiation detector 11 via the base 15 and the rotary table 13, and one end of the weight 31 is swingably supported on the rotary table 13 by a bearing (not shown) like the arm 12. The radiation detector 11 is installed on the arm 32 so as to maintain a weight balance with the radiation detector 11. 33 is a rod that connects the end of the arm 12 extending through the rotary table 13 and the arm 32;
3 forms a parallel link mechanism together with the arm 32. 35 is an end of the arm 12 extending through the rotary table 13 and the rotary table 1;
By extending and contracting the hydraulic cylinder 35, the parallel link mechanism is swung, and the radiation detector 11 is moved up and down.

Next, the effect will be explained. Radiation detector 1
1 is set in the initial state by rotating the winding drum 18 around the shaft 14.
That is, when the electric motor 20 is driven to rotate the winding drum 21, the winding drum 18, which is connected to the winding drum 21 by the wire rope 19, is rotated around the shaft 14. The rotation of the winding drum 18 causes the winding drum 17 and the shaft 16 to which the winding drum 17 is fixed to be rotated by the same amount as the rotation amount (rotation angle) of the winding drum 18 via the wire rope 19. Since the radiation detector 11 is attached to the shaft 16 so as to be able to swing independently regardless of the swing of the arm, the radiation detector 11 swings by the rotation angle of the shaft 16 and can be set to any desired initial state. Posture is set simply and easily.

On the other hand, after setting the above-mentioned initial posture, the winding drum 18
When the electric motor 20 is put in a braking state so that it cannot rotate, when the hydraulic cylinder 35 is actuated to swing the arm 12 and raise and lower the radiation detector 11, the wire rope 1 relative to the winding drum 18
The winding position of the wire rope 9 changes, and the winding drum wheel 17 is rotated only by the amount of change in the winding of the wire rope 19. In this case, since the drum wheels 18 and 17 have the same diameter, the relative posture between the subject and the radiation detector 11 before the swing of the arm 12 remains unchanged even after the swing of the arm 12. , it is possible to maintain the set initial posture of the radiation detector 11. 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 winding drum 18 (second winding drum) to place the radiation detector 11 in a desired posture, and an operation of turning the winding drum 18 into a non-rotatable state and an operation of the arm 12
The action of maintaining the above-mentioned posture during rocking is as follows:
The drive mechanism, arm 12, winding drum 18, winding drum 17, (first winding drum), and radiation detector 11
etc. are all provided on the rotary table 13, so it is possible to easily connect the radiation detector 11 and the body axis of the subject or the central axis of rotation of the rotary table 13 regardless of whether or not the rotary table 13 is rotating. By setting the relationship once using the electric motor 20, the setting can be easily and quickly performed regardless of the swinging of the arm 12. In particular, in a scintillation camera capable of performing 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 positioned as close to the subject as possible. For this purpose, the arm 12 is swung many times to determine the positional relationship between the radiation detector 11 and the subject.
Since the radiation detector 11 always remains in the same posture even when the detector 2 is swung, 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 despite the swinging of the arm, and it is possible to easily and quickly carry out photographing preparations and photographing operations.

In addition, depending on the size of the radiation detector, by increasing the diameter of the wire rope or hanging multiple wire ropes, it is possible to prevent the radiation detector from shaking due to stretching of the wire rope. Another advantage is that the installation space is smaller than that of the previous model.

[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 of a radiation detector and an arm that supports it, and FIG. 4 is an explanatory diagram of how to wind a wire rope. 11...Radiation detector, 12...Arm, 13
... Rotating table, 14 ... Arm swing center axis, 15
... Base, 16 ... Radiation detector rotation center axis,
17... Winding drum (first winding drum), 18... Winding drum (second winding drum), 19... Wire rope,
20... electric motor, 21... winding drum 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; A scintillation camera is provided with a radiation detector that can be attached to the scintillation camera, and the scintillation camera includes a first winding drum fixed to an end of a shaft provided at the tip of the arm, and a oscillation of the arm provided on the rotary table. a second winding drum wheel having the same diameter as the first winding drum wheel, which is rotatably loosely fitted to the end of the shaft of the dynamic fulcrum and has a wire rope suspended between it and the first winding drum wheel; , further comprising a drive mechanism attached to the rotary table that selectively operates a control operation that causes the second winding drum to be in a rotating state and a control operation that causes it to be in a non-rotatable state. scintillation camera.