JPH0612556Y2 - Scintillation camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a scintillation camera, and more particularly, a scintillation camera for arranging a detector for detecting radiation emitted from the inside of a subject at a desired portion of the subject placed on a bed. About the scintillation camera that can.

[Prior Art] In the field of nuclear medicine, a radioisotope (R
BACKGROUND ART A scintillation camera that displays various information in a subject on a screen or a photograph by administering I) and detecting radiation emitted from RI accumulated at a specific site of the subject is well known.

That is, a substance labeled with RI is orally or intravenously administered into a subject, and radiation emitted from the subject after a predetermined time is detected by a detector in which a large number of photomultiplier tubes are arranged. By doing so, scintigram photography that captures a plane image of the subject when looking at the subject from a certain direction or single radiation that continuously detects radiation from the 360 ° or 180 ° direction and captures a tomographic image of the subject. -Photon emission computed tomography (SPECT) tomography can be performed.

In such a scintillation camera, since the detector is positioned close to a desired portion of the subject, the detector can be moved in various directions such as the vertical direction with respect to the detector and the bed. Some are shown in FIGS. 2 and 3.

In FIG. 2, the detector 10 is attached to a detector support (hereinafter referred to as a gantry) 14 via an arch-shaped arm 12, and the gantry 14 is movable on a rail 16.

In addition, a bed 20 on which the subject 18 is placed is provided, and when photographing a whole body scintigram, the bed 20 is first moved to position the subject in the axial direction and the left-right direction. Then, the gantry 14 is moved up and down in the direction A in the drawing to be arranged near the surface of the subject 18, thereby completing the positioning.

Further, FIG. 3 shows an apparatus having a structure in which the arm 12 holds the weight 12a. Also in this case, the object 18 placed on the bed 20 is arranged at a predetermined position as in the apparatus of FIG. After that, the detector 10 is lowered in the direction A in the drawing to perform positioning.

In this way, the detector 10 is positioned in the vicinity of the subject 18, and the radiation incident from the collimator 10a is photoelectrically converted by the scintillator and the photomultiplier tube in the detector 10 to photograph the whole body scintigram. And SPECT
A tomographic image is taken.

[Problems to be Solved by the Invention] However, the conventional scintillation camera has a problem that the detector position is displaced in the body axis direction of the subject 18 when the detector 10 is positioned on the subject 18. .

That is, when the detector 10 is lowered and brought closer to the subject 18, the detector 10 makes a circular motion in the direction A around the rotation center O, and the detector 10 moves in the body axis direction. Therefore, once the site where the scintigram is to be taken is detected by the detector 1,
Even if it was set right below 0, the part would be out of the effective field of view of the detector 10, so the operator had to move the subject 18 again to perform alignment.

The same applies to the case of taking a SPECT tomographic image. The detector 10 moves in the body axis direction every time the radius of gyration of the detector 10 is changed, and the detector 10 and the subject 18 are separated from each other. The alignment was complicated.

Furthermore, when a recent SPECT tomographic image is taken, the detector 18 is moved on an elliptical orbit to detect the subject 18
Although there is an elliptical orbit SPECT apparatus that can bring the detector 10 closer to the object, there is a problem in this case that the effective field of view of the detector 10 is reduced by the movement in the body axis direction.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above conventional problems,
It is an object of the present invention to provide a scintillation camera which can prevent the detector from moving in the body axis direction and can widely use the effective field of view of the detector without moving the subject.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a detection supporting a detector for detecting radiation emitted from a subject and imaging information in the subject. Support base, a detector holding arm mounted movably on a rail provided on the detector support base, and a weight mounted in a movable state on the rail to balance the detector,
A loop-shaped tension wire that is disposed on the detector support base and is rotatable, and a drive device that drives the tension wire, and the tension wire has a detector and a weight in different directions. It is characterized in that the detector is moved in a direction perpendicular to the body axis of the subject by connecting the cable so as to move it and driving the cable.

[Operation] According to the above configuration, the loop-shaped tension wire is rotated by the driving device, and the detector and the weight connected to this tension wire are in different directions from each other, that is, both approach each other but separate from each other. Moved in either direction. Then, the detector moves in a direction perpendicular to the body axis of the object, for example, in the vertical direction when the detector is arranged right above, and in this case, the weight goes up when the detector goes down and the detector goes up. Sometimes it will go down.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a scintillation camera according to the present invention, in which a detector 10 is attached to a gantry 14 via a detector holding arm 22, and a weight 24 for balancing the detector 10 is located at the center of the gantry 14. It is arranged at a position symmetrical to the detector 10 with respect to the point.

Further, the detector 10 is rotatable in the direction C in the figure, and this is achieved by attaching a rotating plate 26 on which the detector 10, the weight 24, etc. are arranged to a large external toothed bearing 28. When the plate 26 is rotated by the motor 30 via the bearing 28, the detector 10 can be freely rotated around the subject.

A feature of the present invention is that the detector can be moved in the direction perpendicular to the body axis.

For this purpose, first, the detector holding arm 22 and the weight 24 are slidable on a rotating plate 26 of the gantry 14, and the rotating plate 26 has two rails 3 mounted thereon.
2a and 32b are formed, and on the other hand, slide guides 34 and 36 (the opposite side is not shown) that engage with the rail 32 are attached to the detector holding arm 22 and the weight 24, respectively.

A moving device is provided in order to move the detector 10 in a direction perpendicular to the axial direction of the subject body.
It consists of zero. That is, the tension wire 38a (38
In the embodiment, b) is a sprocket 42a (42b), 4 made of a chain and attached to the side surface of the gantry 14.
It is hung in a loop shape on 4a (44b). And
As shown in FIG. 2B, the tension wire 38 is connected so that both the detector 10 and the weight 24 move in mutually different directions.
2 and the like at the connecting portion 100, and the weight 24 is at the connecting portion 2
At 00, it is connected and fixed to the cable 38. The drive device 40 is composed of a motor having a clutch and a brake built therein, and moves the tension wire 38 in two reciprocating directions.

Accordingly, the detector holding arm 22 and the weight 24 can be moved toward or away from each other by reciprocating the tension wire 38 by the driving device 40, whereby the detector 10 is moved in the axial direction of the subject. On the other hand, it can be moved vertically, or vertically in the state shown in the figure.

In the embodiment, the tension wire 38 is made of a chain, but the present invention is not limited to this, and the belt 10 or the like may be used to drive them to move the detector 10.

According to the above-mentioned configuration, by merely disposing the imaging region of the subject directly under the detector 10, even if the detector 10 is set in the vicinity of the subject, a displacement in the body axis direction can be generated. Absent. Therefore, in this state, scintigram imaging can be favorably performed, and even when SPECT tomography is performed, the detector 10 can be easily positioned at the tomographic position of the subject 18 without adjusting the body axis direction, Further, it is possible to prevent the narrowing of the effective field of view which has occurred conventionally.

Further, in the present invention, another detector may be attached instead of the weight 24, which allows two detectors to efficiently perform imaging in a short time.

[Effects of the Invention] As described above, according to the present invention, the detector holding arm and the weight are connected by the tension wire, and the tension wire is reciprocally driven. Therefore, the detector is attached to the body of the subject. It is possible to move in the direction perpendicular to the axis, and it is possible to completely prevent positional displacement in the body axis direction when setting the detector on the subject.

As a result, setting for various imaging such as scintigram or SPECT tomographic image becomes easy, and S
A large effective field of view can be obtained in the case of PECT tomography, and rapid and favorable nuclear medicine diagnosis can be performed.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a scintillation camera according to the present invention, (a) is a front view, (b) is a side view,
(C) is a plan view, FIG. 2 is a view showing a conventional scintillation camera, and FIG. 3 is a view showing another conventional scintillation camera. DESCRIPTION OF SYMBOLS 10 ... Detector 18 ... Subject 14 ... Gantry as detector support 20 ... Bed 22 ... Detector holding arm 24 ... Weights 32a, 32b ... Rails 34, 36 ... Slide guides 38a, 38b ... Tension wire 40 ... Drive device .

Claims (2)

[Scope of utility model registration request] 1. A detector support base for supporting a detector for detecting radiation emitted from a subject and forming an image of information in the subject, and a rail provided on the detector support base. A detector holding arm attached in a movable state,
A weight that is movably mounted on the rail and balances with the detector, a loop-shaped tension wire that is disposed on the detector support base and is rotatable, and a drive device that drives the tension wire. And, the detector and the weight are connected to the tension wire so as to move in mutually different directions, and the detector is driven in the direction perpendicular to the body axis of the subject by driving the tension wire. A scintillation camera characterized by being moved. 2. The scintillation camera according to claim 1 for utility model registration, wherein the cable is a chain.