JPH0417127Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a gantry for a radiation tomography apparatus that irradiates a subject with radiation and detects projection data. This invention relates to improvements in the opening and closing mechanism of.

(Prior Art) A gantry for a radiation tomography apparatus disclosed in Utility Model Application Publication No. 154909/1983 has been known. The gantry 1
As shown in FIG.
It is installed substantially perpendicular to the longitudinal direction (of the top plate of the subject mounting table 3). Inside the housing of the gantry 1, X-rays from an X-ray tube 4 are converted into a fan beam 6 by a collimator 5 and delivered to a subject 7 (the subject 7 is inserted into a cylindrical opening 8 by a cradle 2). An X-ray irradiation unit 9 that irradiates, a detection unit 10 that detects the X-rays that have passed through the subject 7, and the X-ray irradiation unit 9 and detection unit 10 are integrated and rotated along the circumferential surface of the opening 8. A rotation drive means (not shown) (scans the subject 7), a tilt mechanism (not shown) that tilts the gantry itself forward or backward with respect to the insertion direction X of the subject 7, and figure),
A control circuit (not shown) is installed to operate the cradle 3, rotation drive means, etc. On the other hand, the housing of the gantry 1 is constructed by fixing a U-shaped cover 12 to a rectangular base frame 11, as shown in FIG.
A front cover 13 and a rear cover 14 are engaged with this. The U-shaped cover 12 is a side cover 12 fixed to the base frame 11.
a and 12b, and side covers 12a and 12b
and a top cover 12c coupled to the top cover 12c.

In the gantry housing, the front cover 13 or the rear cover 14 is connected to the U-shaped cover 12.
Since the casing can be opened by removing it from the casing, it is convenient for performing maintenance and inspection work on each device installed inside the casing.

By the way, the length and width of the front cover and rear cover are generally around 2m, and the depth is 30~30m.
It is 50cm. Also, the weight of the front cover and rear cover is 20 to 40 kg.

(Problems to be solved by the invention) Therefore, in the case of the gantry of conventional radiation tomography equipment, it is not only difficult to attach and remove the front cover or rear cover by one person, but also from the safety point of view. There was a problem. For this reason, there was a problem that maintenance and inspection work was difficult to perform.

This invention was made in view of the above,
The purpose is to provide a gantry for a radiation tomography apparatus that allows easy maintenance and inspection work.

(Means for Solving the Problems) The gantry of the radiation tomography apparatus of the present invention that achieves the above object has an upper part supported by the main body of the gantry, and a front cover that opens and closes by rotating the lower part by raising and lowering it. , and a rear cover that is supported by the main body of the gantry and can be opened and closed by horizontal movement in the longitudinal direction of the cradle.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In Figure 1, the dash-dotted line shows the closed state of the gantry cover (table 3 is at the height at the time of photographing), and the solid line shows the opened state (table 3 can be lowered in the direction of arrow A). (as far away from the gantry as possible). In addition, the frame 21 is a main part that constitutes a tilt mechanism that tilts the gantry itself forward or backward; here, the gantry 1
It symbolizes the main body of. The front cover 22 is supported by the frame 21 via a hinge mechanism (not shown), and is configured to open and close by rotating in the direction of arrow B about a fulcrum 23. The gas spring 24 has a case part attached to the frame 21,
Further, the movable parts are respectively coupled to the front cover 22, and the front cover 22 is held at an arbitrary position. The rear cover 25 is supported by the frame 21 via a slide lever 26 and horizontally moves in the direction of arrow C. That is, the main body of the slide lever 25 is fixed to the frame 21, and the movable part moves the rear cover 25.
support. As a result, the rear cover 25 moves in the longitudinal direction of the table 3 (cradle) to open and close the cover.

As shown in FIG. 2 (a front view of the front cover 22), the front cover 22 has a portion cut out at the bottom to avoid contact with the table 3 when the front cover 22 rotates. ing.

In the above configuration, the front cover 22 can be opened and closed by raising and lowering the lower part of the front cover 22 (rotating the lower part). Further, the rear cover 25 can be opened and closed by horizontally moving the cradle in the longitudinal direction. Since both covers are supported by the main body of the gantry, the opening and closing operations described above can be performed by one person.

Incidentally, in the present invention, there is no need to limit the supporting positions or supporting means of the front cover and the rear cover.

(Effect of the invention) As explained above, according to the gantry of the radiation tomography apparatus of the invention, the upper part is supported by the main body of the gantry, and the front cover is opened and closed by rotating the lower part by raising and lowering the gantry. The front cover and the rear cover can be easily opened and closed by one person because the cradle is supported by the main body and is opened and closed by horizontal movement of the cradle in the longitudinal direction. Therefore, maintenance and inspection of the gantry becomes easier.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a block diagram of a front cover in an embodiment of the present invention, FIG. 3 is a block diagram showing the gantry and surroundings of a radiation tomography apparatus, and FIG. 4 is a block diagram showing a conventional example. 1... Gantry, 2... Cradle, 3...
Table, 4...X-ray tube, 5...Collimator, 9
... X-ray irradiation section, 10 ... detection section, 11 ... base frame, 12 ... U-shaped cover, 13,
22... Front cover, 14, 25... Rear cover, 23... Front cover rotation fulcrum, 24
...Gas spring, 26...Slide lever.

Claims (1)

[Scope of Claim for Utility Model Registration] In a gantry for a radiation tomography apparatus, which is a housing that occupies a substantially rectangular parallelepiped space and is installed with its front surface substantially perpendicular to the longitudinal direction of the cradle of the subject mounting table, A front cover whose upper part is supported by the main body of the gantry and which is opened and closed by rotating the lower part by raising and lowering it; and a rear cover which is supported by the main body of the gantry and which is opened and closed by horizontal movement in the longitudinal direction of the cradle. A gantry for a radiation tomography apparatus comprising: