JPH0426087Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention consists of a structure in which both sides and the upper side of a means for irradiating a subject with radiation and detecting projection data are themselves rigid structures. The present invention relates to a gantry for a radiation tomography apparatus, which is covered with a U-shaped cover, and the front and rear sides of the means are covered with covers that are engaged with the U-shaped cover.

(Prior Art) As is well known, in the gantry of a radiation tomography apparatus, a means for irradiating a subject with radiation and detecting projection data, which will be described below, is arranged occupying a substantially rectangular parallelepiped space. It is structured as follows. As shown in FIG. 2, the gantry receives
An X-ray irradiation unit 7 that converts the beam into a fan beam 3 using a collimator 2 and irradiates the subject 4 (the subject 4 is inserted into a cylindrical opening 6 by a cradle 5).
and a detection unit 8 that detects the X-rays that have passed through the subject 4.
, a rotation driving means (not shown) that integrates the X-ray irradiation unit 7 and the detection unit 8 and rotates them along the circumferential surface of the opening 6 (scans the subject 4 ); A tilt mechanism (not shown) that tilts the gantry itself forward or backward with respect to the insertion direction X of the subject 4, and a control circuit (not shown, which can be operated on-site (It has a circuit configuration).

Conventionally, this type of gantry has a rotary drive means,
A mechanism in which the X-ray irradiation section, the detection section, etc. are held in predetermined positions by holding the tilt mechanism etc. to the base frame 11 made of square pipe shown in Fig. 3 using a connection frame, connection tools, etc. It is becoming.
Further, each of the above-mentioned components is surrounded by a substantially rectangular parallelepiped cover frame 14 made up of square pipes 12, 13, etc. that are supported directly or indirectly on the base frame 11, and reinforcements attached to the cover frame 12. It is shielded from the outside by a front cover 15, a rear cover 16, side covers 17, 18, and a top cover 19 made of plastic. A control circuit is also attached to the cover frame 12.

In the above configuration, the cover frame 14
is firmly constructed with square pipes 12, 13, etc., and serves as a stable attachment part for the cover. Thereby, the projection data detection means is stably and reliably shielded from the surroundings.

(Problems to be Solved by the Invention) However, in the gantry of the conventional radiation tomography apparatus, the means for shielding the projection data detection means from the outer enclosure is the cover frame 14 made of square pipe.
and covers 15 to 19,
There was a problem that the weight of the gantry was increased and the cost was increased. In addition, maintenance and inspection of the X-ray tube 1 and the detection unit 8 are performed by removing the specified covers, but since they are surrounded by a rigid cover frame 14, maintenance and inspection work is difficult to perform. It was rough.

(Means for solving the problem) The present invention was made in view of the above,
The purpose is to provide a gantry for a radiation tomography apparatus that is lightweight, low-cost, and allows easy maintenance and inspection work.

The gantry of the radiation tomography apparatus of the present invention that achieves the above object has a U-shaped structure in which both sides and the upper side of the means for irradiating the subject with radiation and detecting projection data are themselves rigid structures. The device is covered with a cover, and the front and rear sides of the means are covered with covers that lock onto the U-shaped cover.

(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 this embodiment as well, as explained in FIGS. 2 and 3, the means for detecting projection data consisting of a radiation irradiation section, a detection section, etc. (omitted in FIG. 1) is a rectangular shape. It is arranged on the base frame 11 to occupy a substantially rectangular parallelepiped space.
The feature of this embodiment is that a U-shaped cover 21 is provided on both sides (surfaces aligned in the same direction as the short axis direction of the base frame 11) and on the upper side of the main part of the projection data detection means.
The front cover 22 and the rear cover 23 are locked to the cover 21 to shield the main part of the projection data detection means from the outer surroundings. The U-shaped cover 21 is attached to the base frame 1
1 or side covers 21a and 21b held by a frame (not shown) holding projection data detection means, and a top cover 21c coupled to the side covers 21a and 21b.
Further, the side covers 21a, 21b and the top cover 21c have a predetermined mechanical strength and constitute a solid structure (U-shaped cover) that maintains the U-shape formed, and the mounting plate of the control circuit It also has the function of In the example of FIG. 1, the control circuit 2
4 is attached by connecting an operation surface to an opening formed by cutting out a part of the plate surface of the side cover 21a (the operation surface of the control circuit faces outward).

In the above configuration, since the U-shaped cover 21 constitutes a part of the gantry structure,
Stable shielding of the projection data detection means is ensured even without a cover frame. Also, each cover and
Since there is no cover frame between the wire tube and the detection section, maintenance and inspection work by removing the cover is facilitated.

Note that the present invention does not limit the U-shaped cover to the above embodiment. For example, it may be molded from a synthetic resin with high strength. Alternatively, the elongated member may be U-shaped.

(Effect of the invention) As explained above, according to the gantry of the radiation tomography apparatus of the invention, the U-shaped first cover, which is itself a solid structure, is held by the base frame, etc. Since both sides and the upper side of the projection data detection means are covered, and the front and rear sides of the means are covered by the second and third covers that are engaged with the first cover, a cover frame is no longer necessary. Therefore, the weight and cost of the gantry can be reduced. In addition, the second and third covers can be easily removed at the same time while the first cover is held on the base frame etc. (leaving the first cover independent), so maintenance can be done from either the front or the rear. Inspection work can be performed easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a conceptual block diagram of a gantry of a radiation tomography apparatus, and FIG. 3 is a block diagram showing a conventional example. 1... X-ray tube, 2... Collimator, 5... Cradle, 6... Opening, 7... X-ray irradiation section, 8...
Detection unit, 11... Base frame, 14... Cover frame, 21... U-shaped cover, 21
a and 21b...Side cover, 21c...Top cover, 22...Front cover, 23...Rear cover, 24...Control circuit.

Claims (1)

[Scope of utility model registration request] In the gantry of a radiation tomography apparatus, a means for irradiating a subject with radiation and detecting projection data is arranged occupying a substantially rectangular space. It is a solid structure that maintains the shape of the character, and includes a base frame,
or a first cover that is held on a frame that holds the projection data detection means and is installed so as to occupy a substantially rectangular parallelepiped space and cover both sides and an upper side of the projection data detection means; and a plate surface. The cover has an opening for inserting a subject into the cover, and includes second and third covers that are engaged with the first cover and are installed to cover the front and rear sides of the projection data detection means. . A gantry for a radiation tomography apparatus, characterized in that the projection data detection means is shielded from an outer surrounding.