JPH03972Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cradle used in an X-ray tomography apparatus.

(Prior Art) FIG. 3 is a configuration diagram showing an example of a main part of an X-ray tomography apparatus. In FIG. 3, reference numeral 1 denotes a scanning gantry, in which a tunnel is formed into which a subject (patient) 2 is sent. There is an X inside this tunnel.
A radiation source 3 and a detector 4 are arranged opposite to each other so as to be rotatable. Reference numeral 5 denotes a cradle on which the subject 2 is placed and sent into the tunnel of the scanning gantry 1, and is supported by a cantilever on the table surface 7 of the table body 6 so as to be movable in the reciprocating direction with respect to the scanning gantry 1. installed.

In such a configuration, when focusing on the cradle 5, a large bending moment will be applied when it is sent into the tunnel of the scanning gantry 1 with the subject 2 placed thereon, so it is necessary to increase its rigidity and strength. be. However, on the other hand, since the cradle 5 may be torn apart along with the subject 2, if only the rigidity and strength are increased, the cradle 5 will absorb the X-rays that have passed through the subject 2 and contain useful information. , this may lead to a decrease in the S/N ratio. Therefore, the cradle 5 needs to have a structure that absorbs little X-rays and has high rigidity and strength.

FIG. 4 is a block diagram showing an example of such a conventional cradle 5. As shown in FIG. In FIG. 4, reference numeral 51 denotes a hollow cradle body made of carbon fiber having high composition and high strength and formed into a crescent-shaped cross-section. A foamed resin 52 such as foamed urethane or the like is filled. 5
Reference numeral 3 denotes a mat made of urethane sponge or the like provided on the surface of the cradle main body 51 facing the subject 2.

(Problem to be solved by the invention) The cradle 5 constructed in this way has an aluminum equivalent weight of 1 to 2 mm for transmitting X-rays, and a maximum load of 136 mm.
Can bear Kg. However, since the cradle main body 51 is made of carbon fiber, there is a drawback that the cost is high.

This invention was made in view of the above points,
The purpose is to provide low cost, high rigidity and strength,
The object of the present invention is to realize a cradle with excellent characteristics that absorbs little X-rays.

(Means for Solving the Problems) The present invention to solve the above problems forms a cradle body having a flat cross-sectional shape with a hollow thin-walled pipe containing aluminum, and fills the hollow thin-walled pipe with foamed resin. It is characterized by the fact that

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which a is a plan view, b is a side view, and c is a sectional view taken along line A--A in a. In FIG. 1, 54 is a cradle main body, which is a hollow thin-walled pipe made of aluminum or aluminum alloy and has a flat cross-sectional shape. The hollow thin-walled pipe 5
The inside of 4 is filled with foamed resin 55 such as foamed urethane. A component attachment plate 56 for fixing the head of the subject is fixed to one end of the cradle body 54, and a plurality of attachment holes 57 are provided near the other end for attachment to a carriage (not shown) for moving the cradle body 54. is provided.

In such a configuration, when the subject 2 is placed on the cradle 5 and sent into the tunnel of the scanning gantry 1 as shown in FIG.
A large bending moment acting on the cradle body 54 will be applied to the cradle body 54, and the foamed resin 55 will prevent changes in the cross-sectional shape in the thickness direction caused by bending. Most of the X-rays are absorbed by the cradle body 54. here,
The amount of X-ray absorption is determined by the wall thickness of the hollow thin-walled pipe forming the cradle body 54. For example, when the wall thickness is 1 mm, the aluminum equivalent is approximately 2 mm.

With this configuration, a cradle having substantially the same characteristics as the conventional configuration in which the cradle main body 51 is formed of carbon fiber as shown in FIG. 4 can be realized, and the cost can be significantly reduced.
Further, since the surface of the cradle main body 54 facing the subject is a flat surface, an RTP pad is not required.

FIG. 2 is a block diagram showing another embodiment of the present invention, and the same parts as in FIG. In FIG. 2, an area A through which X-rays are transmitted is formed by filling the inside of a hollow thin-walled pipe 54 with foamed resin 55, as shown in the cross-sectional shape shown in FIG. about
It has a structure with high strength and rigidity that is different from the AA section. The structure of such a part B may be, for example, using non-foamed resin as a filling material inside the hollow thin-walled pipe, or forming the entire part B by casting or machined metal, or forming the inside of a hollow thin-walled pipe like part A. It is sufficient to provide reinforcing ribs.

In the above embodiments, the cradle main body is flat with a trapezoidal cross-sectional shape, but is not limited to this, and may be flat with a rectangular shape, for example.

(Effects of the Invention) As described above, according to the present invention, a cradle for an X-ray tomography apparatus can be realized at low cost, with high rigidity and strength, and with excellent characteristics of absorbing little X-rays.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figures are block diagrams showing other embodiments of the present invention, FIG. 3 is a block diagram showing an example of essential parts of an X-ray tomography apparatus, and FIG. 4 is a block diagram showing an example of a conventional cradle. 5... Cradle, 54... Cradle body (hollow thin wall pipe), 55... Foamed resin, 56...
Parts mounting plate, 57...Mounting hole.

Claims (1)

[Scope of utility model registration request] A cradle for an X-ray tomography apparatus, characterized in that a cradle body having a flat cross-sectional shape is formed of a hollow thin-walled pipe containing aluminum, and the hollow thin-walled pipe is filled with foamed resin.