JPH0562208U - Cradle for X-ray tomography system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cradle for an X-ray tomography apparatus capable of ensuring a safe and stable imaging state and reducing the amount of X-ray absorption. [Structure] X formed by coating a core material with carbon fiber to form a plate
In a cradle for a line tomography apparatus, it is composed of an upper skin portion made of carbon fiber having high tensile elastic modulus and tensile strength, and a lower skin portion made of carbon fiber having high compressive elastic modulus and compressive strength.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cradle for an X-ray tomography apparatus, and more particularly to improving the amount of X-ray absorption in the cradle.

[0002]

[Prior Art]

 FIG. 3 is a block diagram of a known X-ray tomography apparatus (hereinafter referred to as X-ray CT apparatus). As shown in FIG. 3, the X-ray CT apparatus includes a gantry 3 that supports the X-ray source 1 and the detector 2 with the subject 4 interposed therebetween, and a cradle 5 on which the subject 4 is placed. The ladle 5 includes a table 6 which constitutes the sliding surface of the ladle 5, a photographing table 8 including a main body 7 which supports the table 6, and an operator console 11 including a CRT 9, a photographing operation unit 10, a central control unit (not shown) and the like. Have. The cradle 5 has a plate-like shape in which a resin foam material is used as a core material, and the periphery thereof is covered with a carbon fiber having a high elastic modulus and a high strength. That is, the upper and lower skins of the cradle 5 and the skins on both sides are made of carbon fibers having the same characteristics.

In the above structure, the cradle 5 has a large rigidity, a large strength and the like in the longitudinal direction due to the mechanical characteristics of the carbon fiber such as the high elastic modulus and the high strength. Therefore, at the time of photographing, the cradle 5 is cantilevered at a predetermined position as shown in FIG. It is possible to realize a safe and stable state without causing a problem.

[0004]

[Problems to be solved by the device]

 By the way, at the time of imaging, X-rays are illuminated from the X-ray tube 1, pass through the subject 4, and reach the detector 2. Since the X-rays are detected after passing through the cradle 5 in this manner, it is inevitable that necessary information is absorbed by the cradle. On the other hand, in order to improve the image quality, it is necessary to suppress the amount of X-ray absorption in the cradle as much as possible. Generally, in order to reduce the absorption amount, the cradle may be formed of a member having a small X-ray absorption amount, and the thickness of the cradle may be made as thin as possible.

In consideration of the absorption amount and the mechanical strength, the conventional cradle has a resin foam material as a core material, an outer skin portion made of carbon fiber, and a safe thickness. At the same time, it is the minimum thickness required to obtain the mechanical strength to achieve stability (hereinafter referred to as the prescribed thickness).

However, in the conventional cradle, if the cradle is made thinner than a predetermined thickness, safe and stable imaging cannot be ensured. Therefore, the thickness should be reduced to reduce the X-ray absorption. There is a problem that is difficult.

The present invention has been made in view of the above, and the purpose thereof is to ensure a safe and stable imaging state and to reduce the amount of absorbed X-rays. Providing a cradle for equipment.

[0008]

[Means for solving problems]

 The cradle for an X-ray tomography apparatus of the present invention that achieves the above object is a cradle for an X-ray tomography apparatus in which a core material is coated with carbon fiber to form a plate shape. It is characterized by comprising an upper skin portion made of high carbon fiber and a lower skin portion made of carbon fiber having high compressive elastic modulus and compressive strength.

[0009]

[Action]

 In the above cradle for an X-ray tomography apparatus, in the cantilevered state of the cradle, a tensile force is applied to the upper skin portion and a compressive force is applied to the lower skin portion. Since the upper skin part is made of carbon fiber having high tensile elastic modulus and tensile strength, and the lower skin part is made of carbon fiber having high compressive elastic modulus and compressive strength, the rigidity and strength of the cradle are increased. It will be. Therefore, even if the thickness is reduced, it is possible to obtain a safe and stable shooting state. That is, a cradle having a predetermined thickness is realized. In addition, the amount of X-rays transmitted through the cradle is reduced by reducing the predetermined thickness.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. 1 and 2 are configuration diagrams showing an embodiment of the present invention. FIG. 1 is a perspective view of a cradle, and FIG. 2 is a transverse sectional view of a cradle central portion. The cradle 21 includes a core material 22 made of a resinous foam material, an upper skin portion 23 made of carbon fiber having high tensile elastic modulus and tensile strength, and a lower skin portion 24 made of carbon fiber having high compressive elastic modulus and compressive strength. And the thickness is about half that of the conventional example. The carbon fiber X1 of FIG. 4 is used as the upper skin portion 23, and the carbon fiber Y1 of FIG. 4 is used as the lower skin portion 24. Incidentally, in the conventional cradle, the upper skin portion and the lower skin portion are made of the same carbon fiber Y2. In this embodiment, the lower skin portion 24 is defined to include both side surfaces of the cradle 21.

In the above configuration, when the cradle is in a cantilever state, a tensile force is applied to the upper skin portion 23 and a compressive force is applied to the lower skin portion 24. Since the upper skin portion 23 is composed of the carbon fiber X1 having high tensile elastic modulus and tensile strength, and the lower skin portion 24 is composed of the carbon fiber Y1 having high compressive elastic modulus and compressive strength, the cradle 21 of Even though the thickness is about 1/2 of the conventional thickness, the mechanical strength can be obtained to the same level as the conventional one. That is, a safe and stable shooting state is realized. Further, since the predetermined thickness of the cradle 21 is about 1/2 of that of the conventional one, the X-ray absorption rate through the cradle 21 is reduced. According to the experiments conducted by the present inventors, in each of the examples in which the upper skin portion and the lower skin portion are respectively combined with the carbon fibers shown in Table 1, when the same rigidity as that of the conventional case is provided, X The amount of linear absorption is about 1/2. Further, when the X-ray absorption amount is suppressed to the same level as the conventional one, the rigidity is about double.

In the above embodiment, the lower skin portion 24 is configured to include the skin portions on both sides, but the bottom plate portion of the cradle and the skin portions on both sides are made of different members, and It is also possible to increase the physical strength.

[0013]

[Effect of the device]

 As described above, according to the cradle for an X-ray tomography apparatus of the present invention, the upper skin part is made of carbon fiber having high tensile elastic modulus and tensile strength, and the lower skin part is made of compressive elastic modulus and compressive strength. Since it is made of high carbon fiber, it is possible to reduce the predetermined thickness of the cradle. Therefore, it is possible to realize a cradle that secures a safe and stable imaging state and reduces the amount of X-ray absorption.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view of a cradle according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing an X-ray tomography apparatus.

FIG. 4 is a diagram showing a material of a skin portion.

[Explanation of symbols]

3 Gantry 5, 21 Cradle 8 Photographic stand 11 Operator console 22 Core material (foam material) 23 Upper skin part (carbon fiber having high tensile elastic modulus and high tensile strength) 24 Lower skin part (high compressive elastic modulus and high compression) Strong carbon fiber)

Claims (1)

[Scope of utility model registration request] 1. A cradle for an X-ray tomography apparatus, which comprises a core material coated with carbon fibers into a plate shape, and an upper skin portion made of carbon fibers having high tensile elastic modulus and tensile strength, and compression elastic modulus and compression. A cradle for an X-ray tomography apparatus, comprising a lower skin portion made of high-strength carbon fiber.