JP2008000247A - Top plate for x-ray imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve rigidity and to suppress increase in X-ray absorption. <P>SOLUTION: A cradle 10 has such a structure that a core material 11 made of resin foam is covered with an exterior 20 including two or more CFPR layers. At the upper surface part of the exterior 20, a CFRP layer is laminated without inserting a resin film. At the bottom surface part of the exterior 20, a resin film is inserted and laminated between the CFPR layers. Consequently, regarding the bottom surface which supports the weights of the patient and the cradle 10, the resin film which is more inexpensive than the CFRP layer is inserted between the CFRP layers, so that the number of the CFRP layers required for obtaining desired rigidity (thickness) is reduced to reduce costs. Moreover, since no resin film is inserted between the CFRP layers of the upper surface, the increase in X-ray absorption is reduced compared with a structure of inserting a resin film between the CFRP layers of the upper surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a top plate for an X-ray imaging apparatus, and more particularly to a top plate for an X-ray imaging apparatus that increases rigidity and suppresses an increase in X-ray absorption.

2. Description of the Related Art Conventionally, a medical device top plate having a structure in which a plurality of FRP (Fiber Reinforced Plastic) layers are laminated on a core material is known (see, for example, Patent Document 1 and hereinafter referred to as Prior Art 1).
Further, there is known an FRP structure in which an FRP layer is laminated on a thermoplastic resin foam layer, and a sheet-like resin layer is laminated on the FRP layer (see, for example, Patent Document 2; hereinafter referred to as Prior Art 2). ).
Japanese Patent Laid-Open No. 2004-216021 JP 2006-35671 A

By the way, in the top plate for medical devices, high strength has been demanded due to the recent expansion of the scanning range and the necessity of dealing with patients with heavy weight.
In the case where only the FRP layer is laminated on the core material such as the top plate for the medical device of the above prior art 1, the thickness can be increased by increasing the number of FRP layers to obtain a desired strength. Although it can be considered, there is a problem of high cost.
In addition, regarding the structure of the top plate in which the core material is covered with the laminate of the FRP layer and the sheet-like resin according to the above-described prior art 2, it is considered that the thickness of the laminate is increased and the strength can be increased. In addition, it is considered that the number of FRP layers necessary for obtaining a desired strength is small, and it is possible to suppress an increase in cost. However, there is a problem that X-ray absorption increases.
Therefore, an object of the present invention is to provide a top plate for an X-ray imaging apparatus that increases the strength and suppresses an increase in X-ray absorption.

In a first aspect, the present invention is a top plate for an X-ray imaging apparatus in which two or more FRP layers are laminated on a core material, and the FRP layer is laminated on the upper surface without sandwiching a sheet-like resin. A top plate for an X-ray imaging apparatus is provided in which the bottom surface is laminated with a sheet-like resin sandwiched between FRP layers.
In the top plate for an X-ray imaging apparatus according to the first aspect, a sheet-like resin layer that is less expensive than the FRP layer is sandwiched between the FRP layer on the bottom surface that supports the load of the subject and the top plate itself. Therefore, the number of FRP layers required to obtain the rigidity (thickness) can be reduced, and the cost can be reduced. Furthermore, since the sheet-like resin is not sandwiched between the FRP layers on the upper surface, an increase in X-ray absorption can be suppressed as compared with a structure in which the sheet-like resin is also sandwiched between the FRP layers on the upper surface.

In a second aspect, the present invention provides the top plate for an X-ray imaging apparatus according to the first aspect, wherein the FRP layer is made of cloth and resin. .
In the top plate for an X-ray imaging apparatus according to the second aspect, since a cross is used, it is easier to control the rigidity than a structure in which layers made of a plurality of parallel carbon fibers are orthogonally stacked.

In a third aspect, the present invention provides the top plate for an X-ray imaging apparatus according to the second aspect, wherein the cloth is a carbon fiber cloth.
In the top plate for an X-ray imaging apparatus according to the third aspect, since carbon fiber cloth is used, light and sufficient strength can be obtained.

In a fourth aspect, the present invention relates to the top plate for an X-ray imaging apparatus according to the second or third aspect, wherein the outermost surface of the bottom surface is an FRP layer, and the unevenness of the cross eye is on the surface. A characteristic top plate for an X-ray imaging apparatus is provided.
In the top plate for an X-ray imaging apparatus according to the fourth aspect, appropriate sliding and friction can be obtained between the roller supporting the bottom surface.

In a fifth aspect, the present invention provides the X-ray imaging apparatus according to any one of the first to fourth aspects, wherein the sheet-like resin is a resin film. Provide a top board.
The top plate for an X-ray imaging apparatus according to the fifth aspect uses a resin film that has no voids as viewed from the outer diameter of the fibers in the FRP layer, and therefore varies in thickness due to the unevenness of the fiber overlap in the FRP layer. Can be suppressed.

In a sixth aspect, the present invention provides the top plate for an X-ray imaging apparatus according to the fifth aspect, wherein the resin film is made of a polyester film or PET. .
Since the top plate for an X-ray imaging apparatus according to the sixth aspect uses a polyester film or PET, it can be lightly and effectively reinforced.

In a seventh aspect, the present invention provides the X-ray imaging apparatus according to any one of the first to sixth aspects, wherein the core material is a resin foam. Provide a top board.
In the top plate for an X-ray imaging apparatus according to the seventh aspect, since a resin foam is used for the core material, the weight can be reduced.

  In an eighth aspect, the present invention provides an X-ray imaging apparatus top plate according to any one of the first to seventh aspects, wherein the X-ray imaging apparatus top plate is an X-ray CT apparatus table apparatus. A top plate for an X-ray imaging apparatus, characterized by being a cradle.

  According to the top plate for an X-ray imaging apparatus of the present invention, since the sheet-like resin layer that is less expensive than the FRP layer is sandwiched between the FRP layers on the bottom surface that supports the load of the subject and the top plate itself, The number of FRP layers required to obtain rigidity (thickness) is small, and a high-strength top plate can be obtained while suppressing high costs. Furthermore, since the sheet-like resin is not sandwiched between the FRP layers on the upper surface, an increase in X-ray absorption can be suppressed as compared with a structure in which the sheet-like resin is also sandwiched between the FRP layers on the upper surface.

   Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.

FIG. 1 is a configuration diagram illustrating an X-ray CT apparatus 100 according to the first embodiment.
The X-ray CT apparatus 100 includes an operation console 1, a table device 8, and a scanning gantry 9.

  The operation console 1 includes an input device 2 that receives input from an operator, a central processing unit 3 that executes image reconstruction processing, a data collection buffer 5 that collects projection data acquired by the scanning gantry 9, and a projection data. A CRT 6 that displays a reconstructed X-ray CT image and a storage device 7 that stores programs, data, and X-ray CT images are provided.

  The table device 8 includes a cradle 10 that carries a subject and puts it in and out of a bore (cavity) of the scanning gantry 9. The cradle 10 is moved up and down and linearly moved by a motor built in the table device 8.

  Although not shown, the scanning gantry 9 includes an X-ray tube, an X-ray controller, a collimator, an X-ray detector, a DAS (Data Acquisition System), and a rotary controller that controls the X-ray controller, collimator, and DAS. And a control controller that exchanges control signals and the like with the operation console 1 and the imaging table 10, and a slip ring.

  As shown in FIG. 2, the bottom surface of the cradle 10 is supported by a roller 8 r of the table device 8. Therefore, the body weight of the subject K and the weight of the cradle 10 are concentrated on a small area portion of the bottom surface of the cradle 10 that is in contact with the roller 8r.

  As shown in FIG. 3, the cradle 10 has a structure in which a core 11 made of resin foam is covered with an exterior 20 including two or more CFRP layers.

  As shown in FIG. 4, the outer casing 20 on the bottom surface of the cradle 10 has a core material 11 laminated with a CFRP layer 12a made of carbon fiber cloth and resin, and a resin film 13a laminated on the CFRP layer 12a. A CFRP layer 12b is laminated on the film 13a, a resin film 13b is laminated on the CFRP layer 12b, a CFRP layer 12c is laminated on the resin film 13b, a resin film 13c is laminated on the CFRP layer 12c, and the resin film 13c Are laminated with a CFRP layer 12d.

The CFRP layers 12a, 12b,... Are made of carbon fiber cloth and epoxy resin.
The resin films 13a, 13b,... Are, for example, polyester or PET films that do not have voids that allow carbon fiber cloth yarns to enter.

  In the FRP structure in which the resin film is sandwiched between the CFRP layers, even when the positions of the intersections of the warp and weft of the carbon fiber cloth in each CFRP layer overlap as shown in FIG. 5, each CFRP layer as shown in FIG. Even when the position of the intersection of the warp and weft of the carbon fiber cloth is shifted, the thickness becomes substantially uniform. This ensures that the expected thickness or stiffness is always obtained. Therefore, even if the weight of the subject K and the weight of the cradle 10 are concentrated on a small area of the cradle 10 that is in contact with the roller 8r, the cradle 10 can withstand this. That is, if the rigidity of the bottom surface of the cradle 10 is low, the roller 8r is pushed into a small area portion of the bottom surface of the cradle 10, and there is a risk that the cradle 10 may be damaged due to buckling of the cradle 10. The risk can be reduced.

  The outermost CFRP layer 12d on the bottom surface of the cradle 10 has unevenness on the surface. This is to obtain appropriate slip and friction with the roller 8r.

  As shown in FIG. 7, the outer casing 20 on the upper surface of the cradle 10 has a core material 11 laminated with a CFRP layer 12a made of carbon fiber cloth and resin, and a CFRP layer 12b laminated on the CFRP layer 12a. A CFRP layer 12c is laminated on the layer 12b, and a CFRP layer 12d is laminated on the CFRP layer 12c.

  In the FRP structure in which only the CFRP layer is stacked without sandwiching the resin film, the position of the intersection of the warp and the weft of the carbon fiber cloth in each CFRP layer overlaps as shown in FIG. 8, and each CFRP as shown in FIG. In the case where the position of the intersection of the warp and weft of the carbon fiber cloth of the layer is shifted, the latter is thinner than the former. This is because, in the latter case, the intersection of the warp and weft of the carbon fiber cloth enters the gap where there is no warp or weft. And if it becomes thin like the latter, rigidity like the former cannot be obtained. However, on the upper surface of the cradle 10, the weight of the subject K is not concentrated on a small area, so that no trouble occurs.

  According to the cradle 10 according to the first embodiment, since the resin film 13 that is less expensive than the CFRP layer 12 is sandwiched between the CFRP layer 12 on the bottom surface that supports the load of the subject K and the cradle 10, a desired rigidity ( The number of CFRP layers 12 required to obtain (thickness) is small, and a high-strength top plate can be obtained while suppressing high costs. Furthermore, since the resin film 13 is not sandwiched between the CFRP layers 12 on the upper surface, an increase in X-ray absorption can be suppressed as compared with a structure in which the resin film 13 is also sandwiched between the CFRP layers 12 on the upper surface.

  The top plate for an X-ray imaging apparatus of the present invention can be used for, for example, an X-ray CT apparatus.

1 is a configuration diagram illustrating an X-ray CT apparatus according to Embodiment 1. FIG. 3 is a schematic diagram illustrating a cradle support mechanism according to Embodiment 1. FIG. 1 is a cross-sectional view showing a cradle according to Example 1. FIG. It is a disassembled perspective view which shows the FRP structure of the bottom face of the cradle concerning Example 1. FIG. It is explanatory drawing which shows the thickness of the FRP structure of the bottom face of a cradle when the intersection position of the carbon fiber cloth of each CFRP layer overlaps. It is explanatory drawing which shows the thickness of the FRP structure of the bottom face of a cradle when the intersection position of the carbon fiber cloth of each CFRP layer has shifted | deviated. It is a disassembled perspective view which shows the FRP structure of the upper surface of the cradle concerning Example 1. FIG. It is explanatory drawing which shows the thickness of the FRP structure of the upper surface of a cradle in case the intersection position of the carbon fiber cloth of each CFRP layer has overlapped. It is explanatory drawing which shows the thickness of the FRP structure of the upper surface of a cradle when the intersection position of the carbon fiber cloth of each CFRP layer has shifted | deviated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation console 8 Table apparatus 9 Scanning gantry 10 Cradle 11 Core material 12a, 12b, ... CFRP layer 13a, 13b, ... Resin film 20 Exterior 100 X-ray CT apparatus

Claims (8)

A top plate for an X-ray imaging apparatus in which two or more FRP layers are laminated on a core material, and the upper surface is laminated without the sheet-shaped resin sandwiched between the FRP layer and the bottom surface is a sheet between the FRP layers. A top plate for an X-ray imaging apparatus, characterized by being laminated with a resin in between. 2. The top plate for an X-ray imaging apparatus according to claim 1, wherein the FRP layer is made of cloth and resin. The top plate for an X-ray imaging apparatus according to claim 2, wherein the cloth is a carbon fiber cloth. 4. The top plate for an X-ray imaging apparatus according to claim 2, wherein the outermost surface of the bottom surface is an FRP layer, and the unevenness of the cross eye is on the surface. . The top plate for an X-ray imaging apparatus according to any one of claims 1 to 4, wherein the sheet-like resin is a resin film. 6. The top plate for an X-ray imaging apparatus according to claim 5, wherein the resin film is made of a polyester film or PET. The top plate for an X-ray imaging apparatus according to any one of claims 1 to 6, wherein the core material is a resin foam. 8. The X-ray imaging apparatus top plate according to claim 1, wherein the X-ray imaging apparatus top panel is a cradle of a table device of an X-ray CT apparatus. Top plate for photography equipment.

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