JP2007159799A - X-ray ct apparatus - Google Patents

X-ray ct apparatus Download PDF

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JP2007159799A
JP2007159799A JP2005359732A JP2005359732A JP2007159799A JP 2007159799 A JP2007159799 A JP 2007159799A JP 2005359732 A JP2005359732 A JP 2005359732A JP 2005359732 A JP2005359732 A JP 2005359732A JP 2007159799 A JP2007159799 A JP 2007159799A
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ray
cylindrical
fiber
disk
rotating part
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JP2007159799A5 (en
JP4686352B2 (en
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Masaaki Iwasa
正明 岩佐
Hirohisa Enomoto
裕久 榎本
Shigeru Sakamoto
茂 坂本
Mikio Mochitate
幹雄 持立
Yasushi Miyazaki
宮崎　　靖
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Hitachi Healthcare Manufacturing Ltd
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Hitachi Medical Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus having a rotation part that is equipped with devices such as an X-ray tube, detector to a fixed part, whose rotation part weight is reduced for reducing a centrifugal force on the rotation part because the centrifugal force is proportional to the weight when the rotation part operates at a high speed. <P>SOLUTION: The X-ray CT apparatus includes a rotary table of a composite material composed of fiber and resin. The composite material is an anisotropic material with high rigidity and strength in a fiber direction, but also with reduced rigidity and strength in a direction perpendicular to the fiber direction, accordingly, the fiber direction is significant in manufacturing. The rotary table is manufactured so that the fiber could be radially arranged and layered for reducing radial distortion. Additionally, circumferential fibers are arranged on the outermost layer of a drum for reducing the radial distortion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はＸ線ＣＴ装置に関するものである。   The present invention relates to an X-ray CT apparatus.

従来のＸ線コンピュータ断層撮影装置（以下、Ｘ線ＣＴ装置という）として、例えば特許文献１がある。
この特許文献１は、架台回転部は架台固定部に対し、回転可能なように配置されている。架台回転部には種々の装置が固定されている。この回転部は円筒形状になっていて、回転により発生する遠心力に対して、搭載装置を強固に支持する構成となっている。回転速度が速くなったとき、遠心力は角加速度の２乗で増大するので、回転部にかかる遠心力を小さくするためには、回転部の重量を軽くする必要がある。 As a conventional X-ray computed tomography apparatus (hereinafter referred to as an X-ray CT apparatus), for example, there is Patent Document 1.
In this patent document 1, the gantry rotating part is arranged so as to be rotatable with respect to the gantry fixing part. Various devices are fixed to the gantry rotating unit. The rotating part has a cylindrical shape and is configured to firmly support the mounting device against centrifugal force generated by rotation. When the rotational speed increases, the centrifugal force increases as the square of the angular acceleration. Therefore, in order to reduce the centrifugal force applied to the rotating part, it is necessary to reduce the weight of the rotating part.

しかし、この回転部の材質に対する記述はなく、一般的に金属材料を用いると考えられる。この回転部に繊維と樹脂からなら軽量である複合材料を用いるためには、繊維の積層構成が問題となる。また、回転部を複合材料で製作し、分割構造としたときには、締結構造が問題となる。   However, there is no description of the material of the rotating part, and it is generally considered that a metal material is used. In order to use a light-weight composite material made of fibers and resin for the rotating part, the laminated structure of the fibers becomes a problem. Further, when the rotating part is made of a composite material and has a divided structure, the fastening structure becomes a problem.

特開平９−５６７１０号公報JP-A-9-56710

Ｘ線ＣＴ装置では固定部に対し、回転部を有し、この回転部にはＸ線管や検出器等の装置が搭載される。回転部が高速で動作すると遠心力は質量に比例するため、回転部にかかる遠心力を小さくするためには、回転部の質量を小さくし、軽量化する必要がある。そのために、本発明は軽量で、高剛性、高強度な複合材料をＸ線ＣＴ装置の回転部に用いる。回転部が遠心力を受けたときに強くするための積層構成を提案する。また、複合材料を用いて回転盤を分割構造としたときの構造を提案するものである。   The X-ray CT apparatus has a rotating portion with respect to the fixed portion, and devices such as an X-ray tube and a detector are mounted on the rotating portion. When the rotating part operates at a high speed, the centrifugal force is proportional to the mass. Therefore, in order to reduce the centrifugal force applied to the rotating part, it is necessary to reduce the weight of the rotating part and reduce the weight. For this purpose, the present invention uses a lightweight, high-rigidity, high-strength composite material for the rotating part of the X-ray CT apparatus. We propose a layered structure to strengthen the rotating part when it receives centrifugal force. In addition, the present invention proposes a structure in which a rotating disk is divided into a structure using a composite material.

本発明の目的は、軽量で高剛性、高強度な回転盤を備えたＸ線ＣＴ装置を提供することにある。   An object of the present invention is to provide an X-ray CT apparatus provided with a lightweight, high-rigidity, high-strength rotating disk.

上記目的は、架台内部に取付けられた回転部と、この回転部を支持する固定部と、前記回転部を制御する制御部とを備え、前記回転部は円筒形状をし、この円筒形状部にはＸ線管や検出器等の搭載機器が固定したＸ線ＣＴ装置において、前記円筒部の中心部から遠い最外周面に円周方向の繊維を配置されていることにより達成される。   The object is provided with a rotating part mounted inside the gantry, a fixing part that supports the rotating part, and a control part that controls the rotating part, and the rotating part has a cylindrical shape. In an X-ray CT apparatus to which a mounted device such as an X-ray tube or a detector is fixed, this is achieved by arranging circumferential fibers on the outermost peripheral surface far from the center of the cylindrical portion.

また、上記目的は、前記円筒部と円盤部がなす角度を９０度より大きくしたことにより達成される。   The above object is achieved by making the angle formed by the cylindrical part and the disk part larger than 90 degrees.

また、上記目的は、繊維としては、カーボン、ガラス、アルミナ等を用いたことにより達成される。   The above object is achieved by using carbon, glass, alumina or the like as the fiber.

また、上記目的は、前記回転部を円盤と円筒に分割し、前記円盤と円筒の端部に金属部を有し、この金属部をボルトで締結することにより達成される。   The above-mentioned object is achieved by dividing the rotating part into a disk and a cylinder, having a metal part at the end of the disk and the cylinder, and fastening the metal part with a bolt.

本発明によれば、軽量で高剛性、高強度な回転盤を備えたＸ線ＣＴ装置を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the X-ray CT apparatus provided with the lightweight, highly rigid, and high intensity | strength rotating disk can be provided.

本発明の第１の実施例を図１乃至図５を用いて説明する。   A first embodiment of the present invention will be described with reference to FIGS.

図１は本発明に関わるＸ線ＣＴ装置の外観斜視図である。
図１において、Ｘ線ＣＴは架台１、寝台２、制御部３からなっている。架台１の中心には患者が入る穴１ａが設けられている。この穴１ａに寝台２が移動して患者が入ることができる。制御部３でＸ線ＣＴを操作する。 FIG. 1 is an external perspective view of an X-ray CT apparatus according to the present invention.
In FIG. 1, the X-ray CT includes a gantry 1, a bed 2, and a control unit 3. At the center of the gantry 1 is provided a hole 1a for the patient to enter. The bed 2 can move into the hole 1a to enter the patient. The controller 3 operates the X-ray CT.

図２は架台１の主な構成を示すための斜視図である。
図２において、架台内部には回転部４と固定部５があり、回転部４は固定部５により支持され、図１に示した制御部３によりコントロールされる。図２の回転部４は円筒形状をしたものであり、円筒部にはＸ線管４ａや検出器４ｂ等の搭載機器が固定されている。このように円筒形状にすることにより搭載機器に遠心力がかかったときにも、搭載機器と円筒部は強固な構造になる。 FIG. 2 is a perspective view illustrating the main configuration of the gantry 1.
In FIG. 2, there are a rotating unit 4 and a fixed unit 5 inside the gantry, and the rotating unit 4 is supported by the fixed unit 5 and controlled by the control unit 3 shown in FIG. The rotating part 4 in FIG. 2 has a cylindrical shape, and mounted devices such as an X-ray tube 4a and a detector 4b are fixed to the cylindrical part. By adopting such a cylindrical shape, even when a centrifugal force is applied to the mounted device, the mounted device and the cylindrical portion have a strong structure.

図３は回転部のみの斜視図である。
図４は図３のＡ−Ａ線断面図であり、円盤部の繊維方向を示す図ある。
図５は円筒部に搭載機器を固定する穴を示した斜視図である。
図３において、回転部４は円盤部６と円筒部７からなっていて、中心の穴６ａには軸受けが挿入される。一般的に、複合材料を製作するときはあらかじめ成形型を製作し、その上に繊維を所定の方向に配置して積層し、樹脂を用いて複合材料を製作する。円盤部６の繊維は半径方向８とする。繊維は軸方向に力がかかったときには変形が小さく、高い荷重まで耐えることができる。回転部の最外周端部を折り曲げて円筒状７に成形する。円筒部７の繊維方向は円周方向に垂直となるため、円周方向に変形することになる。 FIG. 3 is a perspective view of only the rotating part.
FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 and shows the fiber direction of the disk part.
FIG. 5 is a perspective view showing a hole for fixing the mounted device to the cylindrical portion.
In FIG. 3, the rotating part 4 comprises a disk part 6 and a cylindrical part 7, and a bearing is inserted into the central hole 6a. In general, when a composite material is manufactured, a mold is manufactured in advance, fibers are arranged in a predetermined direction and laminated, and a composite material is manufactured using a resin. The fiber of the disk part 6 is set to 8 in the radial direction. The fiber is less deformed when an axial force is applied and can withstand high loads. The outermost peripheral end of the rotating part is bent and formed into a cylindrical shape 7. Since the fiber direction of the cylindrical portion 7 is perpendicular to the circumferential direction, the cylindrical portion 7 is deformed in the circumferential direction.

そこで、図４に示すように円筒部７の中心部から遠い最外周面には円周方向９に繊維を配置しておく。このように繊維を配置することにより、円筒部７が円周方向に変形することを防止することができる。円筒部７と円盤部６がなす角度１０は９０度より少し大きくしておく。繊維と樹脂を積層後、型により圧力をかけるため、成形品を硬化後に離型させるためである。繊維としては、カーボン、ガラス、アルミナ等が用いられ、樹脂としてはエポキシ、不飽和ポリエステル、フェノール等が用いられる。このときの円筒部最外周面の繊維と樹脂は成形時にあらかじめ成形型の上に配置しておいて円筒部と一体で成形することが望ましいが、円筒部７を製作後に不飽和ポリエステル樹脂とガラス繊維をハンドレイアップ法などを用いて接着することもできる。   Therefore, as shown in FIG. 4, fibers are arranged in the circumferential direction 9 on the outermost peripheral surface far from the center of the cylindrical portion 7. By arranging the fibers in this way, the cylindrical portion 7 can be prevented from being deformed in the circumferential direction. An angle 10 formed by the cylindrical portion 7 and the disk portion 6 is set slightly larger than 90 degrees. This is because, after the fibers and the resin are laminated, pressure is applied by a mold, and the molded product is released after curing. Carbon, glass, alumina or the like is used as the fiber, and epoxy, unsaturated polyester, phenol or the like is used as the resin. At this time, it is desirable that the fiber and resin on the outermost peripheral surface of the cylindrical portion be placed on a mold in advance at the time of molding and molded integrally with the cylindrical portion. However, the unsaturated polyester resin and glass are formed after the cylindrical portion 7 is manufactured. The fibers can also be bonded using a hand layup method or the like.

次に、搭載機器の固定構造について説明すると、円筒部７には図５に示すように搭載機器固定用のねじを通すための穴１１を開けられている。この穴１１にねじを通して搭載機器を固定する。   Next, the mounting structure of the mounted device will be described. The cylindrical portion 7 is provided with a hole 11 for passing a screw for mounting the mounted device as shown in FIG. The mounted device is fixed through the screw through the hole 11.

搭載機器固定構造を他の実施例を示した図６を用いて説明する。
図６は円筒部７の部分断面図である。
図６において、繊維を積層するときに穴１１の位置に金属部材１２をあらかじめ配置しておく。この金属部材１２には貫通穴が開いているだけでもよいし、ねじ部があってもよい。繊維を樹脂で固めて複合材料を製作するときに金属部材１２を繊維、樹脂と一緒に固めてしまう。この金属部材１２にねじを通して搭載物を固定することができる。 The mounted device fixing structure will be described with reference to FIG. 6 showing another embodiment.
FIG. 6 is a partial cross-sectional view of the cylindrical portion 7.
In FIG. 6, the metal member 12 is arranged in advance at the position of the hole 11 when the fibers are laminated. The metal member 12 may have only a through hole or may have a threaded portion. The metal member 12 is hardened together with the fiber and the resin when the composite material is manufactured by hardening the fiber with the resin. The mounted object can be fixed to the metal member 12 through a screw.

搭載機器固定構造を他の実施例を示した図７を用いて説明する。
図７は円筒部７の部分断面図である。
図７において、本実施例は円筒部７にボルトを通すための貫通穴１１を開けておき、この穴１１にボルトを通し、搭載機器固定用の金属部材１３を円筒部７にねじ止めする。金属部材１３にはねじ１４を加工しておく。このときに円筒部７には実施例１のようにボルトを通す穴を開けておいておくだけでもよいし、繊維と樹脂を積層するときに金属部材を一緒に固めてもよい。搭載機器固定用の金属部材１３が円筒部と接する部分は円筒部の内径と同じ形状にする。この金属部材１３に搭載機器をボルトで固定するためのねじ１４を加工しておく。このように円筒部７に金属部材１３をねじ止めし、この金属部材１３に搭載機器をボルトで固定して、搭載機器の重量により発生する遠心力を金属部材の面で円筒部の複合材料に負荷する。このように複合材料に面で荷重を与えることで、ボルト穴の集中荷重を防ぐことができる The mounted device fixing structure will be described with reference to FIG. 7 showing another embodiment.
FIG. 7 is a partial cross-sectional view of the cylindrical portion 7.
In FIG. 7, in this embodiment, a through hole 11 for passing a bolt is made in the cylindrical portion 7, the bolt is passed through the hole 11, and the mounting member fixing metal member 13 is screwed to the cylindrical portion 7. The metal member 13 is processed with a screw 14. At this time, the cylindrical portion 7 may be simply provided with holes for passing bolts as in the first embodiment, or the metal members may be hardened together when the fibers and the resin are laminated. The part where the metal member 13 for fixing the mounted device is in contact with the cylindrical part has the same shape as the inner diameter of the cylindrical part. A screw 14 for fixing the mounted device to the metal member 13 with a bolt is processed. In this way, the metal member 13 is screwed to the cylindrical portion 7, and the mounted device is fixed to the metal member 13 with a bolt, and the centrifugal force generated by the weight of the mounted device is applied to the composite material of the cylindrical portion on the metal member surface. To load. By applying a load to the composite material in this way, concentrated loads on the bolt holes can be prevented.

次に本発明の他の実施例を図８乃至図１０を用いて説明する。
図８は、回転部の構成部品を展開した図である。
図８は本発明の他の実施例を備えた図である。
図９は円盤部の断面図である。
図８、図９において、回転部は円盤部６と円筒部７に分割され、さらに円筒部７は２つに分割されている。円盤部６の周方向端部には図９に示すように金属１９が接着されている。この金属１９にはねじ１５が加工されている。円盤部の表裏面には半径方向に金属１９の半径方向端部まで繊維１８がくるように配置される。このように金属部１９の表裏面に複合材料が接着されることにより、金属部１９と円盤部６は強固に接着される。 Next, another embodiment of the present invention will be described with reference to FIGS.
FIG. 8 is a developed view of the components of the rotating part.
FIG. 8 is a view provided with another embodiment of the present invention.
FIG. 9 is a cross-sectional view of the disk portion.
8 and 9, the rotating part is divided into a disk part 6 and a cylindrical part 7, and the cylindrical part 7 is further divided into two parts. As shown in FIG. 9, a metal 19 is bonded to the circumferential end of the disk portion 6. A screw 15 is processed on the metal 19. The fibers 18 are arranged on the front and back surfaces of the disk portion so that the fibers 18 come to the radial ends of the metal 19 in the radial direction. In this way, by bonding the composite material to the front and back surfaces of the metal part 19, the metal part 19 and the disk part 6 are firmly bonded.

次に円筒部端部の円盤部との締結構造を図１０を用いて説明する。
図１０は円筒部端部の構造を示した部分断面図である。
図１０において、円盤部と同様に円筒部端部の金属２１表裏面に複合材料２０がくるように配置される。金属部２１にはボルト１７を通すための貫通穴１６が設けられている。この貫通穴１６にボルト１７を通し、円盤部の金属１９とねじ締結することにより図８に示すように円盤部と円筒部を締結することができる。このねじ締結は複数箇所行う。このときに半径方向にボルト１７の長手方向がくるようにすることで、ボルトには軸方向の力がかかるので高い荷重まで耐えることができる。円盤部と円筒部をねじにより締結するときに、円盤部と円筒部の接触部には接着剤を塗っておいてもよい。接着剤を塗ることでボルトにかかる荷重を低減することができる。搭載機器の円筒部への締結方法は回転部を一体で製作したときと同様の方法を用いて固定することができる。 Next, a fastening structure between the cylindrical part and the disk part will be described with reference to FIG.
FIG. 10 is a partial cross-sectional view showing the structure of the end portion of the cylindrical portion.
In FIG. 10, the composite material 20 is arranged so as to be on the front and back surfaces of the metal 21 at the end portion of the cylindrical portion in the same manner as the disk portion. The metal part 21 is provided with a through hole 16 through which the bolt 17 is passed. A bolt 17 is passed through the through hole 16 and screwed to the metal 19 of the disk portion, whereby the disk portion and the cylindrical portion can be fastened as shown in FIG. This screw fastening is performed at a plurality of locations. At this time, by making the longitudinal direction of the bolt 17 in the radial direction, an axial force is applied to the bolt, so that a high load can be withstood. When the disc portion and the cylindrical portion are fastened with screws, an adhesive may be applied to the contact portion between the disc portion and the cylindrical portion. The load applied to the bolt can be reduced by applying the adhesive. The fastening method to the cylindrical part of the mounted device can be fixed by using the same method as when the rotating part is manufactured integrally.

Ｘ線ＣＴ装置の概要を示した斜視図である。It is the perspective view which showed the outline | summary of the X-ray CT apparatus. Ｘ線ＣＴ装置回転部の固定部と回転部の概要を示した斜視図である。It is the perspective view which showed the outline | summary of the fixing | fixed part and rotation part of a X-ray CT apparatus rotation part. 本発明の一実施例を示した回転部の繊維方向を示した斜視図である。It is the perspective view which showed the fiber direction of the rotation part which showed one Example of this invention. 図３のＡ−Ａ線断面図である。FIG. 4 is a sectional view taken along line AA in FIG. 3. 円筒部に搭載機器を固定する穴を示した図である。It is the figure which showed the hole which fixes mounting equipment to a cylindrical part. 円筒部の搭載機器固定用の穴に金属部材を埋め込んだ図である。It is the figure which embedded the metal member in the hole for mounting apparatus fixation of a cylindrical part. 円筒部の内側に搭載機器固定用の金属板を設置した図である。It is the figure which installed the metal plate for mounting equipment fixation inside the cylindrical part. 本発明の他の実施例を示した図である。It is the figure which showed the other Example of this invention. 円盤部の断面構造を示した図である。It is the figure which showed the cross-section of the disc part. 円筒部端部の構造を示した図である。It is the figure which showed the structure of the cylindrical part edge part.

符号の説明Explanation of symbols

１…架台、２…寝台、３…制御部、６…円盤部、７…円筒部。
DESCRIPTION OF SYMBOLS 1 ... Stand, 2 ... Bed, 3 ... Control part, 6 ... Disk part, 7 ... Cylindrical part.

Claims (4)

架台内部に取付けられた回転部と、この回転部を支持する固定部と、前記回転部を制御する制御部とを備え、前記回転部は円筒形状をし、この円筒形状部にはＸ線管や検出器等の搭載機器が固定したＸ線ＣＴ装置において、
前記円筒部の中心部から遠い最外周面に円周方向の繊維を配置されていることを特徴とするＸ線ＣＴ装置。 A rotating part mounted inside the gantry, a fixed part that supports the rotating part, and a control part that controls the rotating part, the rotating part has a cylindrical shape, and the cylindrical part has an X-ray tube In the X-ray CT apparatus fixed by the mounted equipment such as detector and detector,
An X-ray CT apparatus, wherein fibers in the circumferential direction are arranged on the outermost peripheral surface far from the center of the cylindrical portion. 請求項１のＸ線ＣＴ装置において、
前記円筒部と円盤部がなす角度を９０度より大きくしたことを特徴とするＸ線ＣＴ装置。 The X-ray CT apparatus according to claim 1,
An X-ray CT apparatus characterized in that an angle formed by the cylindrical part and the disk part is larger than 90 degrees. 請求項１記載のＸ線ＣＴ装置において、
繊維としては、カーボン、ガラス、アルミナ等を用いたことを特徴とするＸ線ＣＴ装置。 The X-ray CT apparatus according to claim 1,
An X-ray CT apparatus using carbon, glass, alumina or the like as the fiber. 請求項１記載のＸ線ＣＴ装置おいて、
前記回転部を円盤と円筒に分割し、前記円盤と円筒の端部に金属部を有し、この金属部をボルトで締結することを特徴とするＸ線ＣＴ装置。
The X-ray CT apparatus according to claim 1,
An X-ray CT apparatus characterized in that the rotating part is divided into a disk and a cylinder, a metal part is provided at ends of the disk and the cylinder, and the metal part is fastened with a bolt.
JP2005359732A 2005-12-14 2005-12-14 X-ray CT system Expired - Fee Related JP4686352B2 (en)

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JP2013046863A (en) * 2012-12-06 2013-03-07 Mitsubishi Electric Corp Rotary irradiation treatment device
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JP2011147652A (en) * 2010-01-22 2011-08-04 Hitachi Medical Corp X ray ct apparatus
JP2013046863A (en) * 2012-12-06 2013-03-07 Mitsubishi Electric Corp Rotary irradiation treatment device
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