JPH08257023A - X-ray ct device - Google Patents
X-ray ct deviceInfo
- Publication number
- JPH08257023A JPH08257023A JP7092986A JP9298695A JPH08257023A JP H08257023 A JPH08257023 A JP H08257023A JP 7092986 A JP7092986 A JP 7092986A JP 9298695 A JP9298695 A JP 9298695A JP H08257023 A JPH08257023 A JP H08257023A
- Authority
- JP
- Japan
- Prior art keywords
- gantry
- subject
- opening
- opening portion
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003780 insertion Methods 0.000 claims description 44
- 230000037431 insertion Effects 0.000 claims description 44
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000008961 swelling Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 60
- 238000003384 imaging method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 101100008874 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) DAS2 gene Proteins 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ガントリの開口部に
挿入された被検体の周回方向からＸ線を曝射し、被検体
を透過した周回方向からの透過Ｘ線を検出して被検体の
所望の断層面の断層像を得るとともに、開口部に挿入さ
れた被検体の体軸方向にガントリを傾動させ、被検体の
体軸に対して傾斜した撮影面における断層像をも得るこ
とができるＸ線ＣＴ装置に係り、特には、上記ガントリ
の傾動動作において、ガントリの開口部内周面と天板と
の間に被検体が挟まれる事故を防止するための技術、さ
らに詳しくは、この事故防止に用いる接触検知手段の改
良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention irradiates X-rays from an orbiting direction of a subject inserted into an opening of a gantry and detects X-rays transmitted through the subject from the orbiting direction to detect the subject. It is possible to obtain a tomographic image of a desired tomographic plane, and also to obtain a tomographic image on an imaging plane tilted with respect to the body axis of the subject by tilting the gantry in the body axis direction of the subject inserted in the opening. The present invention relates to a possible X-ray CT apparatus, and more particularly to a technique for preventing an accident in which a subject is caught between the inner peripheral surface of the opening of the gantry and the top plate in the tilting motion of the gantry, more specifically, this accident. The present invention relates to improvement of contact detection means used for prevention.
【０００２】[0002]
【従来の技術】この種のＸ線ＣＴ装置は、天板に搭載さ
れた被検体を挿抜する開口部が設けられたガントリを備
えている。ガントリには、例えば、開口部の中心軸周り
に回転される架台が内蔵され、この架台には、Ｘ線管と
Ｘ線検出器とが対向配置されて取り付けられている。被
検体が開口部に挿入された状態で、架台を回転させＸ線
管とＸ線検出器とを対向状態を維持しつつ被検体の周囲
で回転させ、この回転中に、Ｘ線管から被検体に向けて
Ｘ線を曝射し、被検体を透過したＸ線をＸ線検出器で検
出して、被検体の周回方向からの透過Ｘ線を検出し、こ
の検出データに基づき所望の断層面の断層像を得るよう
に構成されている。2. Description of the Related Art An X-ray CT apparatus of this type includes a gantry mounted on a top plate and provided with an opening for inserting and removing a subject. The gantry, for example, has a built-in pedestal that rotates around the central axis of the opening, and the X-ray tube and the X-ray detector are attached to the gantry so as to face each other. With the object being inserted into the opening, the gantry is rotated to rotate the X-ray tube and the X-ray detector around the object while maintaining the facing state, and during this rotation, the X-ray tube is rotated from the object. X-rays are radiated toward the specimen, X-rays transmitted through the specimen are detected by an X-ray detector, and transmitted X-rays from the circling direction of the specimen are detected. It is configured to obtain a tomographic image of the surface.
【０００３】また、近年、被検体の体軸に対して傾斜し
た撮影面における断層像を得るために、開口部に挿入さ
れた被検体の体軸方向にガントリを傾動させる、いわゆ
るチルト機構を備えたＸ線ＣＴ装置も市場に提供されて
いる。In recent years, in order to obtain a tomographic image on an imaging plane inclined with respect to the body axis of the subject, a so-called tilt mechanism for tilting the gantry in the body axis direction of the subject inserted into the opening is provided. X-ray CT systems are also available on the market.
【０００４】このチルト機構を有するＸ線ＣＴ装置によ
る撮影は、ガントリを所定角度に傾動させ、天板を移動
して断層面の位置決めを行い、架台を回転させるととも
にＸ線を曝射させ、透過Ｘ線を検出させることで行われ
る。そして、これら一連の動作を繰り返して所望の断層
面についての撮影を順次行う。In the imaging by the X-ray CT apparatus having this tilt mechanism, the gantry is tilted at a predetermined angle, the top plate is moved to position the tomographic plane, the gantry is rotated, and X-rays are emitted to transmit. It is performed by detecting X-rays. Then, these series of operations are repeated to sequentially perform imaging of desired tomographic planes.
【０００５】ところで、上記撮影時の操作のうち、ガン
トリの傾動と天板の移動（断層面の位置決め）とは、ガ
ントリに設けられた操作盤で行い、架台の回転や、Ｘ線
の曝射、透過Ｘ線の検出は、ガントリが設置された検査
室と別室の操作室に設けられた操作盤から行うように構
成されている。従って、複数枚の断層像を撮影する場合
には、これら一連の操作を行う術者は、検査室と操作室
とを往復しなければならず、術者の負担が大きくなる。Among the above-mentioned operations at the time of photographing, tilting of the gantry and movement of the top plate (positioning of the tomographic plane) are performed by an operation panel provided on the gantry, and rotation of the gantry and exposure of X-rays. The transmitted X-rays are detected from an operation panel provided in an operation room separate from the examination room in which the gantry is installed. Therefore, when capturing a plurality of tomographic images, the operator who performs these series of operations must reciprocate between the examination room and the operation room, which increases the burden on the operator.
【０００６】この術者の負担を軽減するために、全ての
操作を操作室の操作盤で行うように構成した場合、断層
面の位置決めの操作に際、傾動されるガントリの開口部
の内周面と、被検体を搭載する天板との間に被検体が挟
まれる事故が起きることが懸念される。In order to reduce the burden on the operator, if all the operations are performed by the operation panel of the operation room, the inner circumference of the opening of the gantry that is tilted when the operation of positioning the tomographic plane is performed. There is a concern that an object may be caught between the surface and the top plate on which the object is mounted.
【０００７】そこで、従来、撮影に関する全ての操作を
操作室の操作盤で行うとともに、上記事故を防止するよ
うに構成されたＸ線ＣＴ装置が、特開平4-183444号公報
に提案されている。Therefore, conventionally, an X-ray CT apparatus has been proposed in Japanese Patent Application Laid-Open No. 4-183444, in which all the operations relating to imaging are performed on the operation panel in the operation room and the above accident is prevented. .
【０００８】この従来装置は、ガントリの開口部のう
ち、被検体が挿入される傾斜面の上半分の形状に合わせ
た形状を有する面状検出手段（面状の検出部材を内蔵し
ている）を、被検体が挿入される傾斜面の上半分に装着
するとともに、被検体が挿入される傾斜面と反対側の傾
斜面の上半分の形状に合わせた形状を有する同様の面状
検出手段を、この傾斜面の上半分に装着するように構成
している。そして、断層面の位置決め操作の際、傾動さ
れるガントリの開口部のいずれかの傾斜面に被検体が接
触するのを検知すると、ガントリの傾動や天板の移動な
どを停止したり、あるいは、被検体に接触された傾斜面
が被検体から離れる方向にガントリを傾動させるなどの
制御を行い、上記事故を防止している。This conventional apparatus has a planar detecting means (having a planar detecting member built-in) having a shape matching the shape of the upper half of the inclined surface of the gantry opening into which the subject is inserted. Is attached to the upper half of the inclined surface into which the subject is inserted, and a similar planar detecting means having a shape matching the shape of the upper half of the inclined surface opposite to the inclined surface into which the subject is inserted is provided. , Is configured to be attached to the upper half of this inclined surface. Then, during the positioning operation of the tomographic plane, when it is detected that the subject touches any of the inclined surfaces of the opening of the tilted gantry, the tilting of the gantry or the movement of the top plate is stopped, or The above-mentioned accident is prevented by performing control such as tilting the gantry in a direction in which the inclined surface in contact with the subject separates from the subject.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、このよ
うな構成を有する従来例の場合には、次のような問題が
ある。すなわち、従来装置に係る公報第３図に示される
ように、従来装置に備えられた面状検出手段は、ガント
リの開口部の傾斜部の上半分の形状に合わせた形状に一
体物として構成されている。しかしながら、ガントリの
開口部の形状は、例えば、機種ごとに異なる形状を有す
るなど、その形状は種々存在する。従って、従来装置に
備えられた面状検出手段のような構成では、ガントリの
開口部の形状が異なる機種ごとに、それぞれの形状に合
わせて面状検出手段を製作しなければならず、型代など
を含めコスト高を招くし、大量生産の妨げとなり、さら
に、製造管理や在庫管理などその取扱いが煩雑であると
いう種々の問題がある。However, the prior art having such a structure has the following problems. That is, as shown in FIG. 3 of the publication relating to the conventional device, the planar detection means provided in the conventional device is integrally formed into a shape matching the shape of the upper half of the inclined portion of the opening of the gantry. ing. However, there are various shapes of the opening of the gantry, such as different shapes depending on the model. Therefore, in the structure such as the surface detecting means provided in the conventional device, the surface detecting means must be manufactured in accordance with each model of the gantry having different shapes of the opening portions, and the mold cost However, there are various problems that the cost is increased including the above, the mass production is hindered, and the handling such as manufacturing control and inventory control is complicated.
【００１０】また、従来例に係る公報の同第３図に示さ
れるように、面状検出手段からの検出信号の導出は一対
であり、例えば、従来装置の面状検出手段に内蔵される
面状検出部材を複数個に分割して構成している場合であ
っても、各面状検出部材は電気的に直列に接続されてい
るので、例えば、いずれかの面状検出部材が故障したと
しても、面状検出手段としては機能しなくなり、面状検
出手段そのものを交換しなければならないという問題も
ある。Further, as shown in FIG. 3 of the publication related to the conventional example, there is a pair of derivation of the detection signal from the planar detecting means, and for example, the surface incorporated in the planar detecting means of the conventional apparatus. Even when the shape detection member is divided into a plurality of parts, since each area detection member is electrically connected in series, for example, if one of the area detection members fails. However, there is also a problem that the planar state detecting means does not function and the planar state detecting means itself must be replaced.
【００１１】この発明は、このような事情に鑑みてなさ
れたものであって、上記不都合を解消した面状の接触検
知手段を備えたＸ線ＣＴ装置を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an X-ray CT apparatus provided with a planar contact detecting means which eliminates the above-mentioned inconvenience.
【００１２】[0012]
【課題を解決するための手段】この発明は、このような
目的を達成するために、次のような構成をとる。すなわ
ち、この発明は、天板に搭載された被検体を挿抜する開
口部が設けられ、前記開口部の中心軸周りから前記開口
部に挿入された被検体にＸ線を曝射するとともに前記被
検体を透過した周回方向からの透過Ｘ線を検出するＸ線
撮影機器が内蔵されたガントリを備え、かつ、前記開口
部に挿入された被検体の体軸方向に前記ガントリを傾動
させる傾動機構を備えたＸ線ＣＴ装置において、前記ガ
ントリの開口部のうち、少なくとも被検体が挿入される
開口部分付近（以下、挿入開口部分という）と、それと
反対側の開口部分付近（以下、対向開口部分という）
が、内側に膨らんだ３次元曲面を有し、かつ、傾斜部分
が内側に窪んだ曲線である台形形状または扇状形状を有
する面状の接触検知手段を複数枚、それぞれ曲線部分を
隣接させて前記挿入開口部分の上方領域と前記対向開口
部分の上方領域とに装着させ、前記いずれかの接触検知
手段からの検知状態に基づき、前記ガントリの傾動また
は／および天板の移動を制御する制御手段を備えたもの
である。The present invention has the following configuration to achieve the above object. That is, the present invention is provided with an opening for inserting and removing the subject mounted on the top plate, irradiates the subject inserted in the opening with X-rays from around the central axis of the opening, and A tilting mechanism is provided that includes a gantry in which an X-ray imaging device that detects transmitted X-rays from the orbiting direction that has passed through the sample is incorporated, and that tilts the gantry in the body axis direction of the subject inserted into the opening. In an X-ray CT apparatus provided with the gantry, at least the vicinity of an opening portion into which a subject is inserted (hereinafter referred to as an insertion opening portion) and the opening portion on the opposite side thereof (hereinafter referred to as a counter opening portion). )
Is a trapezoidal or fan-shaped contact detection means having a three-dimensional curved surface that bulges inward and the inclined portion is a curved curve inward, and the curved contact portions are adjacent to each other. A control unit that is mounted on the upper region of the insertion opening portion and the upper region of the facing opening portion, and controls tilting of the gantry and / or movement of the top plate based on a detection state from any one of the contact detecting units. Be prepared.
【００１３】[0013]
【作用】この発明の作用は次のとおりである。この発明
は、ガントリの開口部のうち、少なくとも被検体が挿入
される挿入開口部分と、それと反対側の対向開口部分
が、内側に膨らんだ３次元曲面を有した、市場に多く提
供されているＸ線ＣＴ装置を対象としている。The operation of the present invention is as follows. INDUSTRIAL APPLICABILITY The present invention is widely provided on the market in which at least the insertion opening portion into which the subject is inserted and the opposite opening portion on the opposite side of the opening portion of the gantry have a three-dimensional curved surface bulging inward. Intended for X-ray CT systems.
【００１４】この発明に用いられる面状の接触検知手段
は、台形または扇状で、その傾斜部分が内側に窪んだ曲
線を有する形状である。この接触検知手段のガントリ開
口部の挿入開口部分の上方領域への装着は、複数枚の接
触検知手段をそれぞれ内側に窪んだ曲線部分を隣接させ
て行われる。このとき、前記挿入開口部分は、内側に膨
らんだ３次元曲面を有しているので、各接触検知手段の
つなぎ目は擬似的に直線となり、各接触検知手段のつな
ぎ目の隙間が無くなる。また、前記接触検知手段のガン
トリ開口部の対向開口部分の上方領域への装着も、前記
挿入開口部分への装着と同様に複数枚の接触検知手段の
曲線部分を隣接させて行われる。The planar contact detecting means used in the present invention has a trapezoidal shape or a fan shape, and the inclined portion thereof has a curved shape with an inward recess. The attachment of the contact detection means to the upper region of the insertion opening portion of the gantry opening portion is performed by adjoining a plurality of contact detection means with curved portions that are recessed inward. At this time, since the insertion opening portion has a three-dimensional curved surface that bulges inward, the joint between the contact detection means becomes a pseudo straight line, and the gap between the contact detection means is eliminated. Further, the mounting of the contact detecting means in the upper region of the facing opening of the gantry opening is also performed by adjoining the curved portions of the plurality of contact detecting means in the same manner as the mounting in the insertion opening.
【００１５】そして、断層面の位置決めの際、傾動させ
るガントリの開口部内周面（挿入開口部分の上方領域と
対向開口部分の上方領域）と天板上の被検体とが接触す
れば、上記のようにこれら領域に装着されているいずれ
かの接触検知手段がその接触を検知する。制御手段は、
上記いずれかの接触検知手段からの検知状態に基づき、
ガントリの傾動または／および天板の移動を制御し、こ
の傾動させるガントリの開口部内周面と天板との間に被
検体が挟まれる事故を防止する。When the tomographic plane is positioned, if the inner peripheral surface of the opening of the gantry to be tilted (the area above the insertion opening and the area above the opposing opening) comes into contact with the subject on the top plate, As described above, any of the contact detecting means mounted in these areas detects the contact. The control means
Based on the detection state from any of the above contact detection means,
By controlling the tilting of the gantry and / or the movement of the top plate, it is possible to prevent an accident in which a subject is caught between the inner peripheral surface of the tilted gantry opening and the top plate.
【００１６】[0016]
【実施例】以下、図面を参照してこの発明の一実施例を
説明する。図１は、この発明の実施例に係るＸ線ＣＴ装
置の構成を示す図であり、図２は、実施例装置に備えら
れたガントリを被検体挿入側から見た外観斜視図であ
る。なお、図１ではガントリを断面図で描いている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an X-ray CT apparatus according to an embodiment of the present invention, and FIG. 2 is an external perspective view of a gantry provided in the apparatus of the embodiment as seen from the subject insertion side. Note that, in FIG. 1, the gantry is depicted in a sectional view.
【００１７】この実施例装置は、大まかには検査室ＴＲ
に備えられたベッド１やガントリ２と、操作室ＯＲに備
えられた制御部３、操作盤４、画像処理部５、出力装置
６などで構成されている。The apparatus of this embodiment is roughly the inspection room TR.
The bed 1 and the gantry 2 provided in the operation room, the control unit 3, the operation panel 4, the image processing unit 5, and the output device 6 provided in the operation room OR.
【００１８】ベッド１は、検査室ＴＲの床面に設置され
た昇降自在のベッド基台１０と、このベッド基台１０の
上部に水平移動自在に支持された天板１１などで構成さ
れている。被検体Ｍはこの天板１１の上に載置される。
また、ベッド基台１０の昇降や天板１０の水平移動は、
後述する制御部３に制御されて行われる。The bed 1 is composed of a vertically movable bed base 10 installed on the floor of the examination room TR and a top plate 11 which is supported on the bed base 10 so as to be horizontally movable. . The subject M is placed on the top plate 11.
In addition, raising and lowering the bed base 10 and horizontally moving the top 10
It is performed under the control of the control unit 3 described later.
【００１９】ガントリ２は、ベッド１に近接されて設置
されたガントリ基台１２の上部に取り付けられている。
ガントリ２の底部にはソリ状の部材１３が設けられ、こ
の部材１３がガントリ基台１２の凹部１４に、コロ１５
などを介して摺動自在に嵌め付けられている。また、ガ
ントリ基台１２に内設されたモータ１６によって回転さ
れるスプロケット１７ａに架けられたチェーン１８は、
他のスプロケット１７ｂ、１７ｃにも架けられ、その両
端部が、上記ソリ状部材１３の両端に連結されている。
モータ１６を回動することで、ソリ状部材１３がガント
リ基台１２の凹部１４内を摺動し、その結果、ガントリ
２は図の左右方向に傾動される。この傾動、すなわち、
モータ１６の駆動制御も制御部３によって行われる。The gantry 2 is attached to the upper part of a gantry base 12 installed close to the bed 1.
A warp-shaped member 13 is provided at the bottom of the gantry 2, and the member 13 is provided in the concave portion 14 of the gantry base 12 with a roller 15
It is slidably fitted through such as. In addition, the chain 18 mounted on the sprocket 17a rotated by the motor 16 provided in the gantry base 12 is
The sprockets 17b and 17c are also suspended, and both ends thereof are connected to both ends of the sled member 13.
By rotating the motor 16, the sled member 13 slides in the recess 14 of the gantry base 12, and as a result, the gantry 2 is tilted in the left-right direction in the drawing. This tilt, that is,
The drive control of the motor 16 is also performed by the control unit 3.
【００２０】ガントリ２には、上記天板１１の水平移動
によって、天板１１上の被検体Ｍを挿抜するための開口
部２０が設けられている。この開口部２０は、被検体Ｍ
を挿入する側の外側に向かって開口が広がっている開口
部分（挿入開口部分）２０ａと、それと反対側において
外側に向かって開口が広がっている開口部分（対向開口
部分）２０ｂと、その間の円筒部分２０ｃとで構成され
ている。挿入開口部分２０ａや対向開口部分２０ｂは、
内側に膨らんだ３次元曲面を有して構成されている。ま
た、図では、対向開口部分２０ｂの曲面の外側方向への
曲率は、挿入開口部分２０ａのそれに比べて緩やかに構
成されている。なお、ガントリの種類によっては、円筒
部分２０ｃが設けられていないもののある。The gantry 2 is provided with an opening 20 for inserting and removing the subject M on the top plate 11 by the horizontal movement of the top plate 11. The opening 20 is used for the subject M.
An opening portion (insertion opening portion) 20a having an opening widening toward the outside on the side where the insert is inserted, an opening portion (opposing opening portion) 20b having an opening widening toward the outside on the opposite side, and a cylinder therebetween. It is composed of a portion 20c. The insertion opening portion 20a and the facing opening portion 20b are
It has a three-dimensional curved surface that bulges inward. Further, in the drawing, the curvature of the curved surface of the facing opening portion 20b toward the outer side is configured to be gentler than that of the insertion opening portion 20a. The cylindrical portion 20c may not be provided depending on the type of gantry.
【００２１】上記挿入開口部分２０ａの上方領域と、対
向開口部分２０ｂの上方領域とには、この発明の要部で
ある面状の接触検知部材２１が両面粘着テープなどで貼
り付け装着されている。この接触検知部材２１の詳述は
後述するが、この接触検知部材２１は外部から押圧され
るとその状態（接触状態）を検知し、この検知状態を制
御部３が検知できるように構成されている。A planar contact detection member 21, which is an essential part of the present invention, is attached and attached to the upper region of the insertion opening portion 20a and the upper region of the opposing opening portion 20b by a double-sided adhesive tape or the like. . Although the contact detection member 21 will be described in detail later, the contact detection member 21 is configured to detect its state (contact state) when pressed from the outside, and the control unit 3 can detect this detection state. There is.
【００２２】ガントリ２には、モータ２２の回転がベル
ト２２ａによって伝動されることで開口部２０の中心軸
Ｊ周りに回転されるドーナツ状の架台２３が内蔵されて
いる。この架台２３には、Ｘ線を曝射するＸ線管２４
と、Ｘ線管２４から曝射され、開口部２０内に挿入され
た被検体Ｍを透過したＸ線を検出するＸ線検出器２５と
が対向配置されて取り付けられている。そしてモータ２
２を駆動して架台２３を中心軸Ｊ周りで回転させること
で、Ｘ線管２４とＸ線検出器２５とが対向状態を維持し
つつ、中心軸Ｊ周りで回転され、この回転中に、Ｘ線管
２４からＸ線が曝射され、開口部２０内に挿入された被
検体Ｍを透過したＸ線をＸ線検出器２５が検出し、被検
体Ｍの周回方向からの透過Ｘ線を収集する。なお、Ｘ線
検出器２５には、データ収集エレクトロニクス（ＤＡ
Ｓ）２６が付設され、上記被検体Ｍの周回方向からの透
過Ｘ線データの収集はこのＤＡＳ２６が行う。収集され
たデータは画像処理部５に送られる。また、Ｘ線管２４
からのＸ線曝射は、高電圧発生装置２７から高電圧がＸ
線管２４に供給されて行われる。この高電圧発生装置２
７からの高電圧の供給は、Ｘ線制御部２８によって行わ
れる。なお、架台２３（Ｘ線管２４とＸ線検出器２５）
の回転、すなわち、モータ２２の駆動制御や、ＤＡＳ２
６によるデータ収集の開始の制御、Ｘ線制御部２８の制
御（Ｘ線曝射のタイミングの制御など）は、制御部３に
よって行われる。The gantry 2 contains a donut-shaped mount 23 which is rotated around the central axis J of the opening 20 by the rotation of the motor 22 being transmitted by the belt 22a. The pedestal 23 has an X-ray tube 24 for irradiating X-rays.
And an X-ray detector 25 that detects X-rays that have been exposed from the X-ray tube 24 and that have been transmitted through the subject M that has been inserted into the opening 20 are disposed so as to face each other. And motor 2
By driving 2 to rotate the gantry 23 around the central axis J, the X-ray tube 24 and the X-ray detector 25 are rotated around the central axis J while maintaining the facing state, and during this rotation, An X-ray is emitted from the X-ray tube 24, the X-ray detector 25 detects the X-ray transmitted through the subject M inserted into the opening 20, and the transmitted X-ray from the circumferential direction of the subject M is detected. collect. The X-ray detector 25 includes data acquisition electronics (DA
S) 26 is attached, and the DAS 26 collects the transmission X-ray data from the circling direction of the subject M. The collected data is sent to the image processing unit 5. In addition, the X-ray tube 24
X-ray irradiation from the high voltage generator 27
It is performed by being supplied to the wire tube 24. This high voltage generator 2
The high voltage is supplied from the X-ray controller 7. The pedestal 23 (X-ray tube 24 and X-ray detector 25)
Rotation, that is, drive control of the motor 22 and DAS2
The control of the start of data collection by 6 and the control of the X-ray controller 28 (such as the control of the timing of X-ray exposure) are performed by the controller 3.
【００２３】制御部３は、後述する操作盤４からの指示
に従って、ベッド基台１０の昇降を制御し、また、ガン
トリ２の傾動や天板１１の水平移動を制御して断層面の
位置決めなどを行い、さらに、架台２３の回転、ＤＡＳ
２６によるデータ収集の開始、Ｘ線制御部２８を制御し
て位置決めされた断層面の断層像の撮影を行う。この制
御部３は、例えば、ＣＰＵやメモリなどからなるマイク
ロコンピュータで構成される。The control unit 3 controls the raising and lowering of the bed base 10 according to an instruction from the operation panel 4 which will be described later, and also controls the tilting of the gantry 2 and the horizontal movement of the top 11 to position the tomographic plane. Then, rotate the pedestal 23, DAS
The data collection by 26 is started, and the X-ray controller 28 is controlled to capture a tomographic image of the positioned tomographic plane. The control unit 3 is composed of, for example, a microcomputer including a CPU and a memory.
【００２４】操作盤４は、ベッド基台１０の昇降の指
示、ガントリ２の傾動方向や角度の設定と傾動の開始の
指示、天板１１の水平移動方向やその移動量の設定と水
平移動の開始の指示、架台２３の回転の開始と停止の指
示、ＤＡＳ２６によるデータ収集の開始の指示、Ｘ線管
２４からのＸ線曝射の開始と停止の指示などを行うため
のものである。The operation panel 4 is used to instruct the bed base 10 to move up and down, to set the tilting direction and angle of the gantry 2 and to start tilting, to set the horizontal movement direction of the top 11 and its movement amount, and to set the horizontal movement. It is for issuing a start instruction, an instruction to start and stop rotation of the gantry 23, an instruction to start data acquisition by the DAS 26, an instruction to start and stop X-ray irradiation from the X-ray tube 24, and the like.
【００２５】画像処理部５は、ＤＡＳ２６から送られた
被検体Ｍの位置決めされた断層面の周回方向からのＸ線
透過データに基づき、周知の方法でその断層面の断層像
を再構成して出力装置６に出力する。The image processing section 5 reconstructs a tomographic image of the tomographic plane by a known method based on the X-ray transmission data from the orbiting direction of the tomographic plane of the subject M sent from the DAS 26. Output to the output device 6.
【００２６】出力装置６は、得られた断層像を表示する
ためのモニタや、フィルムなどに焼き付けて出力するた
めのレーザープリンタなどで構成されている。The output device 6 is composed of a monitor for displaying the obtained tomographic image, a laser printer for printing on a film or the like for output.
【００２７】上記構成の実施例装置による断層像の撮影
は、次のような手順で行われる。まず、ベッド基台１０
が降下され天板１１が下方に下げられた状態で術者は被
検体Ｍを天板１１上に載置する。そして、術者は検査室
ＴＲから操作室ＯＲに移動し、操作盤４からまずベッド
基台１０の上昇を指示し、天板１１を上昇させ、被検体
Ｍの体軸をガントリ２の開口部２０の中心軸Ｊに合わせ
るように被検体Ｍの高さを調節する。The tomographic image is photographed by the apparatus having the above-mentioned structure according to the following procedure. First, the bed base 10
The operator places the subject M on the top plate 11 in a state in which the subject M is lowered and the top plate 11 is lowered downward. Then, the operator moves from the examination room TR to the operation room OR, and first instructs the raising of the bed base 10 from the operation panel 4, raises the top 11, and the body axis of the subject M to the opening of the gantry 2. The height of the subject M is adjusted so as to match the central axis J of 20.
【００２８】次に、天板１１を図１の左方向に水平移動
させ、被検体Ｍをガントリ１の開口部２０に挿入させ、
被検体Ｍの所望の断層面をＸ線管２４とＸ線検出器２５
とを結ぶ撮影位置（撮影面）に位置合わせする。この位
置合わせは、例えば、ガントリ１の開口部２０の挿入開
口部分２０ａ側部に設けられたスリット２９（図２参
照）から照射されるの照射光を指標として行われる。す
なわち、上記被検体Ｍの開口部２０への挿入の際、スリ
ット２９から光を被検体Ｍに向けて照射させる。そし
て、この照射光が、被検体Ｍの所望の断層面を照射する
と、術者は操作盤４から指示を与える。スリット２９か
ら上記撮影面までの距離は既知であるので、上記術者か
らの指示より、制御部３はスリット２９から上記撮影面
までの距離だけ天板１１を図１の左方向に水平移動させ
ることにより、被検体Ｍの所望の断層面が撮影面に位置
合わせされる。Next, the top plate 11 is horizontally moved to the left in FIG. 1, and the subject M is inserted into the opening 20 of the gantry 1,
An X-ray tube 24 and an X-ray detector 25 are provided on a desired slice plane of the subject M.
Align with the shooting position (shooting surface) that connects to and. This alignment is performed using, for example, the irradiation light emitted from the slit 29 (see FIG. 2) provided on the side of the insertion opening 20a of the opening 20 of the gantry 1 as an index. That is, when the subject M is inserted into the opening 20, the slit 29 irradiates the subject M with light. Then, when this irradiation light irradiates a desired tomographic plane of the subject M, the operator gives an instruction from the operation panel 4. Since the distance from the slit 29 to the photographing surface is known, the control unit 3 horizontally moves the top plate 11 leftward in FIG. 1 by the distance from the slit 29 to the photographing surface according to an instruction from the operator. As a result, the desired tomographic plane of the subject M is aligned with the imaging plane.
【００２９】そして、架台２３を回転させ、Ｘ線管２４
からＸ線を曝射させるとともにＤＡＳ２６にデータを収
集させて、この断層面の周回方向からのＸ線透過データ
を収集し、収集されたデータに基づきその断層面の断層
像を得て、出力装置２６を構成するモニタに表示させ
る。そして、モニタに表示された断層像を参照するなど
して、次の断層面を決め、次の断層面を撮影面に位置さ
せるように、天板１１を所定移動量だけ水平移動させ、
その断層面の周回方向からのＸ線透過データを収集して
断層像を得る。この操作を繰り返して必要な断層像の撮
影を行い、撮影が終了すると、天板１１を図１の右方向
に水平移動させ、被検体Ｍをガントリ２の開口部２０か
ら退出させ、ベッド基台１０を降下させて天板１１を下
方に位置させ、被検体Ｍを天板１１から降ろす。Then, the gantry 23 is rotated to move the X-ray tube 24.
X-ray is emitted from the device and the DAS 26 collects data, X-ray transmission data from the orbital direction of the tomographic plane is collected, and a tomographic image of the tomographic plane is obtained based on the collected data, and the output device 26 is displayed on the monitor. Then, by referring to the tomographic image displayed on the monitor, the next tomographic plane is determined, and the top plate 11 is horizontally moved by a predetermined movement amount so that the next tomographic plane is positioned on the imaging plane.
X-ray transmission data from the circumferential direction of the tomographic plane is collected to obtain a tomographic image. This operation is repeated to capture a required tomographic image, and when the imaging is completed, the top plate 11 is horizontally moved to the right in FIG. 1, the subject M is withdrawn from the opening 20 of the gantry 2, and the bed base is moved. 10 is lowered to position the top 11 downward, and the subject M is lowered from the top 11.
【００３０】なお、上記断層像の撮影中に、被検体Ｍの
体軸に対して傾斜した撮影面における断層像を得る場合
には、適宜ガントリ２を傾動させる。Incidentally, when obtaining a tomographic image on the imaging plane tilted with respect to the body axis of the subject M during the imaging of the tomographic image, the gantry 2 is tilted appropriately.
【００３１】上記一連の撮影手順は、術者が操作室ＯＲ
に居て、操作盤４から種々の指示を与えながら行われ
る。このとき、ガントリ２を傾動させ過ぎると、ガント
リ２の開口部２０の挿入開口部分２０ａの上方領域（ガ
ントリ２を図１の右側に傾動させた場合）、または、対
向開口部分２０ｂの上方領域（ガントリ２を図１の左側
に傾動させた場合）と、天板１１との間に、被検体Ｍが
挟まれる事故が起きる。また、ガントリ２が傾動された
状態で、天板１１を水平移動したとき、例えば、被検体
Ｍの体厚が厚い胸部部分などが、上記挿入開口部分２０
ａの上方領域や対向開口部分２０ｂの上方領域にぶつか
り、その結果、上記同様に被検体Ｍが、上記挿入開口部
分２０ａの上方領域や対向開口部分２０ｂの上方領域と
天板１１との間に挟まれることになる。The above-mentioned series of photographing procedures is performed by the operator in the operation room OR.
The operation is performed while giving various instructions from the operation panel 4. At this time, if the gantry 2 is tilted too much, the upper area of the insertion opening 20a of the opening 20 of the gantry 2 (when the gantry 2 is tilted to the right in FIG. 1) or the upper area of the opposing opening 20b ( An accident occurs in which the subject M is sandwiched between the top plate 11 and the case where the gantry 2 is tilted to the left in FIG. 1). Further, when the top plate 11 is horizontally moved while the gantry 2 is tilted, for example, the chest portion where the body thickness of the subject M is thick is the insertion opening portion 20.
a, the upper region of the counter opening 20b and the upper region of the counter opening 20b, and as a result, the subject M is, like the above, between the upper region of the insertion opening 20a and the upper region of the counter opening 20b and the top plate 11. You will be pinched.
【００３２】この実施例では、上述したように、挿入開
口部分２０ａの上方領域と対向開口部分２０ｂの上方領
域とに接触検知部材２１を装着しているので、この接触
検知部材２１が被検体Ｍとの接触を検知すると、制御部
３は、現在の部材の制御状況に応じてガントリ２の傾動
や天板１１の移動を停止する。例えば、ガントリ２を傾
動しているときに上記接触を検知するとガントリ２の傾
動を停止し、また、天板１１の移動中に上記接触を検知
すると天板１１の移動を停止する。このように動作する
と、術者は操作室ＴＲから検査室ＯＲに行き、ガントリ
２に設けられた操作盤３０（図２参照）を操作して、被
検体Ｍに接触された開口部２０の内周面が被検体Ｍから
離れる方向にガントリ２を傾動させたり、ベッド基台１
０に設けられたスイッチ３１（図１参照）を操作して、
被検体Ｍに接触された開口部２０の内周面が被検体Ｍか
ら離れる方向に天板１１を移動させて、被検体Ｍとその
接触部分との接触を解除させる。なお、操作盤３０は、
操作盤４からの操作と独立してガントリ２の傾動などの
操作を検査室ＴＲにおいて行うためのもので、スイッチ
３１は、操作盤４からの操作と独立して天板１１の移動
を検査室ＴＲにおいて操作するためのものである。な
お、上記制御部３によるガントリ２の傾動や天板１１の
移動の停止の後、制御部３が、ガントリ２を逆方向に傾
動させたり、天板１１を逆方向に移動させて被検体Ｍと
上記挿入開口部分２０ａの上方領域や対向開口部分２０
ｂの上方領域との接触を自動的に解除するようにしても
よい。In this embodiment, as described above, since the contact detection member 21 is mounted in the upper region of the insertion opening portion 20a and the upper region of the opposed opening portion 20b, the contact detection member 21 is the subject M. Upon detecting the contact with the control unit 3, the control unit 3 stops the tilting of the gantry 2 and the movement of the top 11 according to the current control status of the members. For example, when the contact is detected while the gantry 2 is tilted, the tilting of the gantry 2 is stopped, and when the contact is detected while the top 11 is moving, the movement of the top 11 is stopped. With this operation, the operator goes from the operation room TR to the examination room OR and operates the operation panel 30 (see FIG. 2) provided on the gantry 2 to move the inside of the opening 20 in contact with the subject M. The gantry 2 is tilted in the direction in which the peripheral surface moves away from the subject M, or the bed base 1
0 switch 31 (see FIG. 1) provided,
The top plate 11 is moved in a direction in which the inner peripheral surface of the opening 20 in contact with the subject M moves away from the subject M, and the contact between the subject M and its contact portion is released. The operation panel 30 is
The switch 31 is used to perform an operation such as tilting of the gantry 2 in the examination room TR independently of an operation from the operation panel 4, and the switch 31 moves the top 11 independently of the operation from the operation panel 4. It is for operating in TR. After the tilting of the gantry 2 and the movement of the top plate 11 by the control unit 3 are stopped, the control unit 3 tilts the gantry 2 in the opposite direction or moves the top plate 11 in the opposite direction to cause the subject M to move. And the area above the insertion opening 20a and the opposite opening 20
The contact with the upper region of b may be automatically released.
【００３３】次に、この実施例装置の接触検知部材２１
の詳細構成を説明する。この実施例装置に用いられる接
触検知部材２１は、図３（ａ）、（ｂ）の平面図に示す
ように、傾斜部分４０が内側に窪んだ曲線である台形形
状、または、図３（ｃ）、（ｄ）の平面図に示すよう
に、傾斜部分４０が内側に窪んだ曲線である扇状形状を
有し、２本のリード線４１ａ、４１ｂ（図３（ａ）、
（ｃ）の場合）、または、４本のリード線４１ｃ〜４１
ｆ（図３（ｂ）、（ｄ）の場合）が導出されている。Next, the contact detection member 21 of the apparatus of this embodiment
Will be described in detail. As shown in the plan views of FIGS. 3 (a) and 3 (b), the contact detection member 21 used in the apparatus of this embodiment has a trapezoidal shape in which the inclined portion 40 is a curved line that is recessed inward, or FIG. ) And (d), the inclined portion 40 has a fan-like shape that is a curved line that is recessed inward, and has two lead wires 41a and 41b (FIG. 3A,
(In the case of (c)), or four lead wires 41c to 41
f (in the case of FIGS. 3B and 3D) is derived.
【００３４】この接触検知部材２１は、図４に示すよう
に、面状の電極部材４２ａ、４２ｂが間隙部材（絶縁
体）４３を介して間隙を設けて対向支持され、一方の電
極部材（図では４２ａ）にシリコンなどの絶縁物４４が
点在されている。そして、電極部材４２ａ、４２ｂが保
護布４５に外囲されている。そして、保護布４５に物体
（被検体Ｍ）が接触し、電極部材４２ａまたは４２ｂに
外部から力が働くと、絶縁部材４４を変形させて一対の
電極部材４２ａ、４２ｂが接触し、これをスイッチとし
て電気的に検知する。As shown in FIG. 4, the contact detecting member 21 includes two electrode members 42a and 42b, which are flat and opposed to each other, with a gap member (insulator) 43 interposed therebetween so as to face each other. In 42a), insulators 44 such as silicon are scattered. The electrode members 42a and 42b are surrounded by the protective cloth 45. When an object (subject M) comes into contact with the protective cloth 45 and a force acts on the electrode member 42a or 42b from the outside, the insulating member 44 is deformed and the pair of electrode members 42a and 42b come into contact with each other. As electrically detected.
【００３５】リード線が２本導出されている場合の接触
検知部材２１の電気回路を図５（ａ）に、リード線が４
本導出されている場合の接触検知部材２１の電気回路を
図５（ｂ）に示す。FIG. 5A shows an electric circuit of the contact detecting member 21 in the case where two lead wires are drawn out.
FIG. 5B shows an electric circuit of the contact detection member 21 in the case where the lead-out is performed.
【００３６】図５（ａ）の場合、電極部材４２ａ、４２
ｂで構成されるスイッチ４６がＯＦＦのとき（電極部材
４２ａ、４２ｂが接触されていないとき）、リード線４
１ａ、４１ｂ間は導通されておらず、一方、スイッチ４
６がＯＮのとき（電極部材４２ａ、４２ｂが接触された
とき）、リード線４１ａ、４１ｂ間は導通される。In the case of FIG. 5A, the electrode members 42a, 42a
When the switch 46 composed of b is OFF (when the electrode members 42a and 42b are not in contact with each other), the lead wire 4
There is no conduction between 1a and 41b, while the switch 4
When 6 is ON (when the electrode members 42a and 42b are in contact with each other), the lead wires 41a and 41b are electrically connected.
【００３７】また、図５（ｂ）の場合、電極部材４２
ａ、４２ｂで構成されるスイッチ４６がＯＦＦのとき
（電極部材４２ａ、４２ｂが接触されていないとき）、
リード線４１ｃ、４１ｄ間は導通されており、一方、ス
イッチ４６がＯＮのとき（電極部材４２ａ、４２ｂが接
触されたとき）、リード線４１ｃ、４１ｄ間は導通され
なくなる。In the case of FIG. 5B, the electrode member 42
When the switch 46 composed of a and 42b is OFF (when the electrode members 42a and 42b are not in contact),
The lead wires 41c and 41d are electrically connected, while the switch 46 is ON (when the electrode members 42a and 42b are brought into contact with each other), the lead wires 41c and 41d are not electrically connected.
【００３８】この実施例では、図２に示すように、挿入
開口部分２０ａの上方領域と対向開口部分２０ｂの上方
領域とにそれぞれ、上記接触検知部材２１を複数枚ず
つ、各接触検知部材２１の傾斜部分４０を隣接させて装
着している。なお、図２では、挿入開口部分２０ａの上
方領域に接触検知部材２１が装着された状態のみが見え
てるが、対向開口部分２０ｂの上方領域にもこれを同様
に接触検知部材２１が装着されている（図１参照）。In this embodiment, as shown in FIG. 2, a plurality of the contact detecting members 21 are provided in the upper area of the insertion opening 20a and the upper area of the opposing opening 20b, respectively. The inclined portions 40 are mounted adjacent to each other. Note that, in FIG. 2, only the state where the contact detection member 21 is attached to the upper region of the insertion opening portion 20a is visible, but the contact detection member 21 is also attached to the upper region of the opposed opening portion 20b. (See Figure 1).
【００３９】上述したように、挿入開口部分２０ａは内
側に膨らんだ３次元曲面を有しているので、各接触検知
部材２１のつなぎ目は擬似的に直線となり、各接触検知
部材２１のつなぎ目の隙間が無くなる。また、対向開口
部分ｂも内側に膨らんだ３次元曲面を有しているので、
挿入開口部分２０ａの場合と同様に各接触検知部材２１
のつなぎ目の隙間が無くなる。As described above, since the insertion opening portion 20a has a three-dimensional curved surface that bulges inward, the joint between the contact detecting members 21 becomes a pseudo straight line, and the gap between the joints between the contact detecting members 21 is formed. Disappears. Further, since the opposed opening portion b also has a three-dimensional curved surface bulging inward,
As in the case of the insertion opening portion 20a, each contact detection member 21
The gap between the joints disappears.
【００４０】例えば、図３の点線で補足した台形形状ま
たは扇型形状の接触検知部材２１を内側に膨らんだ３次
元曲面を有する挿入開口部分２０ａの上方領域や、対向
開口部分２０ｂの上方領域に装着した場合、各接触検知
部材２１のつなぎ目に、図６（ａ）の斜線領域で示すよ
うな隙間が形成される。このような隙間は、外側方向に
曲率が大きい挿入開口部分２０ａの場合、図６（ｂ）に
示すように、ベッド１側の各接触検知部材２１のつなぎ
目の隙間が広くなり、ガントリ２がベッド１側に傾動さ
れたときの挿入開口部分２０ａの上方領域と被検体Ｍと
の接触に際して、いわゆるデッドスペースとなる領域
（接触検知市内領域）が広くなり、挿入開口部分２０ａ
の上方領域と被検体Ｍとの接触洩れが発生するなどの問
題がある。これに対して、この実施例のように接触検知
部材２１が傾斜部分４０を内側に窪んだ曲線である台形
形状または扇状形状で構成することで上記隙間が無くな
る。For example, in the upper region of the insertion opening portion 20a having a three-dimensional curved surface in which the trapezoidal or fan-shaped contact detection member 21 supplemented by the dotted line in FIG. 3 is formed, and in the upper region of the opposing opening portion 20b. When mounted, a gap as shown by the hatched area in FIG. 6A is formed at the joint between the contact detection members 21. In the case of the insertion opening portion 20a having a large curvature in the outward direction, such a gap widens the joint between the contact detection members 21 on the bed 1 side, and the gantry 2 becomes a bed, as shown in FIG. 6B. When contacting the upper region of the insertion opening portion 20a and the subject M when tilted to the 1st side, a so-called dead space area (contact detection city area) becomes wider, and the insertion opening portion 20a becomes wider.
There is a problem that contact leakage between the upper region of the object and the subject M occurs. On the other hand, as in this embodiment, the contact detection member 21 has the trapezoidal shape or the fan-shaped shape, which is the curved line in which the inclined portion 40 is recessed inward, so that the above gap is eliminated.
【００４１】また、例えば、同一形状の接触検知部材２
１を挿入開口部分２０ａの上方領域と対向開口部分２０
ｂの上方領域とに装着した場合、接触検知部材２１の曲
線部分４０の曲率が同じであるのに対して、挿入開口部
分２０ａの曲面の曲率と対向開口部分２０ｂの曲面の曲
率とが相違するが、Ｘ線ＣＴ装置の構成上、この差異は
極端に大きくないので、この差異は誤差の範囲で吸収さ
れ、従って、いずれの領域においても装着された接触検
知部材２１のつなぎ目の隙間は無くなるか、隙間が形成
されても僅かであるので、挿入開口部分２０ａの上方領
域や対向開口領域２０ｂの上方領域と被検体Ｍとの接触
を洩れなく検知することができる。従って、開口部２０
の形状が異なる種々のガントリ２に対しても同一形状の
接触検知部材２１で対応することができる。Further, for example, the contact detection member 2 having the same shape
1 is a region above the insertion opening portion 20a and the opposite opening portion 20a.
When attached to the upper region of b, the curvature of the curved portion 40 of the contact detection member 21 is the same, but the curvature of the curved surface of the insertion opening portion 20a and the curvature of the curved surface of the opposed opening portion 20b are different. However, since the difference is not extremely large in the configuration of the X-ray CT apparatus, this difference is absorbed within the error range, and therefore, the gap between the joints of the contact detection members 21 attached is eliminated in any region. Since the gap is small even if it is formed, it is possible to detect the contact between the subject M and the upper region of the insertion opening portion 20a or the upper region of the counter opening region 20b without leakage. Therefore, the opening 20
The contact detection member 21 having the same shape can be applied to various gantry 2 having different shapes.
【００４２】上記挿入開口部分２０ａの上方領域と対向
開口領域２０ｂの上方領域とにそれぞれ装着された複数
枚の接触検知部材２１からの検知状態（リード線４１
ａ、４１ｂまたは４１ｃ、４１ｄ）は、それぞれ制御部
３に接続されている。この接続状態を図７に示す。制御
部３では、これら複数の接触検知部材２１のいずれかが
検知することによって挿入開口部分２０ａの上方領域や
対向開口領域２０ｂの上方領域と被検体Ｍとが接触した
場合の上述した制御（ガントリ２の傾動の停止や点板１
１の移動の停止など）を行う。A detection state (lead wire 41) from a plurality of contact detection members 21 mounted in the upper region of the insertion opening portion 20a and the upper region of the opposed opening region 20b, respectively.
a, 41b or 41c, 41d) are respectively connected to the control unit 3. This connection state is shown in FIG. The control unit 3 performs the above-described control in the case where the upper region of the insertion opening portion 20a or the upper region of the opposing opening region 20b comes into contact with the subject M by detection by any one of the plurality of contact detection members 21 (gantry). Stop tilting of 2 and point plate 1
1 stop movement, etc.).
【００４３】このように接触検知部材２１を複数に分割
して挿入開口部分２０ａの上方領域や対向開口領域２０
ｂの上方領域に装着し、いずれかの接触検知部材２１の
接触検知により制御部３が所定の制御を行うように構成
しているので、仮に、どれか１個の接触検知部材２１が
故障したとしても、その故障した接触検知部材２１のみ
を取り替えればよく、従来装置のように、挿入開口部分
２０ａの上方領域や対向開口領域２０ｂの上方領域に装
着された一体物の面状検出手段自体を取り替えるような
無駄を防止できる。As described above, the contact detecting member 21 is divided into a plurality of parts, and the area above the insertion opening portion 20a and the opposing opening area 20 are divided.
Since it is configured to be mounted in the upper region of b and the control unit 3 performs a predetermined control by the contact detection of any one of the contact detection members 21, any one of the contact detection members 21 is temporarily broken. However, only the defective contact detection member 21 needs to be replaced, and as in the conventional device, the planar state detecting means itself of the integrated body mounted in the upper region of the insertion opening portion 20a or the upper region of the opposing opening region 20b. It is possible to prevent waste such as replacing.
【００４４】なお、リード線が４本導出されている接触
検知部材２１の場合、接触を検知していない場合、リー
ド線４１ｃ、４１ｄ間は導通されているが、接触検知部
材２１が故障すると接触を検知していないにもかかわら
ずリード線４１ｃ、４１ｄ間は導通されることになる。
従って、これら接触検知部材２１と制御部３との接続を
図７（ｃ）に示すように構成すれば、制御部３は個々の
接触検知部材２１の故障を認識することができる。例え
ば、撮影前で被検体Ｍが開口部２０に挿入されておら
ず、挿入開口部分２０ａの上方領域や対向開口領域２０
ｂの上方領域と被検体Ｍとが接触することがない状態に
おいて、リード線４１ｃ、４１ｄ間が導通されているこ
とを制御部３が検知すれば、その接触検知部材２１が故
障であると判断できる。制御部３は、この故障している
接触検知部材２１を術者に知らせる（個々の接触検知部
材２１の故障状態に対応するランプを点灯する等）こと
により、術者は撮影前に故障した接触検知部材２１を取
替えておくことができ、実用上便利にある。In the case of the contact detecting member 21 in which four lead wires are led out, if no contact is detected, the lead wires 41c and 41d are electrically connected, but contact is made when the contact detecting member 21 fails. Although the lead wire is not detected, the lead wires 41c and 41d are electrically connected.
Therefore, if the connection between the contact detection member 21 and the control unit 3 is configured as shown in FIG. 7C, the control unit 3 can recognize the failure of each contact detection member 21. For example, the subject M is not inserted into the opening 20 before imaging, and the region above the insertion opening 20a or the opposite opening 20
If the control unit 3 detects that the lead wires 41c and 41d are electrically connected to each other in a state where the upper region of b and the subject M are not in contact with each other, it is determined that the contact detection member 21 is defective. it can. The control unit 3 notifies the operator of the contact detection member 21 having the failure (such as turning on a lamp corresponding to the failure state of each contact detection member 21), so that the operator receives the contact failure before the imaging. The detection member 21 can be replaced, which is convenient in practice.
【００４５】[0045]
【発明の効果】以上の説明から明らかなように、この発
明によれば、被検体が挿入される挿入開口部分とそれと
反対側の対向開口部分が、内側に膨らんだ３次元曲面を
有する開口部が設けられたガントリを対象とし、傾斜部
分が内側に窪んだ曲線である台形形状または扇状形状を
有する面状の接触検知手段を複数枚、それぞれ曲線部分
を隣接させて前記挿入開口部分の上方領域と前記対向開
口部分の上方領域とに装着したので、前記挿入開口部分
の上方領域と前記対向開口部分の上方領域とには、各接
触検知手段のつなぎ目の隙間を無くして接触検知手段を
装着することができる。しかも、このような構成で接触
検知手段を前記挿入開口部分の上方領域と前記対向開口
部分の上方領域とに装着したので、前記挿入開口部分や
前記対向開口部分の３次元曲面の形状が異なった場合
に、同一形状の接触検知手段を用いても、各接触検知手
段のつなぎ目の隙間は誤差の範囲で吸収される。従っ
て、種々の形状の開口部を有するガントリに対しても、
同一形状の接触検知手段で対応することができ、コスト
の低減、管理の簡易化を図れ、接触検知手段の大量生産
にも好適に対応することができる。As is apparent from the above description, according to the present invention, the insertion opening portion into which the subject is inserted and the opposite opening portion opposite to the insertion opening portion have an inwardly bulging three-dimensional curved surface. Targeting a gantry provided with a plurality of planar contact detection means having a trapezoidal shape or a fan shape in which an inclined portion is a concave curve, and an area above the insertion opening portion with the curved portions adjacent to each other. And the upper area of the counter opening portion, the contact detecting means is mounted in the upper area of the insertion opening portion and the upper area of the counter opening portion without a gap between the contact detecting means. be able to. Moreover, since the contact detection means is mounted in the upper region of the insertion opening portion and the upper region of the opposed opening portion with such a configuration, the shapes of the three-dimensional curved surfaces of the insertion opening portion and the opposed opening portion are different. In this case, even if the contact detecting means having the same shape are used, the gap between the joints of the contact detecting means is absorbed within an error range. Therefore, even for gantry with openings of various shapes,
The contact detection means having the same shape can be used, the cost can be reduced, the management can be simplified, and the mass production of the contact detection means can be appropriately applied.
【００４６】また、前記挿入開口部分の上方領域と前記
対向開口部分の上方領域とに装着した接触検知手段は複
数枚に分割されているので、接触検知手段の部分的な交
換にも容易に対応することができる。Further, since the contact detecting means mounted in the upper region of the insertion opening portion and the upper region of the opposing opening portion are divided into a plurality of sheets, it is easy to partially replace the contact detecting means. can do.
【図１】この発明の実施例に係るＸ線ＣＴ装置の構成を
示す図である。FIG. 1 is a diagram showing a configuration of an X-ray CT apparatus according to an embodiment of the present invention.
【図２】実施例装置に備えられたガントリを被検体挿入
側から見た外観斜視図である。FIG. 2 is an external perspective view of a gantry provided in the apparatus of the embodiment as seen from the subject insertion side.
【図３】実施例装置に用いる接触検知部材の構成を示す
平面図である。FIG. 3 is a plan view showing a configuration of a contact detection member used in the apparatus of the embodiment.
【図４】接触検知部材の内部構成を示す断面図である。FIG. 4 is a cross-sectional view showing an internal configuration of a contact detection member.
【図５】接触検知部材による接触を検知するための電気
回路図である。FIG. 5 is an electric circuit diagram for detecting contact by a contact detection member.
【図６】接触検知部材の傾斜部分を曲線で構成しない場
合の問題を説明するための図である。FIG. 6 is a diagram for explaining a problem when the inclined portion of the contact detection member is not formed by a curved line.
【図７】各接触検知部材と制御部との接続を示す図であ
る。FIG. 7 is a diagram showing a connection between each contact detection member and a control unit.
【符号の説明】 ２ … ガントリ ３ … 制御部 １１ … 天板 １６ … ガントリ傾動用のモータ ２０ … 開口部 ２０ａ … 挿入開口部分 ２０ｂ … 対向開口部分 ２１ … 接触検知部材 ２２ … Ｘ線管やＸ線検出器を回転させるモータ ２４ … Ｘ線管 ２５ … Ｘ線検出器 ４０ … 接触検知部材の曲線で構成される傾斜部分 Ｊ … ガントリ開口部の中心軸 Ｍ … 被検体[Explanation of reference symbols] 2 ... Gantry 3 ... Control unit 11 ... Top plate 16 ... Motor for tilting gantry 20 ... Opening 20a ... Inserting opening 20b ... Opposing opening 21 ... Contact detection member 22 ... X-ray tube or X-ray Motor for rotating the detector 24 ... X-ray tube 25 ... X-ray detector 40 ... Inclined portion formed by the curve of the contact detection member J ... Central axis of gantry opening M ... Subject
Claims (1)
部が設けられ、前記開口部の中心軸周りから前記開口部
に挿入された被検体にＸ線を曝射するとともに前記被検
体を透過した周回方向からの透過Ｘ線を検出するＸ線撮
影機器が内蔵されたガントリを備え、かつ、前記開口部
に挿入された被検体の体軸方向に前記ガントリを傾動さ
せる傾動機構を備えたＸ線ＣＴ装置において、前記ガン
トリの開口部のうち、少なくとも被検体が挿入される開
口部分付近（以下、挿入開口部分という）と、それと反
対側の開口部分付近（以下、対向開口部分という）が、
内側に膨らんだ３次元曲面を有し、かつ、傾斜部分が内
側に窪んだ曲線である台形形状または扇状形状を有する
面状の接触検知手段を複数枚、それぞれ曲線部分を隣接
させて前記挿入開口部分の上方領域と前記対向開口部分
の上方領域とに装着させ、前記いずれかの接触検知手段
からの検知状態に基づき、前記ガントリの傾動または／
および天板の移動を制御する制御手段を備えたことを特
徴とするＸ線ＣＴ装置。1. An opening for inserting and removing a subject mounted on a top plate is provided, and the subject inserted into the opening is irradiated with X-rays from around the central axis of the opening and the subject is also exposed. And a tilting mechanism for tilting the gantry in the body axis direction of the subject inserted into the opening. In the X-ray CT apparatus, in the opening of the gantry, at least in the vicinity of the opening portion into which the subject is inserted (hereinafter referred to as insertion opening portion) and in the vicinity of the opposite opening portion (hereinafter referred to as counter opening portion). But,
A plurality of planar contact detecting means having a three-dimensional curved surface bulging inward and having a trapezoidal shape or a fan-like shape in which an inclined portion is a curved curve recessed inward, with the curved portions being adjacent to each other, the insertion opening The gantry is attached to the upper region of the portion and the upper region of the opposed opening portion, and the gantry is tilted or
And an X-ray CT apparatus comprising a control means for controlling the movement of the top plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092986A JP3047370B2 (en) | 1995-03-27 | 1995-03-27 | X-ray CT system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092986A JP3047370B2 (en) | 1995-03-27 | 1995-03-27 | X-ray CT system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08257023A true JPH08257023A (en) | 1996-10-08 |
| JP3047370B2 JP3047370B2 (en) | 2000-05-29 |
Family
ID=14069704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7092986A Expired - Fee Related JP3047370B2 (en) | 1995-03-27 | 1995-03-27 | X-ray CT system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3047370B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000116644A (en) * | 1998-10-16 | 2000-04-25 | Toshiba Corp | X-ray ct instrument |
| WO2000057785A1 (en) * | 1999-03-26 | 2000-10-05 | Hitachi Medical Corporation | Medical x-ray apparatus |
| US7486767B2 (en) | 2004-08-27 | 2009-02-03 | J. Morita Manufacturing Corporation | X-ray apparatus |
| US9937363B2 (en) | 2015-05-14 | 2018-04-10 | Hitachi, Ltd. | Particle beam irradiation system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6490974B2 (en) | 2015-01-30 | 2019-03-27 | キヤノンメディカルシステムズ株式会社 | Medical image diagnostic apparatus, medical image diagnostic method, and medical image diagnostic program |
-
1995
- 1995-03-27 JP JP7092986A patent/JP3047370B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000116644A (en) * | 1998-10-16 | 2000-04-25 | Toshiba Corp | X-ray ct instrument |
| WO2000057785A1 (en) * | 1999-03-26 | 2000-10-05 | Hitachi Medical Corporation | Medical x-ray apparatus |
| US7486767B2 (en) | 2004-08-27 | 2009-02-03 | J. Morita Manufacturing Corporation | X-ray apparatus |
| US9937363B2 (en) | 2015-05-14 | 2018-04-10 | Hitachi, Ltd. | Particle beam irradiation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3047370B2 (en) | 2000-05-29 |
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