JP2014128412A

JP2014128412A - Fluoroscopic apparatus

Info

Publication number: JP2014128412A
Application number: JP2012287868A
Authority: JP
Inventors: Takeshi Shinokawa; 毅篠川; Seiji Yamanaka; 誓次山中; Yui Torigoe; 唯鳥越; Masayuki Yamaji; 昌行山地; Koichi Yamawaki; 浩一山脇
Original assignee: Shimadzu Corp
Current assignee: Shimadzu Corp
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2014-07-10
Anticipated expiration: 2032-12-28
Also published as: JP6107134B2

Abstract

PROBLEM TO BE SOLVED: To provide a fluoroscopic apparatus capable of performing accurate fluoroscopy by accurately positioning an X-ray tube or an X-ray detector.SOLUTION: A third rail 13 for an X-ray detector is arranged between first and second rails 11 and 12 for the X-ray detector. A first wheel 31, which rotates in the state of abutting on the first rail 11, and a second wheel, which rotates in the state of abutting on the second rail 12, and a third wheel, which rotates in the state of abutting on the third rail 13, are arranged on a first base 4a for the X-ray detector. A distance between the first and second wheels 31 and 32 is set changeable.

Description

この発明は、Ｘ線管とＸ線検出器とを備え、被検者を透視するＸ線透視装置に関する。 The present invention relates to an X-ray fluoroscopy device that includes an X-ray tube and an X-ray detector and that allows a subject to be seen through.

癌などの患部に対してＸ線や電子線等の放射線を照射する放射線治療においては、放射線を患部に正確に照射する必要がある。しかしながら、被検者が体を動かしてしまう場合があるばかりではなく、患部自体に動きが生ずる場合がある。例えば、肺の近くの腫瘍は呼吸に基づき大きく移動する。このため、腫瘍のそばにマーカを配置し、このマーカの位置を２方向Ｘ線透視式の動体追跡装置で検出して、治療放射線の照射を制御する構成を有する放射線治療装置が提案されている（特許文献１および特許文献２参照）。 In radiation therapy in which radiation such as X-rays or electron beams is applied to an affected area such as cancer, it is necessary to accurately irradiate the affected area with radiation. However, not only the subject may move the body, but the affected part itself may move. For example, a tumor near the lung moves greatly based on respiration. For this reason, a radiotherapy apparatus having a configuration in which a marker is arranged near the tumor, the position of the marker is detected by a two-way fluoroscopic moving object tracking apparatus, and irradiation of therapeutic radiation is controlled has been proposed. (See Patent Document 1 and Patent Document 2).

この放射線治療装置においては、第１Ｘ線管と第１Ｘ線検出器から成る第１Ｘ線透視機構と、第２Ｘ線管と第２Ｘ線検出器から成る第２Ｘ線透視機構とを使用して体内に埋め込まれたマーカを撮影し、第１Ｘ線透視機構による二次元の透視画像と第２Ｘ線透視機構による二次元の透視画像を利用して三次元の位置情報を得る。そして、連続してＸ線透視を行うことによって、リアルタイムでマーカの三次元の位置情報を演算することで、移動を伴う部位のマーカを高精度で検出することができ、このマーカの位置情報に基づいて治療放射線の照射を制御することで、腫瘍の動きに応じた高精度の放射線照射を実行することが可能となる。 In this radiotherapy apparatus, a first X-ray fluoroscopic mechanism composed of a first X-ray tube and a first X-ray detector and a second X-ray fluoroscopic mechanism composed of a second X-ray tube and a second X-ray detector are used in the body. The embedded marker is photographed, and three-dimensional position information is obtained using a two-dimensional fluoroscopic image by the first X-ray fluoroscopic mechanism and a two-dimensional fluoroscopic image by the second X-ray fluoroscopic mechanism. And by performing X-ray fluoroscopy continuously, it is possible to detect the marker of the part with movement with high accuracy by calculating the three-dimensional position information of the marker in real time. By controlling the irradiation of the therapeutic radiation based on this, it becomes possible to execute the radiation irradiation with high accuracy according to the movement of the tumor.

特許第３０５３３８９号公報Japanese Patent No. 3053389 特開２００６−２３０６７３号公報JP 2006-230673 A

このような放射線治療装置に使用されるＸ線透視装置は、互いに平行に配置された略Ｕ字形状を有する一対のレールを天井から吊下し、この一対のレールに沿って第１Ｘ線検出器を支持した台座と第２Ｘ線検出器を支持した台座とを移動させるとともに、互いに平行に配置された略Ｕ字形状を有する一対のレールを床下に埋設し、この一対のレールに沿って第１Ｘ線管を支持した台座と第２Ｘ線管を支持した台座とを移動させることにより、第１、第２Ｘ線管と第１、第２Ｘ線検出器とを必要な位置に移動させる構成となっている。 An X-ray fluoroscopic apparatus used in such a radiotherapy apparatus suspends a pair of rails having a substantially U shape arranged in parallel with each other from a ceiling, and a first X-ray detector along the pair of rails. A pair of rails having a substantially U-shape arranged in parallel to each other are buried under the floor, and the first X along the pair of rails is moved. By moving the pedestal supporting the tube and the pedestal supporting the second X-ray tube, the first and second X-ray tubes and the first and second X-ray detectors are moved to necessary positions. Yes.

図８は、このような従来のＸ線透視装置において、Ｘ線管またはＸ線検出器を支持した台座９３を互いに平行に配設された一対のレール９１、９２に沿って移動させる構成を示す概要図である。また、図９は、台座９３に位置ずれが生ずる状態を示す説明図である。なお、これらの図においては、一対のレール９１、９２については、一部の領域のみを図示している。 FIG. 8 shows a configuration in which a pedestal 93 supporting an X-ray tube or an X-ray detector is moved along a pair of rails 91 and 92 arranged in parallel to each other in such a conventional X-ray fluoroscopic apparatus. FIG. FIG. 9 is an explanatory diagram showing a state in which the position shift occurs in the pedestal 93. In these drawings, only a part of the pair of rails 91 and 92 is illustrated.

一対のレール９１、９２は、直線部と円弧部とを備えている。そして、台座９３には、レール９１と当接して回転する車輪９４と、レール９２と当接して回転する一対の車輪９５とが配設されている。ここで、直線部と円弧部とから構成される一対のレール９１、９２においては、直線部における一対のレール９１、９２間の距離Ａと、円弧部における一対のレール９１、９２間の距離Ｂとを正確に一致させることは困難である。このため、一対の車輪９５は、車輪９４との距離を変更可能な状態で台座９３に配設されている。そして、台座９３には、一対の車輪９５をレール９２に向けて付勢するバネ９６が配設されている。これにより、台座９３を一対のレール９１、９２における直線部と円弧部との両方に沿って、スムースに移動させることが可能となる。 The pair of rails 91 and 92 includes a linear portion and an arc portion. The pedestal 93 is provided with a wheel 94 that rotates in contact with the rail 91 and a pair of wheels 95 that rotate in contact with the rail 92. Here, in the pair of rails 91 and 92 composed of the straight line portion and the arc portion, the distance A between the pair of rails 91 and 92 in the straight portion and the distance B between the pair of rails 91 and 92 in the arc portion. It is difficult to match the two accurately. For this reason, a pair of wheel 95 is arrange | positioned in the base 93 in the state which can change the distance with the wheel 94. FIG. The pedestal 93 is provided with a spring 96 that urges the pair of wheels 95 toward the rail 92. Accordingly, the pedestal 93 can be smoothly moved along both the linear portion and the arc portion of the pair of rails 91 and 92.

しかしながら、このような構成を採用した場合には、台座９３に位置ずれが生ずる場合がある。すなわち、この台座９３は、一対のバネ９６の作用によりその位置を変更することが可能な状態であることから、一対のレール９１、９２における直線部において、図９（ａ）に示す状態から傾斜して、図９（ｂ）に示す状態となる場合がある。このような現象が生じた場合には、台座９３により支持されたＸ線管またはＸ線検出器に位置ずれが生じ、正確なＸ線透視が実行できないことになる。 However, when such a configuration is adopted, the pedestal 93 may be displaced. That is, since this pedestal 93 is in a state in which its position can be changed by the action of the pair of springs 96, the straight portions in the pair of rails 91 and 92 are inclined from the state shown in FIG. In some cases, the state shown in FIG. When such a phenomenon occurs, the X-ray tube or the X-ray detector supported by the pedestal 93 is displaced and accurate X-ray fluoroscopy cannot be performed.

図１０は、他の従来の実施形態に係る台座９３において位置ずれが生ずる状態を示す説明図である。 FIG. 10 is an explanatory view showing a state in which a position shift occurs in a pedestal 93 according to another conventional embodiment.

この実施形態においても、台座９３には、レール９１と当接して回転する車輪９４と、レール９２と当接して回転する一対の車輪９５とが配設されている。そして、この実施形態においては、一対の車輪９５は台座９３に固定されており、車輪９４が車輪９５との距離を変更可能な状態で台座９３に配設されている。そして、台座９３には、車輪９４をレール９１に向けて付勢するバネ９７が配設されている。この実施形態においても、台座９３が一対のレール９１、９２における直線部において、図１０（ａ）に示す状態から傾斜して、図１０（ｂ）に示す状態となる場合がある。この場合においても、台座９３により支持されたＸ線管またはＸ線検出器に位置ずれが生じ、正確なＸ線透視が実行できないことになる。 Also in this embodiment, the pedestal 93 is provided with a wheel 94 that rotates in contact with the rail 91 and a pair of wheels 95 that rotate in contact with the rail 92. In this embodiment, the pair of wheels 95 are fixed to the pedestal 93, and the wheels 94 are arranged on the pedestal 93 so that the distance from the wheels 95 can be changed. The pedestal 93 is provided with a spring 97 that biases the wheel 94 toward the rail 91. Also in this embodiment, the pedestal 93 may incline from the state shown in FIG. 10A at the linear portion of the pair of rails 91 and 92 to be in the state shown in FIG. Even in this case, the X-ray tube or the X-ray detector supported by the pedestal 93 is displaced and accurate X-ray fluoroscopy cannot be performed.

この発明は上記課題を解決するためになされたものであり、Ｘ線管またはＸ線検出器を正確に位置決めして、正確なＸ線透視を実行することが可能なＸ線透視装置を提供することを目的とする。 The present invention has been made to solve the above-described problems, and provides an X-ray fluoroscopy device capable of accurately positioning an X-ray tube or an X-ray detector and performing accurate X-ray fluoroscopy. For the purpose.

請求項１に記載の発明は、Ｘ線を照射するＸ線管と、当該Ｘ線を画像信号に変換するＸ線検出器と、前記Ｘ線管または前記Ｘ線検出器を支持する台座と、直線部と円弧部とを備え、互いに平行に配設されることにより前記台座を案内する第１、第２レールと、前記台座に配設され、前記第１レールと当接して回転する第１車輪と、前記台座に配設され、前記第２レールと当接して回転する第２車輪と、前記第２車輪を前記第２レールに向けて付勢する付勢手段と、前記第１レールおよび前記第２レールにおける直線部と対向する位置において、前記第１レールおよび前記第２レールと平行に配設された直線状の第３レールと、前記台座に配設され、前記第３レールに当接して回転する第３車輪とを備えることを特徴とする。 The invention according to claim 1 is an X-ray tube that emits X-rays, an X-ray detector that converts the X-rays into image signals, a pedestal that supports the X-ray tube or the X-ray detector, First and second rails, each of which includes a straight portion and an arc portion and guides the pedestal by being arranged in parallel to each other, and a first that is arranged on the pedestal and rotates in contact with the first rail. A wheel, a second wheel disposed on the pedestal and rotating in contact with the second rail, a biasing means for biasing the second wheel toward the second rail, the first rail, The first rail and the third linear rail disposed in parallel to the second rail and the pedestal at a position facing the straight line portion of the second rail and the third rail. And a third wheel that rotates in contact therewith.

請求項２に記載の発明は、請求項１に記載の発明において、前記第３レールは、前記Ｘ線管または前記Ｘ線検出器における予め設定された透視位置付近に配設される。 According to a second aspect of the present invention, in the first aspect of the present invention, the third rail is disposed in the vicinity of a preset fluoroscopic position in the X-ray tube or the X-ray detector.

請求項３に記載の発明は、請求項２に記載の発明において、前記第３レールは、前記第１レールと前記第２レールとの間の位置に配設される。 According to a third aspect of the present invention, in the second aspect of the present invention, the third rail is disposed at a position between the first rail and the second rail.

請求項４に記載の発明は、Ｘ線を照射する第１Ｘ線管と当該Ｘ線を画像信号に変換する第１Ｘ線検出器とから成る第１Ｘ線透視機構と、Ｘ線を照射する第２Ｘ線管と当該Ｘ線を画像信号に変換する第２Ｘ線検出器とから成る第２Ｘ線透視機構と、前記第１Ｘ線管と前記第１Ｘ線検出器とを、互いに対向配置される予め設定された第１透視位置および第２透視位置に移動させるとともに、前記第２Ｘ線管と前記第２Ｘ線検出器とを、互いに対向配置される予め設定された第１透視位置および第２透視位置に移動させる移動機構と、を備えたＸ線透視装置において、前記移動機構は、前記第１Ｘ線管を支持するＸ線管用第１台座と、前記第２Ｘ線管を支持するＸ線管用第２台座と、前記第１Ｘ線管および前記第２Ｘ線管における第１透視位置に配置された直線部と、前記第１Ｘ線管および前記第２Ｘ線管における第２透視位置に配置された直線部と、これらの直線部を連結するための円弧部を有する連結部とを各々備え、互いに平行に配設されることにより前記Ｘ線管用第１台座および前記Ｘ線管用第２台座を案内するＸ線管用の第１、第２レールと、前記Ｘ線管用第１台座および前記Ｘ線管用第２台座に各々配設され、前記Ｘ線管用の第１レールと当接して回転する第１車輪と、前記Ｘ線管用第１台座および前記Ｘ線管用第２台座に各々配設され、前記Ｘ線管用の第２レールと当接して回転する第２車輪と、前記第２車輪を前記Ｘ線管用の第２レールに向けて付勢する付勢手段と、前記Ｘ線管用の第１レールおよび前記Ｘ線管用の第２レールにおける直線部と対向する位置において、前記Ｘ線管用の第１レールおよび前記Ｘ線管用の第２レールと平行に配設された直線状のＸ線管用の第３レールと、前記Ｘ線管用第１台座および前記Ｘ線管用第２台座に各々配設され、前記Ｘ線管用の第３レールに当接して回転する第３車輪と、前記第１Ｘ線検出器を支持するＸ線検出器用第１台座と、前記第２Ｘ線検出器を支持するＸ線検出器用第２台座と、前記第１Ｘ線検出器および前記第２Ｘ線検出器における第１透視位置に配置された直線部と、前記第１Ｘ線検出器および前記第２Ｘ線検出器における第２透視位置に配置された直線部と、これらの直線部を連結するための円弧部を有する連結部とを各々備え、互いに平行に配設されることにより前記Ｘ線検出器用第１台座および前記Ｘ線検出器用第２台座を案内するＸ線検出器用の第１、第２レールと、Ｘ線検出器用第１台座および前記Ｘ線検出器用第２台座に各々配設され、前記Ｘ線検出器用の第１レールと当接して回転する第１車輪と、Ｘ線検出器用第１台座および前記Ｘ線検出器用第２台座に各々配設され、前記Ｘ線検出器用の第２レールと当接して回転する第２車輪と、前記第２車輪を前記Ｘ線検出器用の第２レールに向けて付勢する付勢手段と、前記Ｘ線検出器用の第１レールおよび前記Ｘ線検出器用の第２レールにおける直線部と対向する位置において、前記Ｘ線検出器用の第１レールおよび前記Ｘ線検出器用の第２レールと平行に配設された直線状のＸ線検出器用の第３レールと、前記Ｘ線検出器用第１台座および前記Ｘ線検出器用第２台座に各々配設され、前記Ｘ線検出器用の第３レールに当接して回転する第３車輪とを備えることを特徴とする。 According to a fourth aspect of the present invention, there is provided a first X-ray fluoroscopic mechanism comprising a first X-ray tube that emits X-rays and a first X-ray detector that converts the X-rays into image signals, and a second X that emits X-rays. A second X-ray fluoroscopic mechanism including a X-ray tube and a second X-ray detector that converts the X-ray into an image signal, and the first X-ray tube and the first X-ray detector are set in advance so as to face each other. The first X-ray position and the second X-ray position are moved to the first X-ray position and the second X-ray position, which are set to face each other. An X-ray fluoroscopic apparatus comprising: a moving mechanism for moving the first X-ray tube supporting the first X-ray tube; and a second X-ray tube supporting base supporting the second X-ray tube; The first X-ray tube and the second X-ray tube are arranged at the first fluoroscopic position. Each having a straight line portion, a straight line portion disposed at a second see-through position in the first X-ray tube and the second X-ray tube, and a connecting portion having an arc portion for connecting these straight line portions, First and second rails for the X-ray tube that guide the X-ray tube first pedestal and the second X-ray tube pedestal by being arranged in parallel with each other, the first X-ray tube pedestal, and the X-ray Respectively disposed on the second pedestal for the tube, and disposed on the first wheel for rotating in contact with the first rail for the X-ray tube, the first pedestal for the X-ray tube, and the second pedestal for the X-ray tube, A second wheel rotating in contact with the second rail for the X-ray tube; biasing means for biasing the second wheel toward the second rail for the X-ray tube; and a first wheel for the X-ray tube. In a position facing the straight portion of the rail and the second rail for the X-ray tube, The first rail for the X-ray tube and the third rail for the straight X-ray tube arranged in parallel with the second rail for the X-ray tube, the first pedestal for the X-ray tube and the second rail for the X-ray tube A third wheel disposed on the pedestal and rotating in contact with the third rail for the X-ray tube; a first pedestal for X-ray detector supporting the first X-ray detector; and the second X-ray detector. A second pedestal for X-ray detector that supports the first X-ray detector, a linear portion arranged at a first fluoroscopic position in the first X-ray detector and the second X-ray detector, the first X-ray detector and the second X-ray detection The X-ray detector first is provided with a straight line portion arranged at a second see-through position in the instrument and a connecting portion having an arc portion for connecting these straight line portions, and arranged in parallel to each other. A first X-ray detector for guiding the pedestal and the second X-ray detector pedestal; A first wheel that is disposed on each of the first rail for the X-ray detector and the second base for the X-ray detector and rotates in contact with the first rail for the X-ray detector; A second wheel disposed on the first pedestal for the line detector and the second pedestal for the X-ray detector and rotating in contact with the second rail for the X-ray detector; and the X-ray detection of the second wheel. An urging means for urging toward the second rail for the instrument, and the X-ray detector for the X-ray detector at a position facing the linear portion of the first rail for the X-ray detector and the second rail for the X-ray detector. A third rail for a linear X-ray detector disposed in parallel with the first rail and the second rail for the X-ray detector; the first pedestal for the X-ray detector; and the second pedestal for the X-ray detector. Each of which is disposed in contact with the third rail for the X-ray detector and rotates. Characterized in that it comprises a third wheel.

請求項１および請求項４に記載の発明によれば、Ｘ線管またはＸ線検出器を支持する台座を、直線部と円弧部を備えて互いに平行に配置された一対のレールによって案内する構成を採用した場合においても、台座を正確に位置決めすることが可能となる。このため、Ｘ線管またはＸ線検出器を正確に位置決めして、正確なＸ線透視を実行することが可能となる。 According to invention of Claim 1 and Claim 4, the structure which guides the base which supports an X-ray tube or an X-ray detector by a pair of rail provided with the linear part and the circular arc part, and mutually arrange | positioned in parallel. Even when is adopted, the pedestal can be accurately positioned. For this reason, it is possible to accurately position the X-ray tube or the X-ray detector and perform accurate X-ray fluoroscopy.

請求項２に記載の発明によれば、第３レールを必要最小限の位置に配置した場合においても、Ｘ線透視時においてはＸ線管またはＸ線検出器を正確に位置決めして、正確なＸ線透視を実行することが可能となる。 According to the second aspect of the present invention, even when the third rail is arranged at the minimum necessary position, the X-ray tube or the X-ray detector is accurately positioned at the time of X-ray fluoroscopy, X-ray fluoroscopy can be performed.

請求項３に記載の発明によれば、第１レールと第２レールとの間に配置した第３レールにより、コンパクトな構成でありながら、Ｘ線透視時においてＸ線管またはＸ線検出器を正確に位置決めして、正確なＸ線透視を実行することが可能となる。 According to the third aspect of the present invention, the X-ray tube or the X-ray detector can be provided at the time of X-ray fluoroscopy while having a compact configuration by the third rail disposed between the first rail and the second rail. It is possible to accurately position and perform accurate X-ray fluoroscopy.

この発明に係るＸ線透視装置を適用した放射線治療装置の斜視図である。1 is a perspective view of a radiotherapy apparatus to which an X-ray fluoroscopic apparatus according to the present invention is applied. 放射線治療装置におけるヘッド５５およびヘッド支持部５４の揺動動作を示す説明図である。It is explanatory drawing which shows rocking | fluctuation operation | movement of the head 55 and the head support part 54 in a radiotherapy apparatus. 第１Ｘ線管１ａ、第２Ｘ線管１ｂ、第１Ｘ線検出器２ａ、第２Ｘ線検出器２ｂが、各々、第１透視位置および第２透視位置に配置された状態を示す説明図である。It is explanatory drawing which shows the state by which the 1st X-ray tube 1a, the 2nd X-ray tube 1b, the 1st X-ray detector 2a, and the 2nd X-ray detector 2b are each arrange | positioned in the 1st see-through position and the 2nd see-through position. Ｘ線検出器用第１台座４ａとＸ線検出器用の第１、第２レール１１、１２および第３レール１３との配置関係を示す平面概要図である。It is a plane schematic diagram which shows the arrangement | positioning relationship between the 1st base 4a for X-ray detectors, and the 1st, 2nd rails 11 and 12 and 3rd rails 13 for X-ray detectors. Ｘ線検出器用第１台座４ａとＸ線検出器用の第１、第２レール１１、１２および第３レール１３との配置関係を示す側面概要図である。It is a side surface schematic diagram which shows the arrangement | positioning relationship between the 1st base 4a for X-ray detectors, the 1st, 2nd rails 11, 12 and 3rd rails 13 for X-ray detectors. Ｘ線検出器用の第１、第２レール１１、１２と第３レール１３との関係、および、Ｘ線管用の第１、第２レール２１、２２と第３レール２３との配置関係を示す平面概要図である。A plane showing the relationship between the first and second rails 11 and 12 for the X-ray detector and the third rail 13 and the arrangement relationship between the first and second rails 21 and 22 for the X-ray tube and the third rail 23. FIG. Ｘ線管用第１台座３ａとＸ線管用の第１、第２レール２１、２２および第３レール２３との配置関係を示す側面概要図である。It is a side surface schematic diagram which shows the arrangement | positioning relationship between the 1st base 3a for X-ray tubes, the 1st, 2nd rails 21 and 22 and the 3rd rails 23 for X-ray tubes. 従来のＸ線透視装置において、Ｘ線管またはＸ線検出器を支持した台座９３を互いに平行に配設された一対のレール９１、９２に沿って移動させる構成を示す概要図である。In the conventional X-ray fluoroscope, it is a schematic diagram which shows the structure which moves the base 93 which supported the X-ray tube or the X-ray detector along the pair of rails 91 and 92 arrange | positioned mutually parallel. 台座９３に位置ずれが生ずる状態を示す説明図である。It is explanatory drawing which shows the state which position shift arises in the base 93. FIG. 他の従来の実施形態に係る台座９３において位置ずれが生ずる状態を示す説明図である。It is explanatory drawing which shows the state which a position shift arises in the base 93 which concerns on another conventional embodiment.

以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明に係るＸ線透視装置を適用した放射線治療装置の斜視図である。また、図２は、放射線治療装置におけるヘッド５５およびヘッド支持部５４の揺動動作を示す説明図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a radiotherapy apparatus to which an X-ray fluoroscopic apparatus according to the present invention is applied. FIG. 2 is an explanatory diagram showing the swinging operation of the head 55 and the head support portion 54 in the radiotherapy apparatus.

この放射線治療装置は、撮影台５６上で横たわった被検者５７の患部に対してＸ線や電子線等の放射線を照射して放射線治療を行うためのものであり、治療室の床面５１上に設置されたガントリー５３と、このガントリー５３に対して水平方向を向く軸を中心として揺動するヘッド支持部５４と、このヘッド支持部５４に支持され、被検者５７に向けて放射線を照射するためのヘッド５５とを備える。ヘッド支持部５４の揺動動作により、ヘッド５５は、被検者５７の患部に対して、様々な角度から放射線を照射することが可能となる。 This radiotherapy apparatus is for performing radiotherapy by irradiating an affected part of a subject 57 lying on an imaging table 56 with radiation such as X-rays or electron beams, and the floor surface 51 of a treatment room. A gantry 53 installed above, a head support portion 54 that swings about an axis that faces the gantry 53 in the horizontal direction, and a head support portion 54 that is supported by the head support portion 54 and emits radiation toward the subject 57. And a head 55 for irradiation. The head 55 can irradiate the affected part of the subject 57 with radiation from various angles by the swinging motion of the head support part 54.

この放射線治療時においては、放射線を患部に正確に照射する必要がある。このため、患部付近には、マーカが設置される。そして、第１Ｘ線透視機構と第２Ｘ線透視機構とを使用して体内に埋め込まれたマーカを連続的に透視して、第１Ｘ線透視機構と第２Ｘ線透視機構により得た二次元の透視画像からマーカの三次元の位置情報を演算することで、マーカを高精度で検出する構成となっている。 During this radiotherapy, it is necessary to accurately irradiate the affected area with radiation. For this reason, a marker is installed near the affected area. Then, the two-dimensional fluoroscopy obtained by the first X-ray fluoroscopy mechanism and the second X-ray fluoroscopy mechanism is obtained by continuously fluoroscopying the marker embedded in the body using the first X-ray fluoroscopy mechanism and the second X-ray fluoroscopy mechanism. The marker is detected with high accuracy by calculating the three-dimensional position information of the marker from the image.

このような透視を実行するためのこの発明に係るＸ線透視装置は、第１Ｘ線管１ａと第１Ｘ線検出器２ａとから成る第１Ｘ線透視機構と、第２Ｘ線管１ｂと第２Ｘ線検出器２ｂとから成る第２Ｘ線透視機構と、これらの第１Ｘ線管１ａと第１Ｘ線検出器２ａとを互いに対向配置される後述する第１透視位置および第２透視位置に移動させるとともに、第２Ｘ線管１ｂと第２Ｘ線検出器２ｂとを互いに対向配置される第１透視位置および第２透視位置に移動させる移動機構とを備える。なお、第１、第２Ｘ線検出器２ａ、２ｂとしては、例えば、イメージインテンシファイア（Ｉ．Ｉ．）やフラットパネルディテクタ（ＦＰＤ）が使用される。 An X-ray fluoroscopic apparatus according to the present invention for performing such fluoroscopy includes a first X-ray fluoroscopic mechanism including a first X-ray tube 1a and a first X-ray detector 2a, a second X-ray tube 1b, and a second X-ray. The second X-ray fluoroscopic mechanism comprising the detector 2b, and the first X-ray tube 1a and the first X-ray detector 2a are moved to a first fluoroscopic position and a second fluoroscopic position, which will be described later, arranged opposite to each other, And a moving mechanism for moving the second X-ray tube 1b and the second X-ray detector 2b to a first fluoroscopic position and a second fluoroscopic position that are arranged to face each other. As the first and second X-ray detectors 2a and 2b, for example, an image intensifier (II) or a flat panel detector (FPD) is used.

第１Ｘ線管１ａは、Ｘ線管用第１台座３ａに支持されている。また、第２Ｘ線管１ｂは、Ｘ線管用第２台座３ｂに支持されている。撮影室の床面に形成された凹部の底面５２には、二つの直線部を円弧部を含む連結部により接続した略Ｕ字状のＸ線管用の第１レール２１と、このＸ線管用の第１レール２１と同様二つの直線部を円弧部を含む連結部により接続した略Ｕ字状のＸ線管用の第２レール２２とが配設されている。これらのＸ線管用の第１レール２１およびＸ線管用の第２レール２２は、互いに平行に配置されている。そして、Ｘ線管用第１台座３ａおよびＸ線管用第２台座３ｂは、これらのＸ線管用の第１、第２レール２１、２２により案内されて、後述する第１透視位置および第２透視位置に移動する。 The 1st X-ray tube 1a is supported by the 1st base 3a for X-ray tubes. The second X-ray tube 1b is supported by the second pedestal 3b for X-ray tubes. On the bottom surface 52 of the recess formed on the floor surface of the radiographing room, a first rail 21 for a substantially U-shaped X-ray tube in which two linear portions are connected by a connecting portion including an arc portion, and the X-ray tube Similar to the first rail 21, a substantially U-shaped second rail 22 for an X-ray tube is provided in which two straight portions are connected by a connecting portion including an arc portion. The first rail 21 for X-ray tube and the second rail 22 for X-ray tube are arranged in parallel to each other. The X-ray tube first pedestal 3a and the X-ray tube second pedestal 3b are guided by the first and second rails 21 and 22 for the X-ray tube, and will be described later in a first see-through position and a second see-through position. Move to.

同様に、第１Ｘ線検出器２ａは、Ｘ線検出器用第１台座４ａに支持されている。また、第２Ｘ線検出器２ｂは、Ｘ線検出器用第２台座４ｂに支持されている。撮影室の天井からは、二つの直線部を円弧部を含む連結部により接続した略Ｕ字状のＸ線検出器用の第１レール１１と、このＸ線検出器用の第１レール１１と同様二つの直線部を円弧部を含む連結部により接続した略Ｕ字状のＸ線検出器用の第２レール１２とが吊下されている。これらのＸ線検出器用の第１レール１１およびＸ線検出器用の第２レール１２は、互いに平行に配置されている。そして、Ｘ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂは、これらのＸ線検出器用の第１、第２レール１１、１２により案内されて、後述する第１透視位置および第２透視位置に移動する。 Similarly, the 1st X-ray detector 2a is supported by the 1st base 4a for X-ray detectors. The second X-ray detector 2b is supported by the second pedestal 4b for X-ray detectors. From the ceiling of the radiographing room, a first rail 11 for a substantially U-shaped X-ray detector in which two linear portions are connected by a connecting portion including an arc portion, and two similar to the first rail 11 for the X-ray detector. A substantially U-shaped second rail 12 for an X-ray detector, in which two straight portions are connected by a connecting portion including an arc portion, is suspended. The first rail 11 for the X-ray detector and the second rail 12 for the X-ray detector are arranged in parallel to each other. Then, the first pedestal 4a for X-ray detectors and the second pedestal 4b for X-ray detectors are guided by the first and second rails 11 and 12 for these X-ray detectors, and the first fluoroscopic position and the first to be described later. 2 Move to the fluoroscopic position.

図３は、第１Ｘ線管１ａ、第２Ｘ線管１ｂ、第１Ｘ線検出器２ａ、第２Ｘ線検出器２ｂが、各々、第１透視位置および第２透視位置に配置された状態を示す説明図である。 FIG. 3 is a diagram illustrating a state in which the first X-ray tube 1a, the second X-ray tube 1b, the first X-ray detector 2a, and the second X-ray detector 2b are disposed at the first fluoroscopic position and the second fluoroscopic position, respectively. FIG.

このＸ線透視装置は、予め設定された三つのポジションにおいて、被検者５７を互いに異なる二方向から透視する構成を有する。図３（ａ）は、第１Ｘ線管１ａ、第２Ｘ線管１ｂ、第１Ｘ線検出器２ａ、第２Ｘ線検出器２ｂが、第１のポジションにおいて、被検者５７を互いに異なる二方向から透視する状態を示し、図３（ｂ）は、第１Ｘ線管１ａ、第２Ｘ線管１ｂ、第１Ｘ線検出器２ａ、第２Ｘ線検出器２ｂが、第２のポジションにおいて、被検者５７を互いに異なる二方向から透視する状態を示し、図３（ｃ）は、第１Ｘ線管１ａ、第２Ｘ線管１ｂ、第１Ｘ線検出器２ａ、第２Ｘ線検出器２ｂが、第３のポジションにおいて、被検者５７を互いに異なる二方向から透視する状態を示している。 This X-ray fluoroscopic apparatus has a configuration in which a subject 57 is seen through from two different directions at three preset positions. FIG. 3A shows that the first X-ray tube 1a, the second X-ray tube 1b, the first X-ray detector 2a, and the second X-ray detector 2b move the subject 57 from two different directions at the first position. FIG. 3 (b) shows a state in which the first X-ray tube 1a, the second X-ray tube 1b, the first X-ray detector 2a, and the second X-ray detector 2b are in the second position. FIG. 3C shows a state in which the first X-ray tube 1a, the second X-ray tube 1b, the first X-ray detector 2a, and the second X-ray detector 2b are in the third position. Fig. 5 shows a state in which the subject 57 is seen through from two different directions.

このように、このＸ線透視装置は、三つのポジションにおいて被検者５７を互いに異なる二方向から透視する構成であることから、図２に示すように、放射線治療装置におけるヘッド５５が、被検者５７に対して様々な角度から放射線を照射する場合においても、ヘッド５５の移動に支障を来すことなくＸ線透視を実行することが可能となる。そして、このような三つのポジションにおいては、第１Ｘ線管１ａと第２Ｘ線管１ｂ、また、第１Ｘ線検出器２ａおよび第２Ｘ線検出器２ｂは、予め設定された第１透視位置または第２透視位置のいずれかの一方の位置に配置されることになる。 As described above, the X-ray fluoroscopic apparatus has a configuration in which the subject 57 is seen through from two different directions at three positions, and therefore, as shown in FIG. Even when the person 57 is irradiated with radiation from various angles, X-ray fluoroscopy can be performed without hindering the movement of the head 55. At these three positions, the first X-ray tube 1a and the second X-ray tube 1b, and the first X-ray detector 2a and the second X-ray detector 2b It will be arranged at one of the two perspective positions.

なお、図３（ａ）に示す第１のポジションにおいては、第１Ｘ線管１ａは第１透視位置に、第２Ｘ線管１ｂは第１透視位置に、第１Ｘ線検出器２ａは第１透視位置に、第２Ｘ線検出器２ｂは第１透視位置に、各々、配置される。図３（ｂ）に示す第２のポジションにおいては、第１Ｘ線管１ａは第２透視位置に、第２Ｘ線管１ｂは第１透視位置に、第１Ｘ線検出器２ａは第２透視位置に、第２Ｘ線検出器２ｂは第１透視位置に、各々、配置される。図３（ｃ）に示す第３のポジションにおいては、第１Ｘ線管１ａは第２透視位置に、第２Ｘ線管１ｂは第２透視位置に、第１Ｘ線検出器２ａは第２透視位置に、第２Ｘ線検出器２ｂは第２透視位置に、各々、配置される。 In the first position shown in FIG. 3A, the first X-ray tube 1a is at the first fluoroscopic position, the second X-ray tube 1b is at the first fluoroscopic position, and the first X-ray detector 2a is at the first fluoroscopic position. At the position, the second X-ray detectors 2b are respectively disposed at the first fluoroscopic positions. In the second position shown in FIG. 3B, the first X-ray tube 1a is in the second fluoroscopic position, the second X-ray tube 1b is in the first fluoroscopic position, and the first X-ray detector 2a is in the second fluoroscopic position. The second X-ray detectors 2b are respectively arranged at the first fluoroscopic positions. In the third position shown in FIG. 3C, the first X-ray tube 1a is in the second fluoroscopic position, the second X-ray tube 1b is in the second fluoroscopic position, and the first X-ray detector 2a is in the second fluoroscopic position. The second X-ray detectors 2b are respectively disposed at the second fluoroscopic positions.

Ｘ線管用第１台座３ａおよびＸ線管用第２台座３ｂが、Ｘ線管用の第１、第２レール２１、２２により構成される移動経路２０に沿って移動することにより、第１Ｘ線管１ａおよび第２Ｘ線管１ｂが、各々、第１透視位置および第２透視位置に配置される。また、Ｘ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂが、Ｘ線検出器用の第１、第２レール１１、１２により構成される移動経路１０に沿って移動することにより、第１Ｘ線検出器２ａおよび第２Ｘ線検出器２ｂが、各々、第１透視位置および第２透視位置に配置される。 The first X-ray tube 1a is moved by the X-ray tube first pedestal 3a and the X-ray tube second pedestal 3b moving along the moving path 20 constituted by the first and second rails 21 and 22 for the X-ray tube. And the 2nd X-ray tube 1b is each arrange | positioned in a 1st see-through position and a 2nd see-through position. Further, by moving the first pedestal 4a for X-ray detectors and the second pedestal 4b for X-ray detectors along the movement path 10 constituted by the first and second rails 11 and 12 for the X-ray detectors, The first X-ray detector 2a and the second X-ray detector 2b are disposed at the first perspective position and the second perspective position, respectively.

次に、上述したＸ線管用第１台座３ａおよびＸ線管用第２台座３ｂとＸ線管用の第１、第２レール２１、２２との配置関係、および、Ｘ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂとＸ線検出器用の第１、第２レール１１、１２との配置関係について説明する。図４は、Ｘ線検出器用第１台座４ａとＸ線検出器用の第１、第２レール１１、１２および第３レール１３との配置関係を示す平面概要図である。また、図５は、Ｘ線検出器用第１台座４ａとＸ線検出器用の第１、第２レール１１、１２および第３レール１３との配置関係を示す側面概要図である。さらに、図６は、Ｘ線検出器用の第１、第２レール１１、１２と第３レール１３との配置関係、および、Ｘ線管用の第１、第２レール２１、２２と第３レール２３との配置関係を示す平面概要図である。なお、図４においては、Ｘ線管用の第１、第２レール２１、２２は一部の領域のみを図示している。 Next, the arrangement relationship between the first pedestal 3a for X-ray tube and the second pedestal 3b for X-ray tube and the first and second rails 21 and 22 for the X-ray tube, and the first pedestal 4a for X-ray detector and The arrangement relationship between the second pedestal 4b for X-ray detectors and the first and second rails 11 and 12 for X-ray detectors will be described. FIG. 4 is a schematic plan view showing the positional relationship between the first pedestal 4a for the X-ray detector and the first, second rails 11 and 12 and the third rail 13 for the X-ray detector. FIG. 5 is a schematic side view showing the positional relationship between the first pedestal 4a for X-ray detectors and the first, second rails 11 and 12 and the third rail 13 for X-ray detectors. Further, FIG. 6 shows an arrangement relationship between the first and second rails 11 and 12 and the third rail 13 for the X-ray detector, and the first and second rails 21 and 22 and the third rail 23 for the X-ray tube. FIG. In FIG. 4, only a part of the X-ray tube first and second rails 21 and 22 is shown.

図４および図５に示すように、Ｘ線検出器用の第１レール１１と第２レール１２との間には、Ｘ線検出器用の第３レール１３が配設されている。このＸ線検出器用の第３レール１３は、直線状の形状を有し、Ｘ線検出器用の第１レール１１およびＸ線検出器用の第２レール１２における直線部と対向するそれらの中間の位置において、Ｘ線検出器用の第１レール１１およびＸ線検出器用の第２レール１２と平行に配設されている。そして、このＸ線検出器用の第３レール１３は、図６（ａ）に示すように、第１Ｘ線検出器２ａの第１透視位置と、第１Ｘ線検出器２ａの第２透視位置と、第２Ｘ線検出器２ｂの第１透視位置と、第２Ｘ線検出器２ｂの第２透視位置との４箇所の位置に配設されている。 As shown in FIGS. 4 and 5, a third rail 13 for the X-ray detector is disposed between the first rail 11 and the second rail 12 for the X-ray detector. The third rail 13 for the X-ray detector has a linear shape, and an intermediate position between the first rail 11 for the X-ray detector and the linear portion of the second rail 12 for the X-ray detector. The first rail 11 for the X-ray detector and the second rail 12 for the X-ray detector are arranged in parallel. Then, as shown in FIG. 6A, the third rail 13 for the X-ray detector includes a first fluoroscopic position of the first X-ray detector 2a, a second fluoroscopic position of the first X-ray detector 2a, The first X-ray detector 2b is disposed at four positions, ie, the first fluoroscopic position and the second X-ray detector 2b is the second fluoroscopic position.

図５に示すように、Ｘ線検出器用第１台座４ａには、Ｘ線検出器用の第１レール１１と当接して回転する第１車輪３１が配設されている。この第１車輪３１は、軸受４４により支持された軸４１を中心に回転可能な状態でＸ線検出器用第１台座４ａに固定されている。そして、軸４１はモータ５９と接続されており、第１車輪３１はモータ５９の駆動により回転する。 As shown in FIG. 5, a first wheel 31 that rotates in contact with the first rail 11 for the X-ray detector is disposed on the first base 4 a for the X-ray detector. The first wheel 31 is fixed to the X-ray detector first pedestal 4 a so as to be rotatable about a shaft 41 supported by a bearing 44. The shaft 41 is connected to the motor 59, and the first wheel 31 is rotated by driving the motor 59.

また、Ｘ線検出器用第１台座４ａには、Ｘ線検出器用の第２レール１２と当接して回転する第２車輪３２が配設されている。この第２車輪３２は、軸受４５により支持された軸４２を中心に回転する。軸受４５は、図５に示す左右方向に移動可能となっており、また、軸受４５とＸ線検出器用第１台座４ａに配設された固定金具４７との間にはバネ３４が配設されている。このため、第２車輪３２は、Ｘ線検出器用第１台座４ａに、第１車輪３１との距離を変更可能で、かつ、バネ３４の作用によりＸ線検出器用の第２レール１２に向けて付勢された状態でＸ線検出器用第１台座４ａに支持されている。 Further, a second wheel 32 that rotates in contact with the second rail 12 for the X-ray detector is disposed on the first pedestal 4a for the X-ray detector. The second wheel 32 rotates around the shaft 42 supported by the bearing 45. The bearing 45 is movable in the left-right direction shown in FIG. 5, and a spring 34 is disposed between the bearing 45 and the fixing bracket 47 disposed on the first pedestal 4a for the X-ray detector. ing. For this reason, the second wheel 32 can change the distance from the first wheel 31 to the first pedestal 4a for the X-ray detector, and is directed toward the second rail 12 for the X-ray detector by the action of the spring 34. The X-ray detector first pedestal 4a is supported in an energized state.

さらに、Ｘ線検出器用第１台座４ａには、Ｘ線検出器用の第３レール１３と当接して回転する第３車輪３３が配設されている。この第３車輪３３は、軸受４６により支持された軸４３を中心に回転可能な状態でＸ線検出器用第１台座４ａに固定されている。このため、第１車輪３１と第３車輪３３との距離は、一定となっている。 Furthermore, a third wheel 33 that rotates in contact with the third rail 13 for the X-ray detector is disposed on the first pedestal 4a for the X-ray detector. The third wheel 33 is fixed to the first pedestal 4a for X-ray detectors so as to be rotatable around a shaft 43 supported by a bearing 46. For this reason, the distance between the first wheel 31 and the third wheel 33 is constant.

図４および図５に示すように、Ｘ線検出器用の第３レール１３の下端部には、Ｘ線検出器用第１台座４ａに配設されたドッグ４９を検出することによりＸ線検出器用第１台座４ａの位置を確認するためのセンサ１０１が配設されている。Ｘ線検出器用第１台座４ａ自体は、図示しない支持機構によって、Ｘ線検出器用の第１、第２レール１１、１２により支持されている。 As shown in FIGS. 4 and 5, at the lower end of the X-ray detector third rail 13, a dog 49 disposed on the first X-ray detector seat 4a is detected to detect the X-ray detector second. A sensor 101 for confirming the position of the single seat 4a is provided. The first X-ray detector base 4a itself is supported by X-ray detector first and second rails 11 and 12 by a support mechanism (not shown).

なお、Ｘ線検出器用第２台座４ｂは、上述したＸ線検出器用第１台座４ａと同様の構成を有する。 In addition, the 2nd base 4b for X-ray detectors has the structure similar to the 1st base 4a for X-ray detectors mentioned above.

このような構成を有するＸ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂにおいては、モータ５９の駆動により第１車輪３１を回転させることにより、Ｘ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂをＸ線検出器用の第１レール１１および第２レール１２に沿って移動させることが可能となる。このとき、第１車輪３１と第２車輪３２との距離が変更可能であることから、Ｘ線検出器用の第１レール１１および第２レール１２が直線部と円弧部とから構成されている場合においても、Ｘ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂをＸ線検出器用の第１、第２レール１１、１２における直線部と円弧部との両方に沿って、スムースに移動させることが可能となる。 In the X-ray detector first pedestal 4a and the X-ray detector second pedestal 4b having such a configuration, the first wheel 31 is rotated by driving the motor 59, whereby the first X-ray detector pedestal 4a and The second X-ray detector base 4b can be moved along the first rail 11 and the second rail 12 for the X-ray detector. At this time, since the distance between the first wheel 31 and the second wheel 32 can be changed, the first rail 11 and the second rail 12 for the X-ray detector are composed of a straight portion and an arc portion. Also, the X-ray detector first pedestal 4a and the X-ray detector second pedestal 4b are smoothly moved along both the straight and arc portions of the first and second rails 11 and 12 for the X-ray detector. It can be moved.

そして、図３(ａ)に示すように、第１Ｘ線検出器２ａの第１、第２透視位置および第２Ｘ線検出器２ｂの第１、第２透視位置の４箇所の位置においてＸ線検出器用の第１レール１１と第２レール１２との間に第３レール１３が配設されるとともに、この第３レール１３に当接する第３車輪３３と第１レール１１に当接する第１車輪３１との距離が一定となっていることから、Ｘ線検出器用の第１レール１１および第２レール１２に対するＸ線検出器用第１台座４ａおよびＸ線検出器用第２台座４ｂの姿勢を一定に維持することが可能となる。このため、図９に示す従来技術のように、Ｘ線検出器用第１台座４ａまたはＸ線検出器用第２台座４ｂが傾斜して、Ｘ線検出器用第１台座４ａまたはＸ線検出器用第２台座４ｂにより支持された第１Ｘ線検出器２ａまたは第２Ｘ線検出器２ｂに位置ずれが生じることを防止することが可能となる。 Then, as shown in FIG. 3 (a), X-ray detection is performed at the four positions of the first and second fluoroscopic positions of the first X-ray detector 2a and the first and second fluoroscopic positions of the second X-ray detector 2b. A third rail 13 is disposed between the dexterous first rail 11 and the second rail 12, and a third wheel 33 that contacts the third rail 13 and a first wheel 31 that contacts the first rail 11. Since the distance to the X-ray detector is constant, the posture of the first X-ray detector base 4a and the second X-ray detector base 4b with respect to the first rail 11 and the second rail 12 for the X-ray detector is maintained constant. It becomes possible to do. For this reason, as in the prior art shown in FIG. 9, the first pedestal 4a for X-ray detectors or the second pedestal 4b for X-ray detectors is inclined, and the first pedestal 4a for X-ray detectors or the second X-ray detector second It is possible to prevent displacement of the first X-ray detector 2a or the second X-ray detector 2b supported by the pedestal 4b.

図７は、Ｘ線管用第１台座３ａとＸ線管用の第１、第２レール２１、２２および第３レール２３との配置関係を示す側面概要図である。なお、図５に示す部材と対応する部材については、同一の符号を付している。 FIG. 7 is a schematic side view showing the positional relationship between the first pedestal 3a for X-ray tubes and the first and second rails 21, 22 and the third rail 23 for X-ray tubes. In addition, the same code | symbol is attached | subjected about the member corresponding to the member shown in FIG.

図７に示すように、Ｘ線管用の第１レール２１と第２レール２２との間には、Ｘ線管用の第３レール２３が配設されている。このＸ線管用の第３レール２３は、直線状の形状を有し、Ｘ線管用の第１レール２１およびＸ線管用の第２レール２２における直線部と対向するそれらの中間の位置において、Ｘ線管用の第１レール２１およびＸ線管用の第２レール２２と平行に配設されている。そして、このＸ線管用の第３レール２３は、図６（ｂ）に示すように、第１Ｘ線管１ａの第１透視位置と、第１Ｘ線管１ａの第２透視位置と、第２Ｘ線管１ｂの第１透視位置と、第２Ｘ線管１ｂの第２透視位置との４箇所の位置に配設されている。 As shown in FIG. 7, a third rail 23 for the X-ray tube is disposed between the first rail 21 and the second rail 22 for the X-ray tube. The third rail 23 for the X-ray tube has a linear shape, and at an intermediate position facing the straight portion of the first rail 21 for the X-ray tube and the second rail 22 for the X-ray tube, The first rail 21 for the X-ray tube and the second rail 22 for the X-ray tube are arranged in parallel. Then, as shown in FIG. 6B, the third rail 23 for the X-ray tube includes a first fluoroscopic position of the first X-ray tube 1a, a second fluoroscopic position of the first X-ray tube 1a, and a second X-ray. It is disposed at four positions, a first perspective position of the tube 1b and a second perspective position of the second X-ray tube 1b.

図７に示すように、Ｘ線管用第１台座３ａには、Ｘ線管用の第１レール２１と当接して回転する第１車輪３１が配設されている。この第１車輪３１は、軸受４４により支持された軸４１を中心に回転可能な状態でＸ線管用第１台座３ａに固定されている。そして、軸４１はモータ５９と接続されており、第１車輪３１はモータ５９の駆動により回転する。 As shown in FIG. 7, a first wheel 31 that rotates in contact with the first rail 21 for the X-ray tube is disposed on the first pedestal 3a for the X-ray tube. The first wheel 31 is fixed to the first pedestal 3a for the X-ray tube so as to be rotatable around a shaft 41 supported by a bearing 44. The shaft 41 is connected to the motor 59, and the first wheel 31 is rotated by driving the motor 59.

また、Ｘ線管用第１台座３ａには、Ｘ線管用の第２レール２２と当接して回転する第２車輪３２が配設されている。この第２車輪３２は、軸受４５により支持された軸４２を中心に回転する。軸受４５は、図７に示す左右方向に移動可能となっており、また、軸受４５とＸ線管用第１台座３ａに配設された固定金具４７との間にはバネ３４が配設されている。このため、第２車輪３２は、Ｘ線管用第１台座３ａに、第１車輪３１との距離を変更可能で、かつ、バネ３４の作用によりＸ線管用の第２レール２２に向けて付勢された状態でＸ線管用第１台座３ａに支持されている。 The first pedestal 3a for the X-ray tube is provided with a second wheel 32 that rotates in contact with the second rail 22 for the X-ray tube. The second wheel 32 rotates around the shaft 42 supported by the bearing 45. The bearing 45 is movable in the left-right direction shown in FIG. 7, and a spring 34 is disposed between the bearing 45 and the fixing bracket 47 disposed on the first X-ray tube base 3a. Yes. For this reason, the second wheel 32 is urged toward the first rail 3 for the X-ray tube by the action of the spring 34 so that the distance from the first wheel 31 can be changed on the first pedestal 3a for the X-ray tube. In this state, the first pedestal 3a for X-ray tube is supported.

さらに、Ｘ線管用第１台座３ａには、Ｘ線管用の第３レール２３と当接して回転する第３車輪３３が配設されている。この第３車輪３３は、軸受４６により支持された軸４３を中心に回転可能な状態でＸ線管用第１台座３ａに固定されている。このため、第１車輪３１と第３車輪３３との距離は、一定となっている。 Further, the first pedestal 3a for the X-ray tube is provided with a third wheel 33 that rotates in contact with the third rail 23 for the X-ray tube. The third wheel 33 is fixed to the first pedestal 3 a for X-ray tube so as to be rotatable around a shaft 43 supported by a bearing 46. For this reason, the distance between the first wheel 31 and the third wheel 33 is constant.

Ｘ線管用の第３レール２３の上端部には、Ｘ線管用第１台座３ａに配設されたドッグ４９を検出することによりＸ線管用第１台座３ａの位置を確認するためのセンサ１０１が配設されている。Ｘ線管用第１台座３ａ自体は、図示しない支持機構によって、Ｘ線管用の第１、第２レール２１、２２により支持されている。 A sensor 101 for confirming the position of the first pedestal 3a for the X-ray tube by detecting a dog 49 disposed on the first pedestal 3a for the X-ray tube is provided at the upper end of the third rail 23 for the X-ray tube. It is arranged. The first X-ray tube pedestal 3a itself is supported by X-ray tube first and second rails 21 and 22 by a support mechanism (not shown).

なお、Ｘ線管用第２台座３ｂは、上述したＸ線管用第１台座３ａと同様の構成を有する。 The second X-ray tube pedestal 3b has the same configuration as the X-ray tube first pedestal 3a described above.

このような構成を有するＸ線管用第１台座３ａおよびＸ線管用第２台座３ｂにおいては、モータ５９の駆動により第１車輪３１を回転させることにより、Ｘ線管用第１台座３ａおよびＸ線管用第２台座３ｂをＸ線管用の第１レール２１および第２レール２２に沿って移動させることが可能となる。このとき、第１車輪３１と第２車輪３２との距離が変更可能であることから、Ｘ線管用の第１レール２１および第２レール２２が直線部と円弧部とから構成されている場合においても、Ｘ線管用第１台座３ａおよびＸ線管用第２台座３ｂをＸ線管用の第１、第２レール２１、２２における直線部と円弧部との両方に沿って、スムースに移動させることが可能となる。 In the X-ray tube first pedestal 3a and the X-ray tube second pedestal 3b having such a configuration, the first wheel 31 is rotated by driving the motor 59, whereby the X-ray tube first pedestal 3a and the X-ray tube use. The second pedestal 3b can be moved along the first rail 21 and the second rail 22 for the X-ray tube. At this time, since the distance between the first wheel 31 and the second wheel 32 can be changed, in the case where the first rail 21 and the second rail 22 for the X-ray tube are composed of a straight portion and an arc portion. In addition, the first pedestal 3a for X-ray tube and the second pedestal 3b for X-ray tube can be smoothly moved along both the straight portion and the arc portion of the first and second rails 21 and 22 for the X-ray tube. It becomes possible.

そして、図３（ｂ）に示すように、第１Ｘ線管１ａの第１、第２透視位置および第２Ｘ線管１ｂの第１、第２透視位置の４箇所の位置においてＸ線管用の第１レール２１と第２レール２２との間に第３レール２３が配設されるとともに、この第３レール２３に当接する第３車輪３３と第１レール２１に当接する第１車輪３１との距離が一定となっていることから、Ｘ線管用の第１レール２１および第２レール２２に対するＸ線管用第１台座３ａおよびＸ線管用第２台座３ｂの姿勢を一定に維持することが可能となる。このため、図９に示す従来技術のように、Ｘ線管用第１台座３ａまたはＸ線管用第２台座３ｂが傾斜して、Ｘ線管用第１台座３ａまたはＸ線管用第２台座３ｂにより支持された第１Ｘ線管１ａまたは第２Ｘ線管１ｂに位置ずれが生じることを防止することが可能となる。 Then, as shown in FIG. 3 (b), the X-ray tube for the first X-ray tube at the four positions of the first and second fluoroscopic positions of the first X-ray tube 1a and the first and second fluoroscopic positions of the second X-ray tube 1b. The third rail 23 is disposed between the first rail 21 and the second rail 22, and the distance between the third wheel 33 that contacts the third rail 23 and the first wheel 31 that contacts the first rail 21. Therefore, the postures of the first X-ray tube pedestal 3a and the second X-ray tube pedestal 3b with respect to the first rail 21 and the second rail 22 for the X-ray tube can be maintained constant. . Therefore, as in the prior art shown in FIG. 9, the first pedestal 3a for X-ray tube or the second pedestal 3b for X-ray tube is inclined and supported by the first pedestal 3a for X-ray tube or the second pedestal 3b for X-ray tube. It is possible to prevent the displacement of the first X-ray tube 1a or the second X-ray tube 1b.

なお、上述した実施形態においては、固定された単一の第１車輪３１と移動可能な一対の第２車輪３２とを使用しているが、図１０に示す従来の実施形態と同様、固定された車輪を一対使用するとともに、移動可能な車輪を一つだけ使用するようにしてもよい。 In the above-described embodiment, a single fixed first wheel 31 and a pair of movable second wheels 32 are used. However, as in the conventional embodiment shown in FIG. A pair of wheels may be used, and only one movable wheel may be used.

また、上述した実施形態においては、Ｘ線検出器用の第３レール１３を第１Ｘ線検出器２ａおよび第２Ｘ線検出器２ｂにおける透視位置付近にのみ配設し、Ｘ線管用の第３レール２３を第１Ｘ線管１ａおよび第２Ｘ線管１ｂにおける透視位置付近にのみ配設している。このため、第３レール１３、２３を必要最小限の位置に配置しながら正確なＸ線透視を実行し得るばかりではなく、透視位置付近以外の位置においては、駆動に要するトルクや振動を小さなものとすることが可能となる。しかしながら、Ｘ線検出器用の第３レール１３をＸ線検出器用の第１、第２レール１１、１２における直線部に対応する全領域に配設し、Ｘ線管用の第３レール２３をＸ線管用の第１、第２レール２１、２２における直線部に対応する全領域に配設するようにしてもよい。すなわち、これらのＸ線検出器用第３レールおよびＸ線管用第３レールは、少なくとも透視位置に配設されていればよい。 In the above-described embodiment, the third rail 13 for the X-ray detector is disposed only near the fluoroscopic position in the first X-ray detector 2a and the second X-ray detector 2b, and the third rail 23 for the X-ray tube. Is disposed only in the vicinity of the fluoroscopic position in the first X-ray tube 1a and the second X-ray tube 1b. For this reason, not only accurate X-ray fluoroscopy can be performed while the third rails 13 and 23 are disposed at the minimum necessary positions, but torque and vibration required for driving are small at positions other than near the fluoroscopic positions. It becomes possible. However, the third rail 13 for the X-ray detector is disposed in the entire region corresponding to the straight line portion of the first and second rails 11 and 12 for the X-ray detector, and the third rail 23 for the X-ray tube is disposed of the X-ray detector. You may make it arrange | position in the whole area | region corresponding to the linear part in the 1st, 2nd rails 21 and 22 for pipes. That is, it is only necessary that the third rail for X-ray detector and the third rail for X-ray tube are disposed at least in the see-through position.

１ａ第１Ｘ線管
１ｂ第２Ｘ線管
２ａ第１Ｘ線検出器
２ｂ第２Ｘ線検出器
３ａＸ線管用第１台座
３ｂＸ線管用第２台座
４ａＸ線検出器用第１台座
４ｂＸ線検出器用第２台座
１１第１レール
１２第２レール
１３第３レール
２１第１レール
２２第２レール
２３第３レール
３１第１車輪
３２第２車輪
３３第３車輪
３４バネ
５２底面
５３ガントリー
５４ヘッド支持部
５５ヘッド
５６撮影台
５７被検者
５８天井
５９モータ
DESCRIPTION OF SYMBOLS 1a 1st X-ray tube 1b 2nd X-ray tube 2a 1st X-ray detector 2b 2nd X-ray detector 3a 1st seat for X-ray tubes 3b 2nd seat for X-ray tubes 4a 1st seat for X-ray detectors 4b 1st seat for X-ray detectors 2 pedestals 11 1st rail 12 2nd rail 13 3rd rail 21 1st rail 22 2nd rail 23 3rd rail 31 1st wheel 32 2nd wheel 33 3rd wheel 34 spring 52 bottom surface 53 gantry 54 head support section 55 head 56 Imaging stand 57 Subject 58 Ceiling 59 Motor

Claims

An X-ray tube that emits X-rays;
An X-ray detector for converting the X-ray into an image signal;
A pedestal that supports the X-ray tube or the X-ray detector;
First and second rails, each having a straight line portion and an arc portion, for guiding the pedestal by being arranged in parallel with each other;
A first wheel disposed on the pedestal and rotating in contact with the first rail;
A second wheel disposed on the pedestal and rotating in contact with the second rail;
Urging means for urging the second wheel toward the second rail;
A linear third rail disposed in parallel with the first rail and the second rail at a position facing the linear portion of the first rail and the second rail;
A third wheel disposed on the pedestal and rotating in contact with the third rail;
An X-ray fluoroscopic apparatus comprising:

The X-ray fluoroscopy device according to claim 1,
The third rail is an X-ray fluoroscopy device disposed in the vicinity of a preset fluoroscopic position in the X-ray tube or the X-ray detector.

The X-ray fluoroscopic apparatus according to claim 2,
The X-ray fluoroscopic apparatus, wherein the third rail is disposed at a position between the first rail and the second rail.

A first X-ray fluoroscopic mechanism comprising a first X-ray tube that irradiates X-rays and a first X-ray detector that converts the X-rays into image signals, a second X-ray tube that irradiates X-rays, and the X-rays as image signals A second X-ray fluoroscopic mechanism comprising a second X-ray detector that converts to
The first X-ray tube and the first X-ray detector are moved to a preset first fluoroscopic position and second fluoroscopic position that are arranged opposite to each other, and the second X-ray tube and the second X-ray detector are moved to each other. And a moving mechanism that moves the first perspective position and the second perspective position, which are arranged opposite to each other,
In an X-ray fluoroscopic apparatus comprising:
The moving mechanism is
A first pedestal for an X-ray tube that supports the first X-ray tube;
A second pedestal for an X-ray tube that supports the second X-ray tube;
A straight line portion disposed at a first see-through position in the first X-ray tube and the second X-ray tube; a straight line portion disposed at a second see-through position in the first X-ray tube and the second X-ray tube; and A connecting portion having a circular arc portion for connecting the straight portions, and arranged in parallel to each other to guide the first pedestal for X-ray tube and the second pedestal for X-ray tube. 1, the second rail,
A first wheel disposed on each of the first X-ray tube pedestal and the second X-ray tube pedestal and rotating in contact with the first rail for the X-ray tube;
A second wheel disposed on each of the first X-ray tube pedestal and the second X-ray tube pedestal and rotating in contact with the second X-ray tube rail;
Biasing means for biasing the second wheel toward the second rail for the X-ray tube;
The first rail for the X-ray tube and the second rail for the X-ray tube are arranged in parallel to the first rail for the X-ray tube and the second rail for the X-ray tube at a position facing the straight portion of the first rail for the X-ray tube and the second rail for the X-ray tube. A third rail for a straight X-ray tube;
A third wheel disposed on each of the first X-ray tube pedestal and the second X-ray tube pedestal and rotating in contact with a third rail for the X-ray tube;
A first pedestal for an X-ray detector supporting the first X-ray detector;
A second pedestal for an X-ray detector that supports the second X-ray detector;
A straight line portion disposed at a first fluoroscopic position in the first X-ray detector and the second X-ray detector, and a straight line portion disposed at a second fluoroscopic position in the first X-ray detector and the second X-ray detector. And a connecting portion having a circular arc portion for connecting these linear portions, and arranged in parallel to each other, thereby guiding the first pedestal for X-ray detector and the second pedestal for X-ray detector. First and second rails for X-ray detectors to
A first wheel disposed on each of the first X-ray detector pedestal and the second X-ray detector pedestal and rotating in contact with the first X-ray detector rail;
A second wheel disposed on each of the first X-ray detector pedestal and the second X-ray detector pedestal and rotating in contact with the second X-ray detector rail;
Biasing means for biasing the second wheel toward the second rail for the X-ray detector;
The first rail for the X-ray detector and the second rail for the X-ray detector are parallel to the first rail for the X-ray detector and the second rail for the X-ray detector at a position facing the linear portion of the first rail for the X-ray detector and the second rail for the X-ray detector. A third rail for a linear X-ray detector disposed;
A third wheel disposed on each of the first X-ray detector pedestal and the second X-ray detector pedestal and rotating in contact with a third rail for the X-ray detector;
An X-ray fluoroscopic apparatus comprising: