JP6362320B2 - Breast tomography equipment - Google Patents

Breast tomography equipment Download PDF

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JP6362320B2
JP6362320B2 JP2013239625A JP2013239625A JP6362320B2 JP 6362320 B2 JP6362320 B2 JP 6362320B2 JP 2013239625 A JP2013239625 A JP 2013239625A JP 2013239625 A JP2013239625 A JP 2013239625A JP 6362320 B2 JP6362320 B2 JP 6362320B2
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ray detector
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JP2015097692A5 (en
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川瀬 順也
順也 川瀬
靖浩 伊藤
靖浩 伊藤
塚本 健夫
健夫 塚本
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Canon Inc
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Description

本発明は、コンピュータ断層撮影(CT撮影)を行う断層撮影装置に関し、特に乳房の撮影に用いるマンモ断層撮影装置(マンモCT装置)に関する。   The present invention relates to a tomography apparatus that performs computed tomography (CT imaging), and more particularly to a mammography tomography apparatus (mammo CT apparatus) used for imaging a breast.

従来、触診と超音波診断を用いて乳がん検査を行っていたが、CT撮影を使った三次元(3D)画像により乳房撮影を行なうことができるマンモCT装置が開発されてきた。   Conventionally, breast cancer examinations have been performed using palpation and ultrasonic diagnosis, but mammo CT apparatuses capable of performing mammography using three-dimensional (3D) images using CT imaging have been developed.

特許文献1は、マンモCT装置の一例を開示している。特許文献1に開示されたマンモCT装置は、乳房入出口が開いた天板と、乳房入出口の周りを水平方向に回転する測定装置部と、X線発生装置と、X線検出器とで構成されている。CT撮影時、被者は天板に俯せに寝そべり、乳房入出口から乳房収納部に乳房を挿入した状態で撮影が行なわれる。撮影は、X線照射領域を規定するコリメータを内蔵したX線発生装置とX線検出器が乳房収納部内を通る回転軸の周りを回転しながら、所定角度位置ごとに行われ、各方向から見た被検体のX線透過画像を取得する。また、天板の下面にはX線の人体への漏洩を遮断するためのX線遮蔽体が取り付けられている。 Patent Document 1 discloses an example of a mammo CT apparatus. The mammo CT apparatus disclosed in Patent Document 1 includes a top plate with an open / closed breast entrance, a measurement device that rotates horizontally around the breast entrance / exit, an X-ray generator, and an X-ray detector. It is configured. When CT imaging, the test person Nesoberi prone to the top plate, shot while inserting the breast the breast receiving portion from the breast inlet and outlet is made. The X-ray generator and X-ray detector with a built-in collimator that defines the X-ray irradiation area are rotated at a predetermined angular position while rotating around the rotation axis passing through the breast housing, and viewed from each direction. An X-ray transmission image of the subject is acquired. In addition, an X-ray shield for blocking leakage of X-rays to the human body is attached to the lower surface of the top plate.

アメリカ特許第6987831号明細書US Pat. No. 6,987,831

特許文献1のようなマンモCT装置においては、天板上面に被者の胸骨を当てながら乳房を乳房入出口から乳房収納部に挿入する。これにより、乳房収納部に照射されるX線の照射エリア内に乳房が重なることで、X線検出器上にX線透過像を投影し撮影することが可能となる。マンモCT装置では、胸骨側の乳房(付根部)も極力撮影可能となるように、X線検出器をできるだけ天板側に近付けておくことが好ましい。 In breast CT apparatus of Patent Document 1, the breast while applying a sternum of the test person on the top plate upper surface for inserting the breast inlet and outlet to the breast receiving portion. As a result, the breast overlaps within the X-ray irradiation area irradiated to the breast storage section, so that an X-ray transmission image can be projected and photographed on the X-ray detector. In the mammo CT apparatus, it is preferable to place the X-ray detector as close to the top plate as possible so that the breast (root) on the sternum side can be imaged as much as possible.

ところで、X線検出器は、X線検出素子によるX線の検出が行われる中央部の検出エリアと、配線回路などがレイアウトされ、X線の検出ができない周縁部の非検出エリアを有する。乳房の付け根部まで撮影可能とするには、検出エリアを天板に近付ける必要があるが、周縁部の非検出エリアの存在により、検出エリアと天板とを近付けにくい問題がある。また、被者側へのX線の漏洩を防止するため、天板の内側にはX線遮蔽体が設けられている。X線検出器を天板に近づけると、これと干渉するため、ある一定以上にはX線検出器を近づけることができない。 By the way, the X-ray detector has a detection area at the center where X-ray detection is performed by the X-ray detection element, and a non-detection area at the periphery where a wiring circuit and the like cannot be laid out and cannot be detected. In order to be able to image the base of the breast, it is necessary to bring the detection area close to the top plate. In order to prevent the leakage of X-ray to the test side, the X-ray shield is provided inside of the top plate. When the X-ray detector is brought close to the top plate, it interferes with this, so the X-ray detector cannot be brought closer than a certain level.

そこで本発明の目的は、X線に代表される放射線を用いたマンモCT装置において、放射線検出器の検出エリアを被者側へ近づけることにより乳房付根部までの放射線撮影を可能とすることにある。 An object of the present invention is in breast CT apparatus using the radiation represented by X-ray, the detection area of the radiation detector to enable the radiation imaging to breast base portion by approaching to the test side is there.

本発明の第1は、乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線遮蔽部は、前記前面板の内周側に位置する内周X線遮蔽部と、隙間を介して前記内周X線遮蔽部の外側に位置する外周X線遮蔽部とを有し、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする。
本発明の第2は、乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線遮蔽部の外周縁と前記前面板の外周縁との間に隙間が設けられ、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする。
本発明の第3は、乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線放出部から見て、前記X線検出器が前記X線遮蔽部の手前に重なる部分を有することを特徴とする。
本発明の第4は、乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線検出器は、前記径方向において外側に凸に湾曲し、前記X線検出器の曲率中心は、前記回転軸に重なって位置していることを特徴とする。
The first of the present invention includes a gantry having a front plate breast insertion opening is provided to the breast is inserted, a breast insertion portion continuous to the breast insertion opening, and
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector, have a portion overlapping with the X-ray shielding section in a radial direction perpendicular to the rotating shaft,
The X-ray shielding part has an inner circumferential X-ray shielding part located on the inner circumferential side of the front plate, and an outer circumferential X-ray shielding part located outside the inner circumferential X-ray shielding part via a gap. , within the gap, as viewed from the X-ray emitting portion, the X-ray detector you characterized in that overlaps the X-ray shielding portion.
According to a second aspect of the present invention, a gantry having a front plate provided with a breast insertion opening into which a breast is inserted, and a breast insertion section connected to the breast insertion opening,
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
A gap is provided between the outer peripheral edge of the X-ray shielding part and the outer peripheral edge of the front plate, and the X-ray detector is connected to the X-ray shielding part in the gap as viewed from the X-ray emission part. It is characterized by overlapping.
According to a third aspect of the present invention, a gantry having a front plate provided with a breast insertion opening into which a breast is inserted, and a breast insertion section connected to the breast insertion opening,
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
The X-ray detector has a portion that overlaps in front of the X-ray shielding portion when viewed from the X-ray emission portion.
A fourth aspect of the present invention is a gantry having a front plate provided with a breast insertion opening into which a breast is inserted, and a breast insertion section connected to the breast insertion opening,
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
The X-ray detector is convexly curved outward in the radial direction, and the center of curvature of the X-ray detector is positioned so as to overlap the rotation axis.

本発明においては、放射線遮蔽体が、放射線検出器の回転移動経路に対応する環状の隙間を開けて設けられていると共に、放射線検出器の前面板と対向する側の端部がこの隙間の内側に入り込んでいる。つまり、放射線検出器の前面板と対向する側の端部が、放射線遮蔽体の表面より前面板の側に入り込んでいるので、放射線遮蔽体に接して放射線検出器を設けた場合に比しても、最大で放射線遮蔽体の厚さ分だけ分放射線検出器を前面板に近づけられる。これにより、放射線検出器の検出エリアを被者に近づけることができ、乳房付根部までの放射線撮影が可能となる。また、放射線遮蔽体により、被験者への余剰な放射線の漏洩を防止することができる。 In the present invention, the radiation shield is provided with an annular gap corresponding to the rotational movement path of the radiation detector, and the end on the side facing the front plate of the radiation detector is located inside the gap. I'm stuck in. In other words, since the end of the radiation detector facing the front plate enters the front plate side from the surface of the radiation shield, compared with the case where the radiation detector is provided in contact with the radiation shield. However, the radiation detector can be brought closer to the front plate by the thickness of the radiation shield at the maximum. Accordingly, the detection area of the radiation detector can be brought close to the test person, it is possible to radiography to breast base portion. Moreover, leakage of excess radiation to the subject can be prevented by the radiation shield.

マンモ断層撮影装置(マンモCT装置)の全体斜視図である。It is a whole perspective view of a mammography apparatus (mammo CT apparatus). 本発明の第1の例のマンモCT装置の断面図で、(a)は図1におけるX方向から見た断面図、(b)は図1におけるY方向から見た断面図である。It is sectional drawing of the mammo CT apparatus of the 1st example of this invention, (a) is sectional drawing seen from the X direction in FIG. 1, (b) is sectional drawing seen from the Y direction in FIG. 図2(a)における放射線発生管からコリメータ周りの拡大図である。FIG. 3 is an enlarged view around the collimator from the radiation generating tube in FIG. 本発明のマンモCT装置の撮影システムの構成図である。It is a block diagram of the imaging | photography system of the mammo CT apparatus of this invention. 本発明の第2の例のマンモCT装置の断面図で、(a)は図1におけるX方向から見た断面図、(b)は図1におけるY方向から見た断面図である。It is sectional drawing of the mammo CT apparatus of the 2nd example of this invention, (a) is sectional drawing seen from the X direction in FIG. 1, (b) is sectional drawing seen from the Y direction in FIG. 本発明の第3の例のマンモCT装置の断面図で、(a)は図1におけるX方向から見た断面図、(b)は図1におけるY方向から見た断面図である。It is sectional drawing of the mammo CT apparatus of the 3rd example of this invention, (a) is sectional drawing seen from the X direction in FIG. 1, (b) is sectional drawing seen from the Y direction in FIG. 本発明の第4の例のマンモCT装置の断面図で、(a)は図1におけるX方向から見た断面図、(b)Y方向から見た断面図である。It is sectional drawing of the mammo CT apparatus of the 4th example of this invention, (a) is sectional drawing seen from the X direction in FIG. 1, (b) It is sectional drawing seen from the Y direction. 本発明の第5の例のマンモCT装置断面図で、(a)は図1におけるX方向から見た断面図、(b)は図1におけるY方向から見た断面図である。FIG. 6 is a cross-sectional view of a mammo CT apparatus according to a fifth example of the present invention, where (a) is a cross-sectional view seen from the X direction in FIG. 1, and (b) is a cross-sectional view seen from the Y direction in FIG.

以下、図面を参照しながら本発明を実施するための形態について説明する。なお、以下に参照する図面において、同じ符号は同様の構成要素を示す。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings referred to below, the same reference numerals indicate the same components.

〔第1の例〕
<マンモCT装置の概要>
図1乃至図3に示されるように、マンモ断層撮影装置(マンモCT装置)1は、内部に放射線源や放射線検出器11などが収納された部屋を構成するガントリ2を有している。また、ガントリ2は、その中心部に、被者Pが乳房15を挿入するための乳房収納部3を備えている。なお、4は支持部である。
[First example]
<Outline of mammo CT system>
As shown in FIGS. 1 to 3, a mammographic tomography apparatus (mammo CT apparatus) 1 has a gantry 2 constituting a room in which a radiation source, a radiation detector 11 and the like are housed. Also, the gantry 2, at the center thereof, and a breast receiving portion 3 for the test person P inserts the breast 15. In addition, 4 is a support part.

ガントリ2は、乳房収納部3を囲む内周板5と、外周を囲む外周板6と、前面側で内周板5と外周板6とを接続する前面板7と、背面側を覆う不図示の背面板とを有する中空円盤状部材である。前面板7は、中央部に、乳房収納部3へ乳房15を入出するための乳房入出口17が開口した環状をなしている。ガントリ2の内側には、放射線発生管8と、放射線検出器11とが回転板(不図示)に支持されており、CT撮影時に、回転駆動部101(図4参照)により両者一体で回転される構成となっている。この回転は、乳房収納部3の内側を通って、乳房収納部3への乳房15の入出方向(Z方向)に延びる回転軸D周りに行われる。放射線発生管8及び放射線検出器11は同一角速度で同方向に回転されることになる。マンモCT装置1での撮影時、被者Pはガントリ2の前面板7の表面側から、乳房入出口17から乳房収納部3へ乳房15を挿入し、この姿勢を維持しながらCT撮影を行う。なお、本例のマンモCT装置1は、前面板7を縦にして設置し、前面板7の前に被験者Pが立って検査を受ける形式のものである。しかし、本発明に係るマンモCT装置1は、前面板7を横にして設置して前面板7を背景技術で説明した天板とし、前面板7上に被験者が俯せに横たわって検査を受ける形式のものとすることもできる。この場合、内周板5を省略することも可能である。 The gantry 2 includes an inner peripheral plate 5 that surrounds the breast storage unit 3, an outer peripheral plate 6 that surrounds the outer periphery, a front plate 7 that connects the inner peripheral plate 5 and the outer peripheral plate 6 on the front side, and a back side that is not shown. It is a hollow disk-shaped member which has a back plate. The front plate 7 has an annular shape in which a breast entrance / exit 17 for entering / exiting the breast 15 into / from the breast accommodating part 3 is opened at the center. Inside the gantry 2, a radiation generating tube 8 and a radiation detector 11 are supported by a rotating plate (not shown), and are rotated together by a rotation drive unit 101 (see FIG. 4) during CT imaging. It is the composition which becomes. This rotation is performed around a rotation axis D that extends in the direction in which the breast 15 enters and exits the breast storage unit 3 (Z direction) through the inside of the breast storage unit 3. The radiation generating tube 8 and the radiation detector 11 are rotated in the same direction at the same angular velocity. When shooting in breast CT apparatus 1, from the surface side of the front plate 7 of the test person P gantry 2, from the breast inlet and outlet 17 to the breast receiving portion 3 by inserting the breast 15, a CT imaging while maintaining this posture Do. The mammo CT apparatus 1 of this example is of a type in which the front plate 7 is installed vertically and the subject P stands in front of the front plate 7 for examination. However, the mammo CT apparatus 1 according to the present invention is a type in which the front plate 7 is placed sideways and the front plate 7 is used as the top plate described in the background art, and the subject lies on the front plate 7 and is inspected. It can also be. In this case, the inner peripheral plate 5 can be omitted.

<放射線発生管>
図2及び図3に示されるように、放射線発生管8は、透過型放射線発生管であり、電子線を発生させる電子銃9と、放射線放出部10とを備えている。電子銃9としては、例えば熱フィラメントタイプの電子発生源を用いることができる。放射線放出部10は、放射線透過性の支持基板上に、電子銃9からの電子線の照射により放射線を発生させるターゲット層を積層した透過型ターゲットを備えている。支持基板を構成する材料は、ターゲット層を支持できる強度を有し、ターゲット層で発生した放射線の吸収が少なく、かつターゲット層で発生した熱をすばやく放熱できるよう熱伝導率の高いものが好ましい。例えばダイアモンド、炭化シリコン、窒化アルミニウム等を用いることができる。ターゲット層を構成する材料は、融点が高く、放射線発生効率の高いものが好ましく、例えばタングステン、タンタル、モリブデン及びそれらの合金等を用いることができる。
<Radiation tube>
As shown in FIGS. 2 and 3, the radiation generating tube 8 is a transmissive radiation generating tube, and includes an electron gun 9 that generates an electron beam and a radiation emitting unit 10. As the electron gun 9, for example, a hot filament type electron generation source can be used. The radiation emitting unit 10 includes a transmission type target in which a target layer that generates radiation by irradiating an electron beam from an electron gun 9 is laminated on a radiation transmissive support substrate. The material constituting the support substrate is preferably a material having a strength capable of supporting the target layer, a low absorption of radiation generated in the target layer, and a high thermal conductivity so that heat generated in the target layer can be quickly dissipated. For example, diamond, silicon carbide, aluminum nitride, or the like can be used. The material constituting the target layer is preferably a material having a high melting point and high radiation generation efficiency. For example, tungsten, tantalum, molybdenum and alloys thereof can be used.

放射線放出部10は、ターゲットへの電子線の照射により発生した放射線の放出領域を所定の放射線照射領域13に規定するためのコリメート機能を有している。放出された放射線は、このコリメート機能により所定の放射線照射領域13に規定されながら、放射線検出器11へ照射される。この時、被者Pの乳房15が放射線照射領域13に入ることで、乳房15の放射線透過像が放射線検出器11に到達し、乳房15の内部に含まれる乳腺、脂肪などの透過像が得られる。 The radiation emitting unit 10 has a collimating function for defining a radiation emission region generated by the electron beam irradiation to the target as a predetermined radiation irradiation region 13. The emitted radiation is irradiated to the radiation detector 11 while being defined in a predetermined radiation irradiation region 13 by this collimating function. At this time, since the breast 15 of the test person P enters the irradiation region 13, mammary gland radiation transmission image of the breast 15 reaches the radiation detector 11, contained within the breast 15, the transmitted image such as fat can get.

放射線発生管8は、回転駆動部101(図4参照)によって回転する不図示の回転板に支持されており、回転板の回転により、乳房収納部3への乳房15の入出方向に延びる回転軸Dの周りに回転するものとなっている。   The radiation generating tube 8 is supported by a rotating plate (not shown) that is rotated by a rotation driving unit 101 (see FIG. 4), and a rotating shaft that extends in the direction in which the breast 15 enters and exits the breast storage unit 3 by the rotation of the rotating plate. It rotates around D.

<放射線検出器>
放射線検出器11は、放射線を検出できる中央部の検出エリア11aと、放射線を検出できない周縁部の非検出エリア11bとを有している。本例の放射線検出11は、検出エリア11aには複数の放射線検出素子が配置されており、非検出エリア11bには複数の放射線検出素子に接続された信号配線が配設された構成となっている。本例における検出エリア11aは、放射線放出部10のコリメート機能により規定された放射線照射領域13と一致するサイズであり、本例での検出エリア11aの平面形状は四角形とした。放射線検出素子は、入射した方射線の強度を電気信号に変換される素子であれば特にその態様は限定されないが、CMOS等の光電変換素子と蛍光体とにより構成される。また放射線検出器11は、撮影システムとの親和性の観点から、さらに、AD変換器を備えたデジタルセンサ型の放射線検出器としてもよい。
<Radiation detector>
The radiation detector 11 has a central detection area 11a where radiation can be detected and a peripheral non-detection area 11b where radiation cannot be detected. The radiation detector 11 of this embodiment, the detection area 11a are arranged a plurality of radiation detecting elements, the non-detection area 11b is configured to signal wiring connected to a plurality of radiation detecting elements are arranged ing. The detection area 11a in this example has a size that matches the radiation irradiation region 13 defined by the collimating function of the radiation emitting unit 10, and the planar shape of the detection area 11a in this example is a quadrangle. The radiation detection element is not particularly limited as long as it is an element that converts the intensity of incident radiation to an electric signal, but is configured by a photoelectric conversion element such as a CMOS and a phosphor. Further, the radiation detector 11 may be a digital sensor type radiation detector provided with an AD converter from the viewpoint of compatibility with the imaging system.

放射線検出器11は、乳房収納部3を挟んで放射線発生管8の放射線放出部10と対向する位置に設けられている。また、放射線検出器11は、放射線発生管8と共に、回転駆動部101(図4参照)によって回転する不図示の回転板に支持されている。放射線検出器11は、回転板の回転により、乳房収納部3への乳房15の入出方向に延びる回転軸Dの周りに、放射線発生管8と同一角速度で同方向に回転するものとなっている。   The radiation detector 11 is provided at a position facing the radiation emitting portion 10 of the radiation generating tube 8 with the breast accommodating portion 3 interposed therebetween. The radiation detector 11 is supported by a rotating plate (not shown) that is rotated together with the radiation generating tube 8 by a rotation driving unit 101 (see FIG. 4). The radiation detector 11 rotates in the same direction at the same angular velocity as that of the radiation generating tube 8 around the rotation axis D extending in the direction in which the breast 15 enters and exits the breast housing 3 by the rotation of the rotating plate. .

<放射線遮蔽体>
図2及び図3に示されるように、ガントリ2の前面板7の内側には、乳房入出口17の周囲を囲んで、二重の環状の放射線遮蔽体14が設けられている。この放射線遮蔽体14は、内周縁側(乳房入出口17の側の周縁)の内周放射線遮蔽体14bと、外周縁側(外周板6の側の周縁)の外周放射線遮蔽体14aとに分かれており、両者間に環状の隙間14cを開けて設けられている。この隙間14cは、放射線検出器11の回転移動経路に対応して形成されており、放射線検出器11は上記間隔14cに対応する位置に設けられていて、放射線検出器11の前面板7と対向する側の端部は隙間14cの内側に入り込んでいる。換言すると、放射線検出器11の前面板7と対向する側の端部は、内周放射線遮蔽体14b及び外周放射線遮蔽体14aの表面より前面板7の側に入り込んでいる。放射線検出器11は、その前面板7と対向する側の端部が隙間14c内に入り込んだ状態で、回転軸Dの周りを回転移動するものとなっている。
<Radiation shield>
As shown in FIGS. 2 and 3, a double annular radiation shield 14 is provided inside the front plate 7 of the gantry 2 so as to surround the breast entrance / exit 17. The radiation shield 14 is divided into an inner peripheral radiation shield 14b on the inner peripheral side (a peripheral edge on the breast entrance / exit 17 side) and an outer peripheral radiation shield 14a on the outer peripheral side (the peripheral edge on the outer peripheral plate 6 side). It is provided with an annular gap 14c between them. The gap 14c is formed corresponding to the rotational movement path of the radiation detector 11, and the radiation detector 11 is provided at a position corresponding to the interval 14c and faces the front plate 7 of the radiation detector 11. The end on the side to be inserted enters the inside of the gap 14c. In other words, the end of the radiation detector 11 on the side facing the front plate 7 enters the front plate 7 side from the surfaces of the inner radiation shield 14b and the outer radiation shield 14a. The radiation detector 11 rotates around the rotation axis D in a state where the end on the side facing the front plate 7 enters the gap 14c.

外周放射線遮蔽体14aと内周放射線遮蔽体14bで構成された放射線遮蔽体14は、放射線放出部10から被者Pへの放射線の直接照射や、放射線検出器11に放射線が当たった時に生じる散乱放射線などの被者Pへの漏洩を防止するためのものである。放射線遮蔽体14の材質としては、放射線の遮蔽能力の高い鉛、タングステン、タンタル、レニウムなどの重金属が適している。また、放射線遮蔽体14(外周放射線遮蔽体14a及び内周放射線遮蔽体14b)は、一般的には円環状であるが、楕円環状、矩形環状などとすることもできる。 Radiation shield 14 made of an outer peripheral radiation shield 14a and the inner circumferential radiation shield 14b from the radiation-emitting portion 10 direct irradiation or radiation to the test person P, occurs when radiation strikes the radiation detector 11 scattered radiation is used to prevent leakage of the subject test person P such. As the material of the radiation shield 14, heavy metals such as lead, tungsten, tantalum, and rhenium having high radiation shielding ability are suitable. The radiation shield 14 (outer peripheral radiation shield 14a and inner peripheral radiation shield 14b) is generally annular, but may be elliptical, rectangular, or the like.

本例のような配置により、Z方向から見た時に、放射線検出器11の前面板7に対向する側の端部が放射線遮蔽体14の肉厚内に入り込んだ状態となる。このため、放射線遮蔽体14に邪魔されることなく、放射線検出器11をガントリ2の前面板7に近付けることができ、検出エリア11aを前面板7に近付けて、乳房15の付根部までの広い範囲のCT撮影が可能となる。また、上記のように、Z方向から見た時に、放射線検出器11の前面板7に対向する側の端部が放射線遮蔽体14の肉厚と重なっているので、放射線検出器11と放射線遮蔽体14との間からの放射線の漏れも抑制することができる。   With the arrangement as in this example, when viewed from the Z direction, the end of the radiation detector 11 on the side facing the front plate 7 enters the thickness of the radiation shield 14. For this reason, the radiation detector 11 can be brought close to the front plate 7 of the gantry 2 without being obstructed by the radiation shield 14, and the detection area 11 a can be brought close to the front plate 7 to widen the root of the breast 15. CT imaging of a range becomes possible. In addition, as described above, since the end of the radiation detector 11 facing the front plate 7 overlaps with the thickness of the radiation shield 14 when viewed from the Z direction, the radiation detector 11 and the radiation shield are overlapped. Leakage of radiation from between the body 14 can also be suppressed.

<マンモCT装置の撮影システム>
図4は、本発明のマンモCT装置の撮影システムの構成図である。
<Mammo CT system imaging system>
FIG. 4 is a configuration diagram of an imaging system of the mammo CT apparatus of the present invention.

システム制御装置100は、放射線発生管8とその駆動回路102を備えた放射線発生装置103と、放射線検出器11と、回転駆動部101を連携制御する。駆動回路102は、システム制御装置100の放射線管制御部108による制御の下に、放射線発生管8に各種の制御信号を出力する。システム制御装置100の回転駆動制御部107は、放射線発生管8などを支持する回転板の回転位置を検出するための位置検出センサー104からの位置情報に基づき、回転駆動部101に駆動制御信号を出力する。この駆動制御信号により回転駆動部101を所定量回転させながら、放射線発生装置103から放出される放射線の放出状態が制御される。放射線発生装置103から放出された放射線は、コリメータなどで部分的に遮蔽され、乳房15を透過して放射線検出器11で検出される。放射線検出器11は、検出した放射線を画像信号に変換して信号処理部105に出力する。信号処理部105は、システム制御装置100による制御の下に、画像信号に所定の信号処理を施して画像処理部106へ送る。システム制御装置100の中の画像処理部106は、各回転位置で撮影された画像情報からCT画像を形成し、これを画像記憶部109で記憶する。放射線発生管8と放射線検出器11を乳房15の周りを一回転させながら複数枚撮影して得たCT画像を画像合成部110で合成して立体画像を生成することで、表示部111で立体画像を表示させることができる。   The system control apparatus 100 controls the radiation generating apparatus 103 including the radiation generating tube 8 and its driving circuit 102, the radiation detector 11, and the rotation driving unit 101 in cooperation with each other. The drive circuit 102 outputs various control signals to the radiation generation tube 8 under the control of the radiation tube control unit 108 of the system control apparatus 100. The rotation drive control unit 107 of the system control apparatus 100 sends a drive control signal to the rotation drive unit 101 based on position information from the position detection sensor 104 for detecting the rotation position of the rotary plate that supports the radiation generating tube 8 and the like. Output. The emission state of radiation emitted from the radiation generator 103 is controlled while rotating the rotation drive unit 101 by a predetermined amount by this drive control signal. The radiation emitted from the radiation generator 103 is partially shielded by a collimator or the like, passes through the breast 15 and is detected by the radiation detector 11. The radiation detector 11 converts the detected radiation into an image signal and outputs it to the signal processing unit 105. The signal processing unit 105 performs predetermined signal processing on the image signal and sends the image signal to the image processing unit 106 under the control of the system control apparatus 100. The image processing unit 106 in the system control device 100 forms a CT image from image information captured at each rotational position, and stores this in the image storage unit 109. The display unit 111 generates a stereoscopic image by synthesizing a CT image obtained by capturing a plurality of images of the radiation generating tube 8 and the radiation detector 11 while rotating around the breast 15 by the image synthesis unit 110. An image can be displayed.

〔第2の例〕
図5は第2の例に係るマンモCT装置を示している。本例では、1枚の環状の放射線遮蔽体14が、前面板7の外周縁との間に隙間14cを開けて、前面板7の内面上に設けられている。放射線検出器11は、この隙間14cに対応する位置に設けられており、前面板7と対向する側の端部が、隙間14cの内側に入り込んでいる。つまり、放射線検出器11の前面板7と対向する側の端部が放射線遮蔽体14の表面より前面板7の側に入り込んでいる。これらの点以外は前述の第1の例と同様である。
[Second example]
FIG. 5 shows a mammo CT apparatus according to the second example. In the present example, one annular radiation shield 14 is provided on the inner surface of the front plate 7 with a gap 14 c between the outer peripheral edge of the front plate 7. The radiation detector 11 is provided at a position corresponding to the gap 14c, and the end on the side facing the front plate 7 enters the inside of the gap 14c. That is, the end of the radiation detector 11 on the side facing the front plate 7 enters the front plate 7 side from the surface of the radiation shield 14. Except for these points, the second example is the same as the first example.

以上のような構成とすることで、放射線照射領域13が実質的に隙間14cを横切らない構成とすることができるので、前述の第1の例よりも被者Pへの放射線の確実な漏洩防止を行なうことができる。 By the above configuration, since the irradiation region 13 can be configured to substantially traverse the gap 14c, reliable leakage of radiation to the test person P than the first example described above Prevention can be performed.

〔第3の例〕
図6に示されるように、本例の放射線検出器11は立体的に湾曲している形状となっている。具体的には、図6に示される回転軸Dの周りの回転方向に、回転外周側に凸に湾曲している。それ以外は前述の第1の例と同様である。
[Third example]
As shown in FIG. 6, the radiation detector 11 of this example has a three-dimensionally curved shape. Specifically, it is convexly curved toward the rotation outer periphery side in the rotation direction around the rotation axis D shown in FIG. The rest is the same as the first example described above.

このようにすることによって、外周放射線遮蔽体14aと内周放射線遮蔽体14bとの間に開けた隙間14cの幅を小さくすることができ、この領域からの放射線の漏洩を抑制することができる。この隙間14cの幅を最も狭くすることができることから、放射線検出器11の曲率中心が回転軸Dと一致していることが最も好ましい。   By doing in this way, the width | variety of the clearance gap 14c opened between the outer periphery radiation shield 14a and the inner periphery radiation shield 14b can be made small, and the leakage of the radiation from this area | region can be suppressed. Since the width of the gap 14c can be minimized, it is most preferable that the center of curvature of the radiation detector 11 coincides with the rotation axis D.

〔第4の例〕
図7に示されるように、本例は、前述した第2の例における放射線検出器11を、回転軸Dの周りの回転方向に、回転外周側に凸に湾曲させたものとなっている。それ以外は前述の第2の例と同様である。
[Fourth example]
As shown in FIG. 7, in this example, the radiation detector 11 in the second example described above is curved convexly toward the outer periphery of the rotation in the rotation direction around the rotation axis D. The rest is the same as the second example described above.

本例においては、前面板7の外周縁との間に開けた隙間14cの幅を小さくすることができ、この領域からの放射線の漏洩を抑制することができる。この隙間14cの幅を最も狭くすることができることから、放射線検出器11の曲率中心が回転軸Dと一致していることが最も好ましいのは第3の例と同様である。   In this example, the width of the gap 14c opened between the outer peripheral edge of the front plate 7 can be reduced, and radiation leakage from this region can be suppressed. Since the width of the gap 14c can be made the smallest, it is most preferable that the center of curvature of the radiation detector 11 coincides with the rotation axis D, as in the third example.

〔第5の例〕
図8に示されるように、放射線放出部10から乳房収納部3への放射線照射領域13と重なる隙間14cの領域を埋めて、回転軸Dの周りを放射線検出器11と同期して同方向に回転する放射線副遮蔽体16が設けられている。この点以外は前述の第1の例と同様である。
[Fifth example]
As shown in FIG. 8, the region of the gap 14c overlapping the radiation irradiation region 13 from the radiation emitting unit 10 to the breast storage unit 3 is filled, and the periphery of the rotation axis D is synchronized with the radiation detector 11 in the same direction. A rotating radiation sub-shield 16 is provided. Except this point, the second embodiment is the same as the first example.

このようにすることによって、特に放射線放出部10と乳房収納部3との間に位置する隙間14cからの放射線の漏洩を抑制することができる。放射線副遮蔽体16は、少なくとも放射線放出部10から乳房収納部3への放射線照射領域13と重なる隙間14cの領域に設けることが効果的で、更に広い領域に設けることで放射線の漏洩防止効果を向上させることもできる。   By doing in this way, the leakage of the radiation from especially the clearance gap 14c located between the radiation emission part 10 and the breast accommodating part 3 can be suppressed. It is effective to provide the radiation sub-shield 16 at least in the region of the gap 14c that overlaps the radiation irradiation region 13 from the radiation emitting unit 10 to the breast storage unit 3, and by providing it in a wider region, the effect of preventing radiation leakage is provided. It can also be improved.

1:マンモ断層撮影装置(マンモCT装置)、2:ガントリ、3:乳房収納部、4:支持部、5:内周板、6:外周板、7:前面板、8:放射線発生管、9:電子銃、10:放射線放出部、11:放射線検出器、11a:検出エリア、11b:被検出エリア、12:コリメータ、13:放射線照射領域、14:放射線遮蔽体、14a:外周放射線遮蔽体、14b:内周放射線遮蔽体、14c:隙間、15:乳房、16:放射線副遮蔽体、100:システム制御装置、101:回転駆動部、102:駆動回路、103:放射線発生装置、104:位置検出センサー、105:信号処理部、106:画像処理部、107:回転駆動制御部、108:放射線発生管制御部、109:画像記憶部、110:画像合成部、111:表示部、P:被検者、D:回転軸   1: mammography apparatus (mammography CT apparatus), 2: gantry, 3: breast housing part, 4: support part, 5: inner peripheral plate, 6: outer peripheral plate, 7: front plate, 8: radiation generating tube, 9 : Electron gun, 10: radiation emitting part, 11: radiation detector, 11a: detection area, 11b: detected area, 12: collimator, 13: radiation irradiation region, 14: radiation shield, 14a: outer peripheral radiation shield, 14b: inner peripheral radiation shield, 14c: gap, 15: breast, 16: radiation auxiliary shield, 100: system controller, 101: rotation drive unit, 102: drive circuit, 103: radiation generator, 104: position detection Sensor: 105: Signal processing unit 106: Image processing unit 107: Rotation drive control unit 108: Radiation generation tube control unit 109: Image storage unit 110: Image composition unit 111: Display unit P: Test Person, : Axis of rotation

Claims (14)

乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線遮蔽部は、前記前面板の内周側に位置する内周X線遮蔽部と、隙間を介して前記内周X線遮蔽部の外側に位置する外周X線遮蔽部とを有し、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする乳房断層撮影装置。
A gantry having a front plate provided with a breast insertion slot into which a breast is inserted, and a breast insertion section connected to the breast insertion slot;
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector, have a portion overlapping with the X-ray shielding section in a radial direction perpendicular to the rotating shaft,
The X-ray shielding part has an inner circumferential X-ray shielding part located on the inner circumferential side of the front plate, and an outer circumferential X-ray shielding part located outside the inner circumferential X-ray shielding part via a gap. In the gap, the X-ray detector overlaps with the X-ray shielding unit as viewed from the X-ray emission unit .
乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線遮蔽部の外周縁と前記前面板の外周縁との間に隙間が設けられ、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする乳房断層撮影装置。
A gantry having a front plate provided with a breast insertion slot into which a breast is inserted, and a breast insertion section connected to the breast insertion slot;
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
A gap is provided between the outer peripheral edge of the X-ray shielding part and the outer peripheral edge of the front plate, and the X-ray detector is connected to the X-ray shielding part in the gap as viewed from the X-ray emission part. Breast tufts tomograph it said overlap.
乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線放出部から見て、前記X線検出器が前記X線遮蔽部の手前に重なる部分を有することを特徴とする乳房断層撮影装置。
A gantry having a front plate provided with a breast insertion slot into which a breast is inserted, and a breast insertion section connected to the breast insertion slot;
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
When viewed from the X-ray emitting section, milk tufts tomograph you characterized by having a portion where the X-ray detector overlap in front of the X-ray shielding portion.
乳房が挿入される乳房挿入口が設けられた前面板と、前記乳房挿入口に連なる乳房挿入部と、を有するガントリと、
前記ガントリの内部に配置され、X線放出部を有するX線発生管と、
前記ガントリの内部に配置され、前記乳房挿入部を間において前記X線放出部と対向するX線検出器と、
前記乳房挿入部を通る回転軸の周りに、前記X線発生管及び前記X線検出器を同期させて回転させる回転駆動部と、を有し、
前記X線放出部から前記乳房挿入部を介して前記X線検出器へ向けてX線を照射する乳房断層撮影装置であって、
前記乳房挿入部の周囲を囲んで前記前面板に備えられた環状のX線遮蔽部を有し、
前記X線検出器が、前記回転軸に直交する径方向において前記X線遮蔽部と重なる部分を有し、
前記X線検出器は、前記径方向において外側に凸に湾曲し、前記X線検出器の曲率中心は、前記回転軸に重なって位置していることを特徴とする乳房断層撮影装置。
A gantry having a front plate provided with a breast insertion slot into which a breast is inserted, and a breast insertion section connected to the breast insertion slot;
An X-ray generating tube disposed inside the gantry and having an X-ray emitting portion;
An X-ray detector disposed inside the gantry and opposed to the X-ray emission part between the breast insertion part;
A rotation drive unit that rotates the X-ray generation tube and the X-ray detector synchronously around a rotation axis that passes through the breast insertion unit;
A breast tomography apparatus that irradiates X-rays from the X-ray emission part to the X-ray detector via the breast insertion part,
An annular X-ray shielding portion provided on the front plate surrounding the breast insertion portion;
The X-ray detector has a portion overlapping the X-ray shielding portion in a radial direction orthogonal to the rotation axis;
The X-ray detector is curved convexly outwardly in the radial direction, the center of curvature of the X-ray detector, it milk humor tomograph you characterized lying overlaps the rotation axis.
前記X線検出器は、複数のX線検出素子を有しX線を検出可能な検出エリアと、前記検出エリアの周縁に位置しX線が検出されない非検出エリアと、を有しており、前記X線検出器の前記X線遮蔽部と重なる部分は前記非検出エリアであることを特徴とする請求項1乃至4のいずれか1項に記載の乳房断層撮影装置。 The X-ray detector includes a detection area having a plurality of X-ray detection elements and capable of detecting X-rays, and a non-detection area where the X-rays are not detected and are located at the periphery of the detection area, breast tomography apparatus according to any one of claims 1 to 4 wherein the portion overlapping the X-ray shielding portions of the X-ray detector, characterized in that said non-detection area. 前記X線遮蔽部は、前記回転軸方向に厚さを有する肉厚部を有し、前記肉厚部において前記X線検出器と重なる部分を有することを特徴とする請求項1乃至5のいずれか1項に記載の乳房断層撮影装置。 The X-ray blocking portion includes the rotating shaft thick portion having a thickness in the direction, either of claims 1 to 5, characterized in that it has a portion overlapping with the X-ray detector in the thick portion or breast tomography apparatus according to item 1. 前記X線遮蔽部は、前記前面板の内周側に位置する内周X線遮蔽部と、隙間を介して前記内周X線遮蔽部の外側に位置する外周X線遮蔽部とを有し、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする請求項3または4に記載の乳房断層撮影装置。The X-ray shielding part has an inner circumferential X-ray shielding part located on the inner circumferential side of the front plate, and an outer circumferential X-ray shielding part located outside the inner circumferential X-ray shielding part via a gap. 5. The mammography apparatus according to claim 3, wherein the X-ray detector overlaps with the X-ray shielding unit when viewed from the X-ray emission unit in the gap. 前記X線放出部から前記乳房挿入部へのX線照射領域と接する前記隙間に位置し、前記回転軸の周りを前記X線検出器と同期して同方向に回転するX線副遮蔽部を有することを特徴とする請求項1または7に記載の乳房断層撮影装置。 An X-ray sub-shielding unit that is located in the gap in contact with the X-ray irradiation region from the X-ray emitting unit to the breast insertion unit and rotates in the same direction around the rotation axis in synchronization with the X-ray detector. breast tomography apparatus according to Motomeko 1 or 7 you, comprising. 前記X線副遮蔽部は、前記乳房挿入口を間において前記X線検出器と反対側に位置することを特徴とする請求項に記載の乳房断層撮影装置。 The breast tomography apparatus according to claim 8 , wherein the X-ray sub-shielding unit is located on the opposite side of the X-ray detector with the breast insertion opening interposed therebetween. 前記X線遮蔽部の外周縁と前記前面板の外周縁との間に隙間が設けられ、前記隙間内において、前記X線放出部から見て、前記X線検出器は前記X線遮蔽部と重なることを特徴とする請求項3または4に記載の乳房断層撮影装置。A gap is provided between the outer peripheral edge of the X-ray shielding part and the outer peripheral edge of the front plate, and the X-ray detector is connected to the X-ray shielding part in the gap as viewed from the X-ray emission part. The breast tomography apparatus according to claim 3, wherein the breast tomography apparatuses overlap. 前記X線放出部から見て、前記X線遮蔽部が前記X線検出器の手前に重なる部分を有することを特徴とする請求項1乃至のいずれか1項に記載の乳房断層撮影装置。 The mammography apparatus according to any one of claims 1 to 6 , wherein the X-ray shielding unit has a portion overlapping in front of the X-ray detector as viewed from the X-ray emission unit. 前記X線放出部から見て、前記X線検出器が前記X線遮蔽部の手前に重なる部分を有することを特徴とする請求項4に記載の乳房断層撮影装置。The breast tomography apparatus according to claim 4, wherein the X-ray detector has a portion overlapping in front of the X-ray shielding unit when viewed from the X-ray emission unit. 前記X線検出器は、前記前面板と対向する側の端部において前記X線遮蔽部と重なることを特徴とする請求項1乃至12のいずれか1項に記載の乳房断層撮影装置。 The X-ray detector, breast tomography apparatus according to any one of claims 1 to 12, characterized in that at the end of the front plate opposite to the side overlapping the X-ray shielding portion. 前記X線検出器は、前記径方向において外側に凸に湾曲していることを特徴とする請求項1乃至のいずれか1項に記載の乳房断層撮影装置。 The breast tomography apparatus according to any one of claims 1 to 3 , wherein the X-ray detector is convexly curved outward in the radial direction.
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