JP5353394B2 - X-ray imaging device - Google Patents
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- JP5353394B2 JP5353394B2 JP2009094725A JP2009094725A JP5353394B2 JP 5353394 B2 JP5353394 B2 JP 5353394B2 JP 2009094725 A JP2009094725 A JP 2009094725A JP 2009094725 A JP2009094725 A JP 2009094725A JP 5353394 B2 JP5353394 B2 JP 5353394B2
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- 238000003384 imaging method Methods 0.000 title claims description 82
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- QWHNJUXXYKPLQM-UHFFFAOYSA-N CC1(C)CCCC1 Chemical compound CC1(C)CCCC1 QWHNJUXXYKPLQM-UHFFFAOYSA-N 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
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Description
この発明は、Ｘ線管を有するＸ線照射部と、Ｘ線検出器を有する撮影台とを備え、被検者を通過したＸ線を検出することによりＸ線撮像を行うＸ線撮像装置に関する。 The present invention relates to an X-ray imaging apparatus that includes an X-ray irradiation unit having an X-ray tube and an imaging table having an X-ray detector, and performs X-ray imaging by detecting X-rays that have passed through a subject. .
このようなＸ線撮像装置においては、適切なＸ線の線量でＸ線撮像を実行するために、被検者の体厚に応じてＸ線管の管電圧や管電流時間積等の撮像条件を変更する必要がある。ここで、Ｘ線管を有するＸ線照射部とＸ線検出器を有する撮影台との距離は、一般的に、ポテンショメータ等により測定される。一方、被検者の体表面とＸ線管との距離は、従来、Ｘ線照射部に取り付けられたメジャーを利用して測定している。そして、それらの距離から、被検者の体厚を計算し、計算された体厚に応じてＸ線管の管電圧や管電流時間積等の撮像条件を変更していた。 In such an X-ray imaging apparatus, in order to perform X-ray imaging with an appropriate X-ray dose, imaging conditions such as the tube voltage of the X-ray tube and the tube current time product according to the body thickness of the subject. Need to be changed. Here, the distance between the X-ray irradiation unit having the X-ray tube and the imaging table having the X-ray detector is generally measured by a potentiometer or the like. On the other hand, the distance between the body surface of the subject and the X-ray tube is conventionally measured using a measure attached to the X-ray irradiation unit. Then, the body thickness of the subject is calculated from these distances, and the imaging conditions such as the tube voltage and tube current time product of the X-ray tube are changed according to the calculated body thickness.
しかしながら、Ｘ線照射部に取り付けられたメジャーを利用して被検者の体表面とＸ線管との距離を測定する場合には、操作者がメジャーを持ってＸ線照射部から被検者の位置まで移動しなければならず、作業が面倒である。 However, when measuring the distance between the body surface of the subject and the X-ray tube using a measure attached to the X-ray irradiation unit, the operator holds the measure from the X-ray irradiation unit to the subject. It is necessary to move to the position, and the work is troublesome.
このため、特許文献１に記載されたように、Ｘ線照射部に超音波センサを付設し、この超音波センサによる測定値に基づいて、被検者の体厚を測定するＸ線撮像装置も提案されている。さらに、超音波センサによる距離の測定誤差を防止するため、特許文献２に記載されたように、超音波センサにおける発信部と受信部のいずれか一方をＸ線管側に配置し、他方を被検者の体表面に配置することにより、被検者の体表面とＸ線管との距離を測定するＸ線装置も提案されている。 For this reason, as described in Patent Document 1, an X-ray imaging apparatus that attaches an ultrasonic sensor to the X-ray irradiation unit and measures the body thickness of the subject based on the measurement value by the ultrasonic sensor is also provided. Proposed. Furthermore, in order to prevent measurement errors in the distance due to the ultrasonic sensor, as described in Patent Document 2, either one of the transmitter and the receiver in the ultrasonic sensor is arranged on the X-ray tube side, and the other is covered. An X-ray apparatus has also been proposed that measures the distance between the body surface of the subject and the X-ray tube by being placed on the body surface of the examiner.
特許文献１に記載されたように、Ｘ線照射部に超音波センサを付設し、この超音波センサによる測定値に基づいて被検者の体厚を測定する場合には、被検者の体表面とＸ線管との距離の測定を自動化することができる。しかしながら、例えば、Ｘ線照射装置の付近に装置を操作する操作者がいた場合には、超音波センサは被検者とともに操作者をも検出することから、Ｘ線照射装置と操作者との距離を、誤って、Ｘ線照射装置と被検者との距離であると認識する可能性がある。また、被検者の付近に設置されたその他の部材を被検者と誤認する可能性もある。このような場合には、適正な撮像条件でＸ線撮像を実行することができないこととなる。 As described in Patent Document 1, when an ultrasonic sensor is attached to the X-ray irradiation unit and the body thickness of the subject is measured based on the measurement value by the ultrasonic sensor, the body of the subject Measurement of the distance between the surface and the X-ray tube can be automated. However, for example, when there is an operator who operates the apparatus in the vicinity of the X-ray irradiation apparatus, the ultrasonic sensor detects both the operator and the operator, so the distance between the X-ray irradiation apparatus and the operator. May be erroneously recognized as the distance between the X-ray irradiation apparatus and the subject. In addition, other members installed near the subject may be mistaken for the subject. In such a case, X-ray imaging cannot be executed under appropriate imaging conditions.
なお、特許文献２に記載されたように、超音波センサにおける発信部と受信部のいずれか一方をＸ線管側に配置し、他方を被検者の体表面に配置した場合には、このような誤動作が生ずることはないが、この場合には、メジャーを利用して被検者の体表面とＸ線管との距離を測定する場合と同様、操作者が発信部または受信部を持ってＸ線照射部から被検者の位置まで移動しなければならず、作業が面倒であることにかわりはない。 In addition, as described in Patent Document 2, when either one of the transmitter and the receiver in the ultrasonic sensor is arranged on the X-ray tube side and the other is arranged on the body surface of the subject, However, in this case, as in the case where the distance between the body surface of the subject and the X-ray tube is measured using a measure, the operator has a transmitter or a receiver. Therefore, it is necessary to move from the X-ray irradiation unit to the position of the subject, and the work is not troublesome.
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線照射部に付設した超音波センサを利用して被検者の体表面とＸ線管との距離を自動的に測定した場合においても、誤動作を生ずることなく正確に距離の測定を実行することができるＸ線撮像装置を提供することを目的とする。 This invention was made in order to solve the said subject, and when measuring the distance of a subject's body surface and an X-ray tube automatically using the ultrasonic sensor attached to the X-ray irradiation part However, an object of the present invention is to provide an X-ray imaging apparatus capable of accurately measuring a distance without causing a malfunction.
請求項１に記載の発明は、Ｘ線管を有するＸ線照射部と、Ｘ線検出器を有する撮影台とを備え、被検者を通過したＸ線を検出することによりＸ線撮像を行うＸ線撮像装置であって、超音波を発信する発信部と、前記発信部から発信され前記被検者で反射した超音波を受信する受信部とから構成され、前記Ｘ線照射部に付設された超音波センサと、前記Ｘ線照射部と前記撮影台との距離を利用して、前記超音波センサの受信部による受信信号のうち、前記被検者で反射した超音波を特定することにより、前記被検者と前記Ｘ線照射部との距離を測定する制御部とを備えたことを特徴とする。 The invention described in claim 1 includes an X-ray irradiation unit having an X-ray tube and an imaging table having an X-ray detector, and performs X-ray imaging by detecting X-rays that have passed through the subject. An X-ray imaging apparatus, comprising: a transmitter for transmitting ultrasonic waves; and a receiver for receiving ultrasonic waves transmitted from the transmitter and reflected by the subject, and attached to the X-ray irradiation unit By using the distance between the ultrasonic sensor and the X-ray irradiation unit and the imaging table, the ultrasonic wave reflected by the subject is identified among the reception signals by the reception unit of the ultrasonic sensor. And a control unit for measuring a distance between the subject and the X-ray irradiation unit.
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Ｘ線照射部と前記撮影台との距離を測定する距離測定手段を備え、前記制御部は、前記距離測定手段による距離の測定値を利用して、前記超音波センサの受信部による受信信号のうち、前記被検者で反射した超音波を特定することにより、前記被検者と前記Ｘ線照射部との距離を測定する。 According to a second aspect of the present invention, in the first aspect of the present invention, a distance measuring unit that measures a distance between the X-ray irradiation unit and the imaging table is provided, and the control unit is a distance measured by the distance measuring unit. By using the measured value , the ultrasonic wave reflected by the subject among the signals received by the receiving unit of the ultrasonic sensor is specified , and thereby the distance between the subject and the X-ray irradiation unit is determined. Measure .
請求項３に記載の発明は、請求項１または請求項２に記載の発明において、前記制御部は、前記超音波センサの受信部による受信信号のうち、前記Ｘ線照射部と前記撮影台との距離と最も近い距離に相当する受信信号を、前記被検者で反射した超音波の信号と認識する。 According to a third aspect of the present invention, in the first or second aspect of the present invention, the control unit includes the X-ray irradiating unit, the imaging table, and the like, out of signals received by the receiving unit of the ultrasonic sensor. The received signal corresponding to the distance closest to the distance is recognized as an ultrasonic signal reflected by the subject.
請求項１に記載の発明によれば、Ｘ線照射部と撮影台との距離と超音波センサの受信部による受信信号とを利用して被検者とＸ線照射部との距離を測定することから、Ｘ線照射部に付設した超音波センサを利用して被検者の体表面とＸ線管との距離を自動的に測定した場合においても、操作者を被検者等と認識する等の誤動作を生ずることなく、被検者とＸ線照射部との距離の測定を正確に実行することが可能となる。 According to the first aspect of the present invention, the distance between the subject and the X-ray irradiation unit is measured using the distance between the X-ray irradiation unit and the imaging table and the reception signal from the reception unit of the ultrasonic sensor. Therefore, even when the distance between the body surface of the subject and the X-ray tube is automatically measured using an ultrasonic sensor attached to the X-ray irradiation unit, the operator is recognized as the subject. Thus, it is possible to accurately measure the distance between the subject and the X-ray irradiation unit without causing a malfunction such as the above.
請求項２に記載の発明によれば、Ｘ線照射部と撮影台との距離を測定する距離測定手段による距離の測定値と、超音波センサの受信部による受信信号とを利用して被検者とＸ線照射部との距離を測定することから、Ｘ線照射部と撮影台との距離が変更された場合にも、被検者とＸ線照射部との距離の測定を正確に実行することが可能となる。 According to the second aspect of the present invention, the test is performed by using the distance measurement value by the distance measurement unit that measures the distance between the X-ray irradiation unit and the imaging table and the reception signal by the reception unit of the ultrasonic sensor. Because the distance between the person and the X-ray irradiation unit is measured , even when the distance between the X-ray irradiation unit and the imaging table is changed, the distance between the subject and the X-ray irradiation unit is accurately measured. It becomes possible to do.
請求項３に記載の発明によれば、超音波センサの受信部による受信信号のうち、Ｘ線照射部と撮影台との距離と最も近い距離に相当する受信信号を被検者で反射した超音波の信号と認識することから、撮影台の最も近くに配置される被検者の体表面の位置を正確に認識することが可能となる。 According to the third aspect of the present invention, the reception signal corresponding to the distance closest to the distance between the X-ray irradiation unit and the imaging table among the reception signals by the reception unit of the ultrasonic sensor is reflected by the subject. Since it is recognized as a sound wave signal, it is possible to accurately recognize the position of the body surface of the subject arranged closest to the imaging table.
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線撮像装置の概要図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an X-ray imaging apparatus according to the present invention.
このＸ線撮像装置は、撮影台１とＸ線照射部２とから構成される。この撮影台１は、被検者が立った状態で撮像を行う立位撮影台であり、基台１２に、昇降機構１３を介してＸ線検出器１１を支持した構成を有する。Ｘ線検出器１１としては、例えば、フラットパネルディテクタ（ＦＰＤ）やイメージインテンシファイア（Ｉ．Ｉ．）等を使用することができる。このＸ線検出器１１は、昇降機構１３の駆動により、被検者の身長等に応じて昇降する。 This X-ray imaging apparatus includes an imaging table 1 and an X-ray irradiation unit 2. The imaging table 1 is a standing imaging table that performs imaging in a state where a subject stands, and has a configuration in which an X-ray detector 11 is supported on a base 12 via an elevating mechanism 13. As the X-ray detector 11, for example, a flat panel detector (FPD), an image intensifier (II), or the like can be used. The X-ray detector 11 moves up and down according to the height of the subject by driving the lifting mechanism 13.
また、Ｘ線照射部２は、Ｘ線を放射するＸ線管２１を備える。このＸ線管２１は、移動機構２３を介して支持部２２に支持されている。このＸ線管２１は、移動機構２３により、図１において矢印で示すように、撮影台１におけるＸ線検出器１１との距離Ｄが変更可能となっている。この撮影台１におけるＸ線検出器１１とＸ線照射部２におけるＸ線管２１との距離Ｄは、ポテンショメータ２７により測定されている。また、Ｘ線管２１には、超音波センサ２４が付設されている。 The X-ray irradiation unit 2 includes an X-ray tube 21 that emits X-rays. The X-ray tube 21 is supported by the support portion 22 via the moving mechanism 23. This X-ray tube 21 can change the distance D with the X-ray detector 11 in the imaging stand 1 by the moving mechanism 23 as shown by an arrow in FIG. A distance D between the X-ray detector 11 in the imaging table 1 and the X-ray tube 21 in the X-ray irradiation unit 2 is measured by a potentiometer 27. An ultrasonic sensor 24 is attached to the X-ray tube 21.
図２は、この超音波センサ２４の検出動作を示す模式図である。 FIG. 2 is a schematic diagram showing the detection operation of the ultrasonic sensor 24.
この超音波センサ２４は、超音波を発信する発信部２５と、この発信部２５から発信され被検出物（図２においてはＸ線検出部１１）で反射した超音波を受信する受信部２６とを備える。この超音波センサ２４においては、発信部２５から発信された超音波は、図２に示すように、空気中を放射状に伝播し、被検出物等の物体の表面で反射して受信部２６に戻ってくる。このときの発信から受信までの時間と、空気中の超音波の伝播速度とから、被検出物と超音波センサとの距離を測定することが可能となる。 The ultrasonic sensor 24 includes a transmission unit 25 that transmits ultrasonic waves, and a reception unit 26 that receives ultrasonic waves transmitted from the transmission unit 25 and reflected by an object to be detected (X-ray detection unit 11 in FIG. 2). Is provided. In the ultrasonic sensor 24, the ultrasonic wave transmitted from the transmitting unit 25 propagates radially in the air and is reflected by the surface of an object such as an object to be detected to the receiving unit 26 as shown in FIG. Come back. The distance between the object to be detected and the ultrasonic sensor can be measured from the time from transmission to reception at this time and the propagation speed of the ultrasonic wave in the air.
図３は、上述したＸ線撮像装置の主要な電気的構成を示すブロック図である。 FIG. 3 is a block diagram showing a main electrical configuration of the above-described X-ray imaging apparatus.
このＸ線撮像装置は、装置の制御に必要な動作プログラムが格納されたＲＯＭ３１と、制御時にデータ等が一時的にストアされるＲＡＭ３２と、論理演算を実行するＣＰＵ３３とから成る制御部３０を備える。この制御部３０は、インターフェース３４を介して、Ｘ線検出器１１と接続されている。また、この制御部３０は、インターフェース３４を介して、Ｘ線管２１を制御するためのＸ線管制御部２８と接続されている。さらに、この制御部３０は、インターフェース３４を介して、ポテンショメータ２７および超音波センサ２４と接続されている。 The X-ray imaging apparatus includes a control unit 30 including a ROM 31 that stores an operation program necessary for controlling the apparatus, a RAM 32 that temporarily stores data and the like during control, and a CPU 33 that executes a logical operation. . The control unit 30 is connected to the X-ray detector 11 via the interface 34. The control unit 30 is connected to an X-ray tube control unit 28 for controlling the X-ray tube 21 via an interface 34. Further, the control unit 30 is connected to the potentiometer 27 and the ultrasonic sensor 24 via the interface 34.
このようなＸ線撮像装置において撮像を行うときには、撮像台１におけるＸ線検出器１１の前面に被検者が起立する。このとき、撮影台１におけるＸ線検出器１１とＸ線照射部２におけるＸ線管２１との距離Ｄは、ポテンショメータ２７により測定されており、制御部３０のＲＡＭ３２に記憶されている。また、被検者とＸ線照射部２におけるＸ線管２１との距離は、超音波センサ２４により測定される。そして、制御部３０は、Ｘ線検出器１１とＸ線管２１との距離Ｄと、被検者とＸ線管２１との距離とから、被検者の体厚を計算する。 When imaging is performed with such an X-ray imaging apparatus, the subject stands on the front surface of the X-ray detector 11 on the imaging platform 1. At this time, the distance D between the X-ray detector 11 in the imaging table 1 and the X-ray tube 21 in the X-ray irradiation unit 2 is measured by the potentiometer 27 and stored in the RAM 32 of the control unit 30. The distance between the subject and the X-ray tube 21 in the X-ray irradiation unit 2 is measured by the ultrasonic sensor 24. The control unit 30 calculates the body thickness of the subject from the distance D between the X-ray detector 11 and the X-ray tube 21 and the distance between the subject and the X-ray tube 21.
被検者の体厚と、そのときのＸ線管２１の管電圧や管電流時間積等の撮像条件との関係は、例えば、ＲＯＭ３１に記憶されている。制御部３０は、被検者の体厚に応じて撮像条件を読み出し、これを制御信号としてＸ線制御部２８に発信する。Ｘ線管制御部２８は、受信した制御信号に基づいて、Ｘ線管２１に指令を送り、Ｘ線管２１から被検者に向けてＸ線を照射させる。 The relationship between the body thickness of the subject and the imaging conditions such as the tube voltage and tube current time product of the X-ray tube 21 at that time is stored in the ROM 31, for example. The control unit 30 reads the imaging condition according to the body thickness of the subject and transmits it to the X-ray control unit 28 as a control signal. The X-ray tube control unit 28 sends a command to the X-ray tube 21 based on the received control signal, and irradiates the subject with the X-rays from the X-ray tube 21.
図４はＸ線撮像時の様子を示す平面概要図であり、図５はそのときの超音波センサ２４における受信部２６の受信信号を示す概要図である。なお、図５においては、縦軸は超音波の受信信号の強度を、また、横軸は時間を示している。 FIG. 4 is a schematic plan view showing a state during X-ray imaging, and FIG. 5 is a schematic diagram showing a reception signal of the receiving unit 26 in the ultrasonic sensor 24 at that time. In FIG. 5, the vertical axis represents the intensity of the ultrasonic reception signal, and the horizontal axis represents time.
上述したＸ線撮像装置においてＸ線撮像を行う場合には、図４に示すように、撮影台１におけるＸ線検出器１１の前面に被検者４が起立する。このときには、Ｘ線撮像装置を操作してＸ線撮像をおこなう操作者５も、例えば、Ｘ線照射部２付近で撮影準備を行っている。このため、図５に示すように、超音波センサ２４における受信部２６の受信信号Ｒには、操作者５の体表面で反射した反射波であるピーク信号Ｒ５と、被検者４の体表面で反射した反射波であるピーク信号Ｒ４とが生ずることになる。このように、受信信号Ｒに複数のピーク信号が生じた場合には、被検者４の体表面を認識することができない。 When X-ray imaging is performed in the above-described X-ray imaging apparatus, the subject 4 stands on the front surface of the X-ray detector 11 on the imaging table 1 as shown in FIG. At this time, the operator 5 who performs X-ray imaging by operating the X-ray imaging apparatus is also preparing for imaging in the vicinity of the X-ray irradiation unit 2, for example. Therefore, as shown in FIG. 5, the received signal R of the receiving unit 26 in the ultrasonic sensor 24 includes a peak signal R5 that is a reflected wave reflected on the body surface of the operator 5 and a body surface of the subject 4. As a result, a peak signal R4, which is a reflected wave reflected at, is generated. Thus, when a plurality of peak signals occur in the received signal R, the body surface of the subject 4 cannot be recognized.
このため、この発明に係るＸ線撮像装置においては、制御部３０が、予め制御部３０のＲＡＭ３２に記憶された撮影台１におけるＸ線検出器１１とＸ線撮像部２におけるＸ線管２１との距離Ｄと、受信部２６の反射波であるピーク信号により計算された被検出物と超音波センサ２４との距離とを比較する。より具体的には、図５に示すように、超音波センサ２４において発信部２５が超音波を発信してから、受信部２６が被検出物において反射した反射波によるピーク信号を受信するまでの時間と、超音波が予め記憶したＸ線検出器１１とＸ線管２１との距離Ｄの２倍の距離を伝播するのに要する時間とを比較する。そして、超音波が距離Ｄの２倍の距離を伝播するのに要する時間と最も近くなるピーク信号Ｒ４を、被検者４の体表面で反射した反射波の信号であると認識する。 For this reason, in the X-ray imaging apparatus according to the present invention, the control unit 30 includes the X-ray detector 11 in the imaging table 1 and the X-ray tube 21 in the X-ray imaging unit 2 stored in the RAM 32 of the control unit 30 in advance. And the distance between the object to be detected and the ultrasonic sensor 24 calculated from the peak signal that is the reflected wave of the receiving unit 26 is compared. More specifically, as shown in FIG. 5, from the time when the transmitting unit 25 transmits ultrasonic waves in the ultrasonic sensor 24 to the time when the receiving unit 26 receives a peak signal due to the reflected wave reflected by the object to be detected. The time is compared with the time required for the ultrasonic wave to propagate a distance twice the distance D between the X-ray detector 11 and the X-ray tube 21 stored in advance. Then, the peak signal R4 closest to the time required for the ultrasonic wave to propagate a distance twice as long as the distance D is recognized as a reflected wave signal reflected from the body surface of the subject 4.
このような構成を採用することにより、操作者５の体表面で反射した反射波を被検者４の体表面で反射した反射波と誤認することを防止することが可能となる。従って、Ｘ線照射部２に付設した超音波センサ２４を利用して被検者４の体表面とＸ線管２１との距離を自動的に測定した場合においても、操作者５を被検者４と認識する誤動作を生ずることはなく、被検者４とＸ線照射部２との距離の測定を正確に実行することが可能となる。 By adopting such a configuration, it is possible to prevent the reflected wave reflected on the body surface of the operator 5 from being mistaken as the reflected wave reflected on the body surface of the subject 4. Therefore, even when the distance between the body surface of the subject 4 and the X-ray tube 21 is automatically measured using the ultrasonic sensor 24 attached to the X-ray irradiation unit 2, the operator 5 is not subject to the subject. Therefore, the measurement of the distance between the subject 4 and the X-ray irradiation unit 2 can be performed accurately.
なお、上述した実施形態においては、一般的に撮影台１と被検者４とは最も近くに存在すると考えられることから、超音波センサ２４の受信部２６で受信した反射信号を示すピーク信号うち、Ｘ線照射部２におけるＸ線管２１と撮影台１におけるＸ線検出器１１との距離Ｄと最も近い距離に相当するピーク信号Ｒ４を、被検者４で反射した反射波であるピーク信号と認識している。しかしながら、この発明はこのような形態に限定されるものではない。 In the above-described embodiment, since the imaging table 1 and the subject 4 are generally considered to be closest to each other, the peak signal indicating the reflected signal received by the receiving unit 26 of the ultrasonic sensor 24 is included. The peak signal which is a reflected wave reflected by the subject 4 is a peak signal R4 corresponding to the distance D closest to the distance D between the X-ray tube 21 in the X-ray irradiation unit 2 and the X-ray detector 11 in the imaging table 1. We recognize that. However, the present invention is not limited to such a form.
例えば、被検者４は、撮影台１におけるＸ線検出器１１の前面に起立するとともに、一定の体厚を有することから、被検出物と超音波センサ２４との距離がＸ線管２１とＸ線検出器１１との距離Ｄよりも大きくなる場合を排除するとともに、検出物と超音波センサ２４との距離が、Ｘ線管２１とＸ線検出器１１との距離Ｄから予め想定した被検者４の体厚相当距離を減算した距離に最も近いピーク信号を被検者４で反射した反射波であるピーク信号と認識するようにしてもよい。 For example, since the subject 4 stands on the front surface of the X-ray detector 11 on the imaging table 1 and has a certain body thickness, the distance between the object to be detected and the ultrasonic sensor 24 is the same as that of the X-ray tube 21. While excluding the case where the distance D is greater than the distance D from the X-ray detector 11, the distance between the detected object and the ultrasonic sensor 24 is assumed from the distance D between the X-ray tube 21 and the X-ray detector 11. The peak signal closest to the distance obtained by subtracting the body thickness equivalent distance of the examiner 4 may be recognized as a peak signal that is a reflected wave reflected by the examinee 4.
また、上述した実施形態においては、撮影台１におけるＸ線検出器１１とＸ線撮像部２におけるＸ線管２１との距離Ｄや、被検出物と超音波センサ２４との距離を利用して、被検者４の体表面で反射した超音波を認識している。しかしながら、撮影台１側の距離の基準はＸ線検出器１１でなくてもよく、Ｘ線撮像部２側の距離の基準はＸ線管２１や超音波センサ２４でなくてもよい。撮影台１のいずれかの部位と、Ｘ線撮像部２のいずれかの部位と、それらの間の位置関係とから、最終的にＸ線検出器１１とＸ線管２１と被検者４と体表面との位置関係が認識されれば、どのような部分を基準としてもよい。 In the above-described embodiment, the distance D between the X-ray detector 11 in the imaging table 1 and the X-ray tube 21 in the X-ray imaging unit 2 and the distance between the object to be detected and the ultrasonic sensor 24 are used. The ultrasonic waves reflected on the body surface of the subject 4 are recognized. However, the distance reference on the imaging table 1 side may not be the X-ray detector 11, and the distance reference on the X-ray imaging unit 2 side may not be the X-ray tube 21 or the ultrasonic sensor 24. From any part of the imaging table 1, any part of the X-ray imaging unit 2, and the positional relationship between them, finally the X-ray detector 11, the X-ray tube 21, and the subject 4 Any portion may be used as a reference as long as the positional relationship with the body surface is recognized.
また、上述した実施形態においては、撮影台１とＸ線撮像部２との距離を変更可能とし、これらの距離Ｄをポテンショメータ２７で測定しているが、撮影台１とＸ線撮像部２とが固定されていてもよい。 In the above-described embodiment, the distance between the imaging table 1 and the X-ray imaging unit 2 can be changed, and the distance D is measured by the potentiometer 27. However, the imaging table 1 and the X-ray imaging unit 2 May be fixed.
さらに、上述した実施形態においては、撮影台１として立位撮影台を採用した場合について説明したが、臥位撮影台を利用したＸ線撮像装置にこの発明を適用してもよい。 Furthermore, in the above-described embodiment, the case where the standing imaging stand is adopted as the imaging stand 1 has been described. However, the present invention may be applied to an X-ray imaging apparatus using a supine imaging stand.
１ 撮影台
２ Ｘ線照射部
１１ Ｘ線検出器
１２ 基台
１３ 昇降機構
２１ Ｘ線管
２２ 支持部
２３ 移動機構
２４ 超音波センサ
２５ 発信部
２６ 受信部
２７ ポテンショメータ
２８ Ｘ線管制御部
３０ 制御部
３１ ＲＯＭ
３２ ＲＡＭ
３３ ＣＰＵ
DESCRIPTION OF SYMBOLS 1 Imaging stand 2 X-ray irradiation part 11 X-ray detector 12 Base 13 Lifting mechanism 21 X-ray tube 22 Support part 23 Movement mechanism 24 Ultrasonic sensor 25 Transmitter 26 Receiving part 27 Potentiometer 28 X-ray tube control part 30 Control part 31 ROM
32 RAM
33 CPU
Claims (3)
超音波を発信する発信部と、前記発信部から発信され前記被検者で反射した超音波を受信する受信部とから構成され、前記Ｘ線照射部に付設された超音波センサと、
前記Ｘ線照射部と前記撮影台との距離を利用して、前記超音波センサの受信部による受信信号のうち、前記被検者で反射した超音波を特定することにより、前記被検者と前記Ｘ線照射部との距離を測定する制御部と、
を備えたことを特徴とするＸ線撮像装置。 An X-ray imaging apparatus that includes an X-ray irradiation unit having an X-ray tube and an imaging table having an X-ray detector, and performs X-ray imaging by detecting X-rays passing through a subject,
An ultrasonic sensor that is configured by a transmitting unit that transmits ultrasonic waves and a receiving unit that receives ultrasonic waves transmitted from the transmitting unit and reflected by the subject, and attached to the X-ray irradiation unit;
By using the distance between the X-ray irradiation unit and the imaging table, by specifying the ultrasonic wave reflected by the subject among the reception signals by the receiving unit of the ultrasonic sensor, A control unit for measuring a distance from the X-ray irradiation unit;
An X-ray imaging apparatus comprising:
前記Ｘ線照射部と前記撮影台との距離を測定する距離測定手段を備え、
前記制御部は、前記距離測定手段による距離の測定値を利用して、前記超音波センサの受信部による受信信号のうち、前記被検者で反射した超音波を特定することにより、前記被検者と前記Ｘ線照射部との距離を測定するＸ線撮像装置。 The X-ray imaging apparatus according to claim 1,
A distance measuring means for measuring a distance between the X-ray irradiation unit and the imaging table;
The controller uses the measured value of distance by the distance measuring means, said one of the signal received by the receiving portion of the ultrasonic sensor, by identifying ultrasound reflected by the subject, said subject X-ray imaging apparatus for measuring a distance between a person and the X-ray irradiation unit.
前記制御部は、前記超音波センサの受信部による受信信号のうち、前記Ｘ線照射部と前記撮影台との距離と最も近い距離に相当する受信信号を、前記被検者で反射した超音波の信号と認識するＸ線撮像装置。 The X-ray imaging apparatus according to claim 1 or 2,
The control unit reflects the received signal corresponding to the distance closest to the distance between the X-ray irradiating unit and the imaging table among the received signals from the receiving unit of the ultrasonic sensor. X-ray imaging device that recognizes as a signal.
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