WO2018235319A1 - Dosimeter - Google Patents
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- WO2018235319A1 WO2018235319A1 PCT/JP2018/000294 JP2018000294W WO2018235319A1 WO 2018235319 A1 WO2018235319 A1 WO 2018235319A1 JP 2018000294 W JP2018000294 W JP 2018000294W WO 2018235319 A1 WO2018235319 A1 WO 2018235319A1
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- plate
- dosimeter
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- conductive portion
- electrode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/185—Measuring radiation intensity with ionisation chamber arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles
- H01J47/02—Ionisation chambers
Definitions
- the present invention relates to a dosimeter that measures an incident dose of radiation such as X-rays.
- Such a dosimeter is also called an area dosimeter or an ionization chamber or the like, and is attached to an X-ray imaging apparatus or the like to measure an incident dose to a subject.
- Patent Document 1 discloses a radiation monitor provided with an ionization chamber, an electrometer, and a controller.
- Patent Document 2 discloses an ionization chamber detector provided with a split electrode and a guard ring surrounding the entire array of the split electrode.
- FIG. 7 is a vertical cross-sectional view of a conventional three-layer dosimeter 18, and FIG. 8 is an enlarged vertical cross-sectional view around the end of the conventional three-layer dosimeter 18.
- the dosimeter 18 includes a rectangular first plate 31 in plan view in which the electrodes 41 are formed on both sides, and a pair of rectangular second plates 32 in plan view in which the electrode 42 is formed on one side. And in order to arrange the pair of second plate-like members 32 on both sides of the first plate-like member 31 in a state of being separated by a predetermined distance, a pair of rectangular (frame-like) And a spacer 33.
- the pair of second plate-like bodies 32 opposes the electrodes 41 formed on both sides of the first plate-like body 31 on both sides of the first plate-like body 31. In the state, they are disposed opposite to each other through the pair of spacers 33.
- Each of the electrodes 41 and 42 is made of ITO (Indium Tin Oxide / indium tin oxide).
- This ITO is a compound obtained by adding several% of tin oxide to indium oxide.
- the first plate-like body 31 A conductive portion 47 is attached to the entire outer peripheral portion so as to cover an end portion of the first plate-like body 31 in a cross-sectional view.
- the electrode 41 formed on the surface of the first plate-like body 31 is a center which is a region separated by a predetermined distance from the edge of the rectangular first plate-like body 31 in order to avoid contact with the conductive portion 47. It is formed only in the area.
- the thin film of ITO When any member comes in contact with the surface on which the thin film of ITO is formed as an electrode, the thin film of ITO is damaged. In addition, when dirt or the like adheres to the thin film of ITO, the performance as a dosimeter deteriorates. For this reason, in the conventional dosimeter shown in FIGS. 7 and 8, the outer periphery of the first plate 31 can not be in contact with the electrodes 41 formed on both sides of the first plate 31 at the time of assembly. The work of attaching the conductive part to the end part so as to cover the end of the first plate-like body 31 can only be performed by a skilled assembly worker, and further, it takes a long time to assemble. there were.
- the conductive portion 47 when the conductive portion 47 is attached to the first plate-like body 31, if the end of the conductive portion 47 is present in the region inside the spacer 33, detection of the X-ray dose is disturbed. Therefore, it is necessary to position the conductive portion 47 with high accuracy, which also requires skill and long working time.
- the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a dosimeter capable of preventing leakage current and blocking noise by an extremely simple manufacturing process.
- the invention according to claim 1 comprises a first plate-like body having electrodes formed on both sides, and a pair of second plate-like bodies having electrodes formed on one side, and the pair of second plate-like bodies
- the first plate-like body and the pair of second plate-like bodies in a state where the electrodes of the pair of second plate-like bodies face the electrodes of the first plate-like body on both sides of the first plate-like body
- a cross section from the outer peripheral surface of the spacers to the surface facing the first plate-like body Forms the L-shaped first conductive portion and connects the conductive portions of the pair of spacers, and covers the edge of the first plate-like member over the entire periphery of the first plate-like member To form.
- an electrode is formed on the entire surface of both surfaces of the first plate-like body, and an electrode in the first plate-like body;
- An insulating layer is formed between the first conductive portion.
- the invention according to claim 3 is the invention according to claim 1 or 2, wherein the first plate-like body and the second plate-like body have translucency.
- the first conductive portion and the second conductive portion for preventing the leak current and blocking the noise for the spacer for preventing the leak current and blocking the noise Therefore, it is not necessary to consider the contact to the electrode, and the dosimeter can be easily manufactured. Then, the first conductive portion can be easily positioned with high accuracy.
- the electrodes can be formed over the entire area of both surfaces of the first plate-like body, so that the film formation of the electrode on the first plate-like body can be facilitated. It will be possible to do.
- the first and second plate members are made of light transmitting members, light such as a collimator lamp can be transmitted.
- FIG. 1 is a schematic side view of a mobile X-ray inspection apparatus to which a dosimeter according to the present invention is applied.
- 1 is a perspective view of a mobile X-ray inspection apparatus to which a dosimeter according to the present invention is applied.
- It is a longitudinal cross-sectional view of the dosimeter 18 which concerns on 1st Embodiment of this invention.
- It is an enlarged longitudinal cross-sectional view of end part vicinity of the dosimeter 18 which concerns on 1st Embodiment of this invention.
- It is a top view of dosimeter 18 concerning a 1st embodiment of this invention.
- It is an expansion longitudinal cross-sectional view of end part vicinity of the dosimeter 18 which concerns on 2nd Embodiment of this invention.
- It is a longitudinal cross-sectional view of the conventional three-layered dosimeter 18.
- It is an expansion longitudinal cross-sectional view of the edge part vicinity of the conventional three-layer structure dosimeter 18.
- FIG. 1 is a schematic side view of a mobile X-ray inspection apparatus to which a dosimeter 18 according to the present invention is applied.
- FIG. 2 is a perspective view of a mobile X-ray inspection apparatus to which the dosimeter 18 according to the present invention is applied.
- the mobile X-ray examination apparatus is also referred to as a round-table X-ray imaging apparatus, and moves between a plurality of patient rooms to execute an X-ray examination in each of the patient's rooms.
- the mobile X-ray inspection apparatus includes a support 14 provided on the carriage 15, an arm 13 provided to be able to move up and down with respect to the support 14, and an X-ray provided at the tip of the arm 13.
- a flat panel detector 16 as an X-ray detector for detecting an X-ray emitted from the tube 11 and passed through a subject, and a storage unit 17 for storing the flat panel detector 16 are provided.
- the mobile X-ray inspection apparatus further includes a display / operation unit 25 configured of a display unit of a digital image detected by the flat panel detector 16 and a touch panel LCD which functions as an input unit for inputting various operations.
- a display / operation unit 25 configured of a display unit of a digital image detected by the flat panel detector 16 and a touch panel LCD which functions as an input unit for inputting various operations.
- this mobile X-ray inspection apparatus is operated to operate the traveling direction of the carriage 15 and the pair of left and right front wheels 21 which are wheels for changing the direction, the pair of left and right rear wheels 22 which are wheels for driving.
- a handle 19 The rear wheel 22 is rotated by the drive of a motor disposed in the carriage 15.
- the arm 13 moves up and down between a fixed position where the arm 13 is to be disposed when moving the carriage 15 shown by a solid line in FIG. 1 and a photographing position elevated from the fixed position shown by an imaginary line in FIG. It is possible. Further, as shown in FIG. 2, the arm 13 pivots about the support 14 in a state of being lifted from the fixed position.
- the X-ray tube 11 and the flat panel detector 16 are disposed to face each other via the subject. Then, X-rays emitted from the X-ray tube 11 and whose X-ray irradiation field is limited by the collimator 12 are irradiated to the subject. The X-rays passing through the subject are detected by the flat panel detector 16. The X-ray dose exposed to the subject at the time of this X-ray imaging is measured by the dosimeter 18 according to the present invention.
- FIG. 3 is a longitudinal sectional view of the dosimeter 18 according to the first embodiment of the present invention.
- FIG. 4 is an enlarged vertical sectional view of the vicinity of the end of the dosimeter 18 according to the first embodiment of the present invention.
- FIG. 5 is a plan view of the dosimeter 18 according to the first embodiment of the present invention.
- the dosimeter 18 includes a rectangular first plate 31 in plan view in which the electrodes 41 are formed on both sides, and a pair of rectangular second plates 32 in plan view in which the electrode 42 is formed on one side. And in order to arrange the pair of second plate-like members 32 on both sides of the first plate-like member 31 in a state of being separated by a predetermined distance, a pair of rectangular (frame-like) And a spacer 33.
- the pair of second plate-like bodies 32 opposes the electrodes 41 formed on both sides of the first plate-like body 31 on both sides of the first plate-like body 31. In the state, they are disposed opposite to each other through the pair of spacers 33.
- an inert gas such as argon or nitrogen or a gas such as air is enclosed.
- the first plate-like body 31 and the second plate-like body 32 are made of a translucent resin such as polycarbonate or acrylic.
- the electrodes 41 and 42 formed on the first plate-like body 31 and the second plate-like body 32 are made of ITO.
- the spacer 33 is made of resin such as ABS.
- each of the pair of spacers 33 has an L-shaped cross section from the outer peripheral surface of each spacer 33 to the surface facing the electrode 41 formed on the surface of the first plate-like member 31.
- a conductive portion 43 is formed.
- the electrode 41 is formed in the 1st plate-shaped body 31 over the whole area
- an insulating layer 49 for insulating between the first conductive portion 43 and the electrode 41 is provided between the first conductive portion 43 and the electrode 41.
- the insulating layer 49 is made of, for example, an insulating double-sided adhesive tape, and bonds the first conductive portion 43 and the electrode 41 to each other.
- the pair of first conductive portions 43 formed on the spacers 33 are connected between the pair of spacers 33, and the edge of the first plate-like member 31 is the entire surface of the first plate-like member 31.
- a second conductive portion 44 which covers the circumference is formed.
- the first conductive portion 43 and the second conductive portion 44 are made of a conductive foil such as copper or aluminum.
- the first conductive portion 43 and the second conductive portion 44 block the leakage current flowing through the surface of the pair of spacers 33 and the like so as not to flow into the electrode 41 of the first plate-like body 31, and from the outside Have a function of shielding noise.
- the dosimeter 18 having the above configuration, as in the conventional dosimeter 18 shown in FIGS. 7 and 8, it is necessary to bond the conductive portion 47 to the first plate-like body 31 on which the electrode 41 is formed. There is no need to consider the contact to the electrode 41, and the dosimeter 18 can be easily manufactured. Further, the first conductive portion 43 is attached to the spacer 33, and then the first plate-like body 31 and the pair of second plate-like bodies 32 are attached to the spacer 33 to constitute the dosimeter 18 It is possible to easily position the first conductive portion 43 with high accuracy. Further, unlike the conventional dosimeter 18 shown in FIGS. 7 and 8, the electrode 41 can be formed over the entire area of both surfaces of the first plate-like body 31 by utilizing the insulating function of the insulating layer 49. It becomes possible to easily perform the film formation of the electrode 41 on the first plate-like body 31.
- FIG. 6 is an enlarged vertical cross-sectional view of the vicinity of the end of the dosimeter 18 according to the second embodiment of the present invention.
- symbol is attached
- the insulating layer 49 used in the dosimeter 18 according to the first embodiment is omitted.
- the electrode 41 formed on the surface of the first plate-like body 31 has a rectangular first shape. It is formed only in the central area which is an area separated from the edge of the plate-like body 31 by a predetermined distance.
- the electrode 41 is not required to be formed in the vicinity of the end edge of both surfaces of the first plate-like body 31. Although the film forming process of the electrode 41 is complicated, it is possible to obtain the same function and effect as the dosimeter 18 according to the first embodiment without using the insulating layer 49.
- Reference Signs List 11 X-ray tube 12 collimator 16 flat panel detector 18 dosimeter 31 first plate-like body 32 second plate-like body 33 spacer 41 electrode 42 electrode 43 first conductive portion 44 second conductive portion 49 insulating layer
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Abstract
In the present invention, on each of a pair of spacers (33), a first conductive part (43) is formed that has an L-shaped cross section and extends from the outer peripheral surface of the spacer (33) to the surface of the spacer (33) opposing an electrode (41) formed on the surface of a first plate-like body (31). Electrodes (41) are formed over the entire area of both sides of the first plate-like body (31). Insulating layers (49) for insulating the first conductive parts (43) and electrodes (41) are provided between the first conductive parts (43) and electrodes (41). A second conductive part (44) is formed so as to bridge between the pair of spacers (43), which connects the pair of first conductive parts (43) formed on the spacers (43) and covers the end edge of the first plate-like body (31) across the entire periphery of the first plate-like body (31).
Description
この発明は、Ｘ線等の放射線の入射線量を測定する線量計に関する。
The present invention relates to a dosimeter that measures an incident dose of radiation such as X-rays.
このような線量計は、面積線量計、あるいは、電離箱等とも呼称されるものであり、被検者に対する入射線量を測定するためにＸ線撮影装置等に付設されるものである。
Such a dosimeter is also called an area dosimeter or an ionization chamber or the like, and is attached to an X-ray imaging apparatus or the like to measure an incident dose to a subject.
特許文献１には、電離箱と、電位計と、コントローラとを備えた放射線モニターが開示されている。特許文献２には、分割電極と、この分割電極のアレイ全体を囲むガードリングとを備えた電離箱検出器が開示されている。
Patent Document 1 discloses a radiation monitor provided with an ionization chamber, an electrometer, and a controller. Patent Document 2 discloses an ionization chamber detector provided with a split electrode and a guard ring surrounding the entire array of the split electrode.
図７は、従来の三層構造の線量計１８の縦断面図であり、図８は、従来の三層構造の線量計１８の端部付近の拡大縦断面図である。
FIG. 7 is a vertical cross-sectional view of a conventional three-layer dosimeter 18, and FIG. 8 is an enlarged vertical cross-sectional view around the end of the conventional three-layer dosimeter 18.
この線量計１８は、両面に電極４１が形成された平面視において矩形状の第１板状体３１と、片面に電極４２が形成された平面視において矩形状の一対の第２板状体３２と、第１板状体３１の両側に一対の第２板状体３２を所定距離だけ離隔した状態で配置するために、平面視において中央に開口部を有する矩形状（枠状）の一対のスペーサ３３とを備える。一対の第２板状体３２は、第１板状体３１の両側に、一対の第２板状体３２の電極４２が、第１板状体３１の両面に形成された電極４１と対向する状態で、一対のスペーサ３３を介して対向配置されている。
The dosimeter 18 includes a rectangular first plate 31 in plan view in which the electrodes 41 are formed on both sides, and a pair of rectangular second plates 32 in plan view in which the electrode 42 is formed on one side. And in order to arrange the pair of second plate-like members 32 on both sides of the first plate-like member 31 in a state of being separated by a predetermined distance, a pair of rectangular (frame-like) And a spacer 33. The pair of second plate-like bodies 32 opposes the electrodes 41 formed on both sides of the first plate-like body 31 on both sides of the first plate-like body 31. In the state, they are disposed opposite to each other through the pair of spacers 33.
なお、各電極４１、４２は、ＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘｉｄｅ／酸化インジウムスズ）から構成されている。このＩＴＯは、酸化インジウムに数％の酸化スズを添加した化合物である。
Each of the electrodes 41 and 42 is made of ITO (Indium Tin Oxide / indium tin oxide). This ITO is a compound obtained by adding several% of tin oxide to indium oxide.
第１板状体３１には、一対のスペーサ３３の表面等を通って流れるリーク電流が第１板状体３１に流れ込まないように遮断し、また、外部からのノイズを遮蔽するために、その外周部の全域に、断面視において第１板状体３１の端部を覆うように導電部４７が貼着されている。第１板状体３１の表面に形成された電極４１は、この導電部４７との接触を避けるため、矩形状の第１板状体３１の端縁から所定距離だけ離隔した領域である、中央領域にのみ形成されている。
In order to prevent leakage current flowing through the surfaces of the pair of spacers 33 from flowing into the first plate-like body 31 and to shield noise from the outside, the first plate-like body 31 A conductive portion 47 is attached to the entire outer peripheral portion so as to cover an end portion of the first plate-like body 31 in a cross-sectional view. The electrode 41 formed on the surface of the first plate-like body 31 is a center which is a region separated by a predetermined distance from the edge of the rectangular first plate-like body 31 in order to avoid contact with the conductive portion 47. It is formed only in the area.
なお、線量計１８を第１の板状体３１と一対の第２の板状体３２とから構成される三層構造とすることにより、Ｘ線の検出感度を向上させることが可能となる。
In addition, it becomes possible to improve the detection sensitivity of X-ray by making the dosimeter 18 into a three-layer structure comprised from the 1st plate-shaped body 31 and a pair of 2nd plate-shaped body 32. FIG.
電極としてＩＴＯの薄膜が形成された面に何らかの部材が接触すると、ＩＴＯの薄膜が損傷する。また、ＩＴＯの薄膜に汚れ等が付着した場合には、線量計としての性能が悪化する。このため、図７および図８に示す従来の線量計においては、組立時に第１板状体３１の両面に形成された電極４１と接触することができないことから、第１板状体３１の外周部に導電部を第１板状体３１の端部を覆うように貼着する作業は、熟練された組立作業者でないと実行することができず、さらに、組立に長い時間を要するという問題があった。また、導電部４７を第１板状体３１に貼着するときに、導電部４７の端部がスペーサ３３より内側領域に存在すると、Ｘ線量の検出に支障をきたす。このため、導電部４７を精度よく位置決めする必要があり、これにも熟練と長い作業時間が必要であった。
When any member comes in contact with the surface on which the thin film of ITO is formed as an electrode, the thin film of ITO is damaged. In addition, when dirt or the like adheres to the thin film of ITO, the performance as a dosimeter deteriorates. For this reason, in the conventional dosimeter shown in FIGS. 7 and 8, the outer periphery of the first plate 31 can not be in contact with the electrodes 41 formed on both sides of the first plate 31 at the time of assembly. The work of attaching the conductive part to the end part so as to cover the end of the first plate-like body 31 can only be performed by a skilled assembly worker, and further, it takes a long time to assemble. there were. In addition, when the conductive portion 47 is attached to the first plate-like body 31, if the end of the conductive portion 47 is present in the region inside the spacer 33, detection of the X-ray dose is disturbed. Therefore, it is necessary to position the conductive portion 47 with high accuracy, which also requires skill and long working time.
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、極めて簡単な製造工程により、リーク電流の防止とノイズの遮断とを行うことが可能な線量計を提供することを目的とする。
The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a dosimeter capable of preventing leakage current and blocking noise by an extremely simple manufacturing process.
請求項１に記載の発明は、両面に電極が形成された第１板状体と、片面に電極が形成された一対の第２板状体とを備え、前記一対の第２板状体を、前記第１板状体の両側に、前記一対の第２板状体の電極が前記第１板状体の電極と対向する状態で、前記第１板状体および前記一対の第２板状体の外形に相当する矩形状を有する一対のスペーサを介して対向配置した線量計において、前記一対のスペーサの各々に、当該スペーサにおける外周面から前記第１板状体と対向する面に至る断面がＬ字状の第１導電部を形成するとともに、前記一対のスペーサの導電部を接続し、前記第１板状体の端縁を前記第１板状体の全周にわたって覆う第２導電部を形成することを特徴とする。
The invention according to claim 1 comprises a first plate-like body having electrodes formed on both sides, and a pair of second plate-like bodies having electrodes formed on one side, and the pair of second plate-like bodies The first plate-like body and the pair of second plate-like bodies in a state where the electrodes of the pair of second plate-like bodies face the electrodes of the first plate-like body on both sides of the first plate-like body In the dosimeter disposed opposite to each other via a pair of spacers having a rectangular shape corresponding to the outer shape of the body, a cross section from the outer peripheral surface of the spacers to the surface facing the first plate-like body Forms the L-shaped first conductive portion and connects the conductive portions of the pair of spacers, and covers the edge of the first plate-like member over the entire periphery of the first plate-like member To form.
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１板状体には、その両面の全域にわたって電極が形成されるとともに、前記第１板状体における電極と、前記第１導電部との間には、絶縁層が形成される。
In the invention according to claim 2, in the invention according to claim 1, an electrode is formed on the entire surface of both surfaces of the first plate-like body, and an electrode in the first plate-like body; An insulating layer is formed between the first conductive portion.
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、前記第１板状体および前記第２板状体は、透光性を有する。
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the first plate-like body and the second plate-like body have translucency.
請求項１に記載の発明によれば、リーク電流の防止とノイズの遮断とを行うためのスペーサに対してリーク電流の防止とノイズの遮断とを行うための第１導電部と第２導電部を形成することから、電極への接触を考慮する必要はなく、容易に線量計を制作することができる。そして、第１導電部を容易に精度よく位置決めすることが可能となる。
According to the first aspect of the present invention, the first conductive portion and the second conductive portion for preventing the leak current and blocking the noise for the spacer for preventing the leak current and blocking the noise Therefore, it is not necessary to consider the contact to the electrode, and the dosimeter can be easily manufactured. Then, the first conductive portion can be easily positioned with high accuracy.
請求項２に記載の発明によれば、絶縁層を設けることにより、第１板状体の両面の全域にわたって電極を形成することができることから、第１板状体に対する電極の成膜を容易に行うことが可能となる。
According to the second aspect of the invention, by providing the insulating layer, the electrodes can be formed over the entire area of both surfaces of the first plate-like body, so that the film formation of the electrode on the first plate-like body can be facilitated. It will be possible to do.
請求項３に記載の発明によれば、第１板状体および第２板状体を、透光性を有する部材で構成したことから、コリメータランプ等の光を透過させることが可能となる。
According to the third aspect of the present invention, since the first and second plate members are made of light transmitting members, light such as a collimator lamp can be transmitted.
以下、この発明の実施の形態を図面に基づいて説明する。最初に、この発明に係る線量計１８を適用するＸ線撮影装置の構成について説明する。図１は、この発明に係る線量計１８を適用する移動型Ｘ線検査装置の側面概要図である。また、図２は、この発明に係る線量計１８を適用する移動型Ｘ線検査装置の斜視図である。
Hereinafter, embodiments of the present invention will be described based on the drawings. First, the configuration of an X-ray imaging apparatus to which the dosimeter 18 according to the present invention is applied will be described. FIG. 1 is a schematic side view of a mobile X-ray inspection apparatus to which a dosimeter 18 according to the present invention is applied. FIG. 2 is a perspective view of a mobile X-ray inspection apparatus to which the dosimeter 18 according to the present invention is applied.
この移動型Ｘ線検査装置は、回診用Ｘ線撮影装置とも呼称されるものであり、複数の病室間を移動して、各病室においてＸ線検査を実行するものである。この移動型Ｘ線検査装置は、台車１５に配設された支柱１４と、この支柱１４に対して昇降可能な状態で配設されたアーム１３と、アーム１３の先端に配設されたＸ線管１１と、このＸ線管１１の下方に配設されたコリメータ１２と、このコリメータ１２の下方に配設されたこの発明に係る線量計１８と、コリメータ１２に付設されたハンドル２６と、Ｘ線管１１から照射され被検者を通過したＸ線を検出するためのＸ線検出器としてのフラットパネルディテクタ１６と、このフラットパネルディテクタ１６を収納するための収納部１７とを備える。
The mobile X-ray examination apparatus is also referred to as a round-table X-ray imaging apparatus, and moves between a plurality of patient rooms to execute an X-ray examination in each of the patient's rooms. The mobile X-ray inspection apparatus includes a support 14 provided on the carriage 15, an arm 13 provided to be able to move up and down with respect to the support 14, and an X-ray provided at the tip of the arm 13. A tube 11, a collimator 12 disposed below the X-ray tube 11, a dosimeter 18 according to the present invention disposed below the collimator 12, a handle 26 attached to the collimator 12, X A flat panel detector 16 as an X-ray detector for detecting an X-ray emitted from the tube 11 and passed through a subject, and a storage unit 17 for storing the flat panel detector 16 are provided.
また、この移動型Ｘ線検査装置は、フラットパネルディテクタ１６により検出されたデジタル画像の表示部および各種の操作を入力する入力部として機能するタッチパネル式のＬＣＤから構成される表示・操作部２５を備える。さらに、この移動型Ｘ線検査装置は、方向変更用の車輪である左右一対の前輪２１と、駆動用の車輪である左右一対の後輪２２と、台車１５の進行方向を操作するための操作ハンドル１９とを備える。後輪２２は、台車１５内に配設されたモータの駆動により回転する。
The mobile X-ray inspection apparatus further includes a display / operation unit 25 configured of a display unit of a digital image detected by the flat panel detector 16 and a touch panel LCD which functions as an input unit for inputting various operations. Prepare. Furthermore, this mobile X-ray inspection apparatus is operated to operate the traveling direction of the carriage 15 and the pair of left and right front wheels 21 which are wheels for changing the direction, the pair of left and right rear wheels 22 which are wheels for driving. And a handle 19. The rear wheel 22 is rotated by the drive of a motor disposed in the carriage 15.
アーム１３は、図１において実線で示す、台車１５を移動させるときにアーム１３を配置すべき位置である固定位置と、図１において仮想線で示す固定位置から上昇した撮影位置との間を昇降可能となっている。また、アーム１３は、図２に示すように、固定位置から上昇した状態で、支柱１４を中心に旋回する。
The arm 13 moves up and down between a fixed position where the arm 13 is to be disposed when moving the carriage 15 shown by a solid line in FIG. 1 and a photographing position elevated from the fixed position shown by an imaginary line in FIG. It is possible. Further, as shown in FIG. 2, the arm 13 pivots about the support 14 in a state of being lifted from the fixed position.
このＸ線撮影装置によりＸ線撮影を実行するときには、Ｘ線管１１とフラットパネルディテクタ１６とを、被検者を介して対向配置させる。そして、Ｘ線管１１から照射され、コリメータ１２によりＸ線照射野を制限されたＸ線が被検者に照射される。被検者を通過したＸ線はフラットパネルディテクタ１６により検出される。このＸ線撮影時において被検者に曝射されたＸ線量は、この発明に係る線量計１８により測定される。
When X-ray imaging is performed by the X-ray imaging apparatus, the X-ray tube 11 and the flat panel detector 16 are disposed to face each other via the subject. Then, X-rays emitted from the X-ray tube 11 and whose X-ray irradiation field is limited by the collimator 12 are irradiated to the subject. The X-rays passing through the subject are detected by the flat panel detector 16. The X-ray dose exposed to the subject at the time of this X-ray imaging is measured by the dosimeter 18 according to the present invention.
次に、この発明に係る線量計１８の構成について説明する。図３は、この発明の第１実施形態に係る線量計１８の縦断面図である。また、図４は、この発明の第１実施形態に係る線量計１８の端部付近の拡大縦断面図である。さらに、図５は、この発明の第１実施形態に係る線量計１８の平面図である。
Next, the configuration of the dosimeter 18 according to the present invention will be described. FIG. 3 is a longitudinal sectional view of the dosimeter 18 according to the first embodiment of the present invention. FIG. 4 is an enlarged vertical sectional view of the vicinity of the end of the dosimeter 18 according to the first embodiment of the present invention. Furthermore, FIG. 5 is a plan view of the dosimeter 18 according to the first embodiment of the present invention.
この線量計１８は、両面に電極４１が形成された平面視において矩形状の第１板状体３１と、片面に電極４２が形成された平面視において矩形状の一対の第２板状体３２と、第１板状体３１の両側に一対の第２板状体３２を所定距離だけ離隔した状態で配置するために、平面視において中央に開口部を有する矩形状（枠状）の一対のスペーサ３３とを備える。一対の第２板状体３２は、第１板状体３１の両側に、一対の第２板状体３２の電極４２が、第１板状体３１の両面に形成された電極４１と対向する状態で、一対のスペーサ３３を介して対向配置されている。第１板状体３１、第２板状体３２およびスペーサ３３で形成される空間内には、アルゴンや窒素等の不活性ガス、あるいは、空気等の気体が封入されている。
The dosimeter 18 includes a rectangular first plate 31 in plan view in which the electrodes 41 are formed on both sides, and a pair of rectangular second plates 32 in plan view in which the electrode 42 is formed on one side. And in order to arrange the pair of second plate-like members 32 on both sides of the first plate-like member 31 in a state of being separated by a predetermined distance, a pair of rectangular (frame-like) And a spacer 33. The pair of second plate-like bodies 32 opposes the electrodes 41 formed on both sides of the first plate-like body 31 on both sides of the first plate-like body 31. In the state, they are disposed opposite to each other through the pair of spacers 33. In the space formed by the first plate-like body 31, the second plate-like body 32 and the spacer 33, an inert gas such as argon or nitrogen or a gas such as air is enclosed.
なお、第１板状体３１および第２板状体３２は、ポリカーボネートやアクリル等の透光性を有する樹脂より構成されている。また、第１板状体３１および第２板状体３２に形成された各電極４１、４２は、ＩＴＯから構成されている。さらに、スペーサ３３はＡＢＳ等の樹脂から構成されている。
The first plate-like body 31 and the second plate-like body 32 are made of a translucent resin such as polycarbonate or acrylic. The electrodes 41 and 42 formed on the first plate-like body 31 and the second plate-like body 32 are made of ITO. Further, the spacer 33 is made of resin such as ABS.
図４に示すように、一対のスペーサ３３の各々には、各スペーサ３３における外周面から第１板状体３１の表面に形成された電極４１と対向する面に至る断面がＬ字状の第１導電部４３が形成されている。また、第１板状体３１には、その両面の全域にわたって電極４１が形成されている。そして、第１導電部４３と電極４１との間には、第１導電部４３と電極４１との間を絶縁するための絶縁層４９が配設されている。この絶縁層４９は、例えば、絶縁性を有する両面接着テープから構成され、第１導電部４３と電極４１とを互いに接着する。そして、一対のスペーサ３３間には、これらのスペーサ３３に形成された一対の第１導電部４３を接続し、かつ、第１板状体３１の端縁をこの第１板状体３１の全周にわたって覆う第２導電部４４が形成されている。
As shown in FIG. 4, each of the pair of spacers 33 has an L-shaped cross section from the outer peripheral surface of each spacer 33 to the surface facing the electrode 41 formed on the surface of the first plate-like member 31. A conductive portion 43 is formed. Moreover, the electrode 41 is formed in the 1st plate-shaped body 31 over the whole area | region of the both surfaces. Further, an insulating layer 49 for insulating between the first conductive portion 43 and the electrode 41 is provided between the first conductive portion 43 and the electrode 41. The insulating layer 49 is made of, for example, an insulating double-sided adhesive tape, and bonds the first conductive portion 43 and the electrode 41 to each other. The pair of first conductive portions 43 formed on the spacers 33 are connected between the pair of spacers 33, and the edge of the first plate-like member 31 is the entire surface of the first plate-like member 31. A second conductive portion 44 which covers the circumference is formed.
第１導電部４３および第２導電部４４は、銅やアルミニウム等の導電箔から構成される。これらの第１導電部４３および第２導電部４４は、一対のスペーサ３３の表面等を通って流れるリーク電流が第１板状体３１における電極４１に流れ込まないように遮断し、また、外部からのノイズを遮蔽する機能を有する。
The first conductive portion 43 and the second conductive portion 44 are made of a conductive foil such as copper or aluminum. The first conductive portion 43 and the second conductive portion 44 block the leakage current flowing through the surface of the pair of spacers 33 and the like so as not to flow into the electrode 41 of the first plate-like body 31, and from the outside Have a function of shielding noise.
以上のような構成を有する線量計１８においては、図７および図８に示す従来の線量計１８のように、導電部４７を電極４１が形成された第１板状体３１に貼着する必要がないことから、電極４１への接触を考慮する必要はなく、容易に線量計１８を制作することが可能となる。また、第１導電部４３をスペーサ３３に貼着した上で、スペーサ３３に対して第１板状体３１と一対の第２板状体３２とを貼着することにより線量計１８を構成することができることから、第１導電部４３を容易に精度よく位置決めすることが可能となる。また、図７および図８に示す従来の線量計１８とは異なり、絶縁層４９の絶縁作用を利用することで、第１板状体３１の両面の全域にわたって電極４１を形成することができることから、第１板状体３１に対する電極４１の成膜を容易に行うことが可能となる。
In the dosimeter 18 having the above configuration, as in the conventional dosimeter 18 shown in FIGS. 7 and 8, it is necessary to bond the conductive portion 47 to the first plate-like body 31 on which the electrode 41 is formed. There is no need to consider the contact to the electrode 41, and the dosimeter 18 can be easily manufactured. Further, the first conductive portion 43 is attached to the spacer 33, and then the first plate-like body 31 and the pair of second plate-like bodies 32 are attached to the spacer 33 to constitute the dosimeter 18 It is possible to easily position the first conductive portion 43 with high accuracy. Further, unlike the conventional dosimeter 18 shown in FIGS. 7 and 8, the electrode 41 can be formed over the entire area of both surfaces of the first plate-like body 31 by utilizing the insulating function of the insulating layer 49. It becomes possible to easily perform the film formation of the electrode 41 on the first plate-like body 31.
次に、この発明の他の実施形態について説明する。図６は、この発明の第２実施形態に係る線量計１８の端部付近の拡大縦断面図である。なお、上述した第１実施形態と同様の部材については、同一の符号を付して詳細な説明を省略する。
Next, another embodiment of the present invention will be described. FIG. 6 is an enlarged vertical cross-sectional view of the vicinity of the end of the dosimeter 18 according to the second embodiment of the present invention. In addition, about the member similar to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
この第２実施形態に係る線量計１８においては、第１実施形態に係る線量計１８で使用されている絶縁層４９を省略している。そして、この第２実施形態においては、図６に示すように、第１板状体３１の表面に形成された電極４１が、第１導電部４３との接触を避けるため、矩形状の第１板状体３１の端縁から所定距離だけ離隔した領域である、中央領域にのみ形成されている。
In the dosimeter 18 according to the second embodiment, the insulating layer 49 used in the dosimeter 18 according to the first embodiment is omitted. In the second embodiment, as shown in FIG. 6, in order to avoid contact with the first conductive portion 43, the electrode 41 formed on the surface of the first plate-like body 31 has a rectangular first shape. It is formed only in the central area which is an area separated from the edge of the plate-like body 31 by a predetermined distance.
この第２実施形態に係る線量計１８においては、第１板状体３１の両面のうち、端縁付近には電極４１が形成されない構成とする必要があることから、第１板状体３１における電極４１の成膜工程は複雑にはなるが、絶縁層４９を使用することなく、第１実施形態に係る線量計１８と同様の作用効果を得ることが可能となる。
In the dosimeter 18 according to the second embodiment, the electrode 41 is not required to be formed in the vicinity of the end edge of both surfaces of the first plate-like body 31. Although the film forming process of the electrode 41 is complicated, it is possible to obtain the same function and effect as the dosimeter 18 according to the first embodiment without using the insulating layer 49.
１１ Ｘ線管
１２ コリメータ
１６ フラットパネルディテクタ
１８ 線量計
３１ 第１板状体
３２ 第２板状体
３３ スペーサ
４１ 電極
４２ 電極
４３ 第１導電部
４４ 第２導電部
４９ 絶縁層Reference Signs List 11 X-ray tube 12 collimator 16 flat panel detector 18 dosimeter 31 first plate-like body 32 second plate-like body 33 spacer 41 electrode 42 electrode 43 first conductive portion 44 second conductive portion 49 insulating layer
１２ コリメータ
１６ フラットパネルディテクタ
１８ 線量計
３１ 第１板状体
３２ 第２板状体
３３ スペーサ
４１ 電極
４２ 電極
４３ 第１導電部
４４ 第２導電部
４９ 絶縁層
Claims (3)
- 両面に電極が形成された第１板状体と、片面に電極が形成された一対の第２板状体とを備え、前記一対の第２板状体を、前記第１板状体の両側に、前記一対の第２板状体の電極が前記第１板状体の電極と対向する状態で、前記第１板状体および前記一対の第２板状体の外形に相当する矩形状を有する一対のスペーサを介して対向配置した線量計において、
前記一対のスペーサの各々に、当該スペーサにおける外周面から前記第１板状体と対向する面に至る断面がＬ字状の第１導電部を形成するとともに、
前記一対のスペーサの導電部を接続し、前記第１板状体の端縁を前記第１板状体の全周にわたって覆う第２導電部を形成することを特徴とする線量計。 A first plate-shaped body having electrodes formed on both sides thereof and a pair of second plate-shaped bodies having electrodes formed on one side thereof, the pair of second plate-shaped bodies being formed on both sides of the first plate-shaped body A rectangular shape corresponding to the outer shape of the first plate-like body and the pair of second plate-like bodies, with the electrodes of the pair of second plate-like bodies facing the electrodes of the first plate-like body In the dosimeter disposed opposite to each other through the pair of spacers,
In each of the pair of spacers, a first conductive portion having an L-shaped cross section from the outer peripheral surface of the spacer to the surface facing the first plate-like body is formed.
A dosimeter comprising: connecting a conductive portion of the pair of spacers, and forming a second conductive portion covering an edge of the first plate-like member over the entire circumference of the first plate-like member. - 請求項１に記載の線量計において、
前記第１板状体には、その両面の全域にわたって電極が形成されるとともに、
前記第１板状体における電極と、前記第１導電部との間には、絶縁層が形成される線量計。 In the dosimeter according to claim 1,
An electrode is formed on the entire surface of both surfaces of the first plate-like body, and
A dosimeter wherein an insulating layer is formed between an electrode of the first plate-like body and the first conductive portion. - 請求項１または請求項２に記載の線量計において、
前記第１板状体および前記第２板状体は、透光性を有する線量計。 In the dosimeter according to claim 1 or 2,
The said 1st plate-like body and the said 2nd plate-like body are dosimeters which have translucency.
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|---|---|---|---|---|
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| JPS57187679A (en) * | 1981-05-06 | 1982-11-18 | Commissariat Energie Atomique | Manufacture of x-ray multi-ditector proper for detecting plane x-ray beam with small thickness |
| JPS643952A (en) * | 1987-06-26 | 1989-01-09 | Mitsubishi Electric Corp | Ion chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5573872U (en) * | 1978-11-15 | 1980-05-21 | ||
| JPS55137655A (en) * | 1979-04-13 | 1980-10-27 | Toshiba Corp | Radiation detector |
| JPS57187679A (en) * | 1981-05-06 | 1982-11-18 | Commissariat Energie Atomique | Manufacture of x-ray multi-ditector proper for detecting plane x-ray beam with small thickness |
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