JPS61244177A - X-ray diagnostic device - Google Patents
X-ray diagnostic deviceInfo
- Publication number
- JPS61244177A JPS61244177A JP60085490A JP8549085A JPS61244177A JP S61244177 A JPS61244177 A JP S61244177A JP 60085490 A JP60085490 A JP 60085490A JP 8549085 A JP8549085 A JP 8549085A JP S61244177 A JPS61244177 A JP S61244177A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- insulating sheet
- ray
- detection plate
- electrostatic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000758 substrate Substances 0.000 abstract description 5
- 238000003745 diagnosis Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 28
- 238000003384 imaging method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000002601 radiography Methods 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Radiography Using Non-Light Waves (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はＸ線撮影装置の技術分野に属し、主としてＸ線
撮影装置に装置される被検体鬼透過したＸａｔ儂を、デ
ィジタル変換して、診断に供するディジタルラジオグラ
フィを対象とする。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention belongs to the technical field of X-ray imaging equipment, and is primarily used to digitally convert X-rays that pass through a subject, which is installed in the X-ray imaging equipment, to perform diagnosis. Targets digital radiography for use in
従来、Ｘｍ撮影装置、特にＸ線絵ＷＴ装置に所謂ディジ
タルラジオグラフィが組合わせられてきている。ディジ
タルラジオグラフィとは、被検体を透過したＸ１ｌｓ像
をディジタル信号に変換し、各種の画偉処理をした後、
診断に有利な各種の映倫を表示するものである。ディジ
タルラジオグラフィとしては多檜多様なものが提案され
実用化されているが、その中の一方式として静電画像方
式がある。この方式の概略を図面を参照しながら以下に
説明する。第２図は本方式でＸＭｌ像を撮影する場合の
概略図である。同図において被検体を透過したＸ線は受
像体３で吸収される。第３図に示すように受像体３は、
例えばＭ基板６の上面に、ＳｅからなるＸＩｌ検出板４
を結電し、同図に示す様な方法により、Ｘ線撮影直前に
おいてＸ＠検出板４に静電電荷を帯電させておく。また
同図においてＸ線検出板４は基板６の上に支持され、コ
ロナ放電装！１５の下を通過させる事により、前記ＸＩ
ｗ検出板４０表面に、一様に静電電荷が帯電される。前
記Ｘｉｌ検出板４が照射されたＸ１ｆｌＪを吸収すると
、そのＸ線検出板４内部で電荷が発生し、その電荷が前
記Ｘ１ｍ検出板４内部の電界からの力を受けて表面に到
達し、そのＸＳ検出板４表面の電荷を打消す。Conventionally, so-called digital radiography has been combined with Xm imaging devices, especially X-ray WT devices. Digital radiography converts the X1ls image transmitted through the subject into a digital signal, performs various image processing, and then
It displays various evaluations that are advantageous for diagnosis. A wide variety of digital radiography methods have been proposed and put into practical use, and one of them is an electrostatic imaging method. An outline of this method will be explained below with reference to the drawings. FIG. 2 is a schematic diagram when an XMl image is taken using this method. In the figure, the X-rays that have passed through the subject are absorbed by the image receptor 3. As shown in FIG. 3, the image receptor 3 is
For example, an XIl detection plate 4 made of Se is placed on the top surface of the M substrate 6.
, and the X@ detection plate 4 is charged with electrostatic charge immediately before X-ray imaging by the method shown in the figure. Also, in the figure, the X-ray detection plate 4 is supported on the substrate 6, and the corona discharge device! By passing under 15, the above XI
w The surface of the detection plate 40 is uniformly charged with electrostatic charges. When the Xil detection plate 4 absorbs the irradiated X1flJ, an electric charge is generated inside the X1m detection plate 4, and the electric charge reaches the surface due to the force from the electric field inside the X1m detection plate 4. The charge on the surface of the XS detection plate 4 is canceled.
上述の原理より、Ｘ線照射後のＸ線検出板４の表面には
Ｘ線照射量に応じた静電゛竜荷のパターンが成立する。Based on the above-mentioned principle, an electrostatic charge pattern corresponding to the amount of X-ray irradiation is established on the surface of the X-ray detection plate 4 after X-ray irradiation.
この静電電荷のパターンよりディジタル画像を得るには
、静電パターンを電気的に検出するのが一般的である。In order to obtain a digital image from this electrostatic charge pattern, it is common to detect the electrostatic pattern electrically.
第４図は電気的検出方法の構成を示すものである。同図
においてＸ線検出板４の表面から厚さｔ２の空気層を介
して、図示しない支持部に保持された検出器７が対向し
ている。FIG. 4 shows the configuration of the electrical detection method. In the figure, a detector 7 held by a support portion (not shown) faces the surface of the X-ray detection plate 4 via an air layer having a thickness t2.
同図に示すように配置すれば、前記Ｘ線検出板４の表面
上の４荷に応じて検出器７に誘導される電荷が、Ｘ線検
出板４の静電パターンに従って変動するので検出器７に
誘起された電荷を測定する串により、Ｘ線強度を測定す
る半ができる。さらに前記空気層ｔ２を一定に保持させ
ながら検出器７を、ＸＮ検出板４を結電した受像体３の
上を走査する事により前記Ｘ線検出板４の静電電荷パタ
ーンを検出する事ができ、検出結果をディジタル信号に
変換してディジタルＸ線像を得る事ができる。If arranged as shown in the figure, the charges induced in the detector 7 according to the four charges on the surface of the X-ray detection plate 4 will vary according to the electrostatic pattern of the X-ray detection plate 4, so the detector The skewer that measures the charge induced in 7 creates a half that measures the X-ray intensity. Further, the electrostatic charge pattern on the X-ray detection plate 4 can be detected by scanning the detector 7 over the image receptor 3 on which the XN detection plate 4 is energized while keeping the air layer t2 constant. The detection results can be converted into digital signals and a digital X-ray image can be obtained.
従来、以上述べてきたように検出器７とＸ線検出板４と
の空気層ｔ２を一定に保持しながら、受像体３上を走査
するのであるが、この検出器７をたとえば一般の胸部撮
影であると、縦Ｘ横が４００Ｃｓｗ）Ｘ４００［■〕ぐ
らいの範囲の面積が必要となるがこのような広い面積内
で、無視できる誤差範囲内に保持しつつ走査する半は、
電気的２機械的に、極めて困難でありＸ線検出板４にお
ける静電電荷パター゛ノとは違ったパターンとして検出
器７で検出してしまうという問題があった。Conventionally, as described above, the image receptor 3 is scanned while keeping the air layer t2 between the detector 7 and the X-ray detection plate 4 constant. Therefore, an area of about 400 Csw) x 400 [■] in length and width is required, but the half of scanning within such a large area while keeping it within a negligible error range is:
This is extremely difficult both electrically and mechanically, and there is a problem in that the detector 7 detects a pattern different from the electrostatic charge pattern on the X-ray detection plate 4.
本発明は、上記静電画像方式の精度を著しく向上させ、
より正確なＸ線診断を行なう事ができる装置の提供を目
的とする。The present invention significantly improves the accuracy of the electrostatic imaging method,
The purpose is to provide a device that can perform more accurate X-ray diagnosis.
前記目的を達成するための本発明の概要は、Ｘ線照射量
に応じて表面の静電荷パターンとして情報を保持出来る
受像体と、該受像体の表面に配置された走査を行なう弔
によって、静電電荷パターンを検出する検出器から形成
されるＸ線診断装置において、前記受像体からの静電パ
ターン検出器に積層される絶縁シートを具備し、該絶縁
シートの表面に検出器を接触させて、走査を行なう事を
特徴とする。The outline of the present invention for achieving the above object is to provide an image receptor capable of retaining information in the form of an electrostatic charge pattern on its surface depending on the amount of X-ray irradiation, and an image receptor that performs scanning arranged on the surface of the image receptor. An X-ray diagnostic apparatus formed from a detector that detects an electric charge pattern, comprising an insulating sheet laminated on the electrostatic pattern detector from the image receptor, and the detector is brought into contact with the surface of the insulating sheet. , is characterized by scanning.
本発明の一実施例の正面図を第１図に示す。同図におい
て、検出器７はＸ線検出板４に密書して支持されている
絶縁シート８に接触して走査する事ができ、該検出器７
は前記絶縁シート８に対して直角に接触している状態で
もよく直角以外の状８とＸＮ検出板４と基板６を含くむ
受像体３は、任意の面積を有する任意の形状の平面板に
形成する事ができる。本発明の従来の発明に対する性能
の比較のために、以下にその根拠となる計算式を示す。A front view of one embodiment of the present invention is shown in FIG. In the figure, a detector 7 can scan by contacting an insulating sheet 8 that is supported in secret on an X-ray detection plate 4.
may be in contact with the insulating sheet 8 at a right angle. can be formed. In order to compare the performance of the present invention with the conventional invention, the calculation formula on which it is based is shown below.
検出器７に対向する領域のＸ線検出板４の電荷をＱｓｅ
とすると、検出器７に誘起される電荷ＱＰは次式で与え
られる。The charge of the X-ray detection plate 4 in the area facing the detector 7 is Qse
Then, the charge QP induced in the detector 7 is given by the following equation.
い°ｇ、−ｘｓ検出板の比誘電率、ε１中６．３）（・
、６□・・・空気の比誘電率、 ε２中１ ）例
えばＸＷＭ検出板４の厚さｔ、−５００［／ｌ１ｍ］、
空気層の厚さｔ、−１００〔μｍ〕とすると（１）式よ
り、Ｑｐ（ｔ２−１００ Ｃμｍ） ） −−０，４４
２ＸＱｓｅ ・＋・ｔ２）ｔ２が１００［μｍ］から９
０Ｃμｍ〕に変化したとするとＱｐ（ｔ２−９０μｍ）
−−０，４６９ＸＱｓｅ ・−（３１（２１、（３１よ
り
となり、空気層ｔ２が１０μｍ変化すると検出器に誘起
される電荷Ｑｐは６％も変化する墨になる。°g, -xs The relative permittivity of the detection plate is 6.3 in ε1) (・
, 6□... Air relative permittivity, ε2 in 1) For example, the thickness t of the XWM detection plate 4, -500[/l1m],
If the thickness of the air layer is t, -100 [μm], then from equation (1), Qp(t2-100 Cμm) ) −−0,44
2XQse ・+・t2) t2 is 100 [μm] to 9
0Cμm], Qp(t2-90μm)
--0,469
第１図に示すようにＸ線検出板４に絶縁シート８を′！
ｆｊ右させ、検出器７を絶縁シート８に接触させながら
受像体３上を走査する事により、検出器７に誘起される
電荷Ｑｐの変動を著しく低減させる事ができる。又絶縁
シート８はたとえばテフロン等でもよく、他の絶縁シー
トであれば本発明の要旨内において適宜実施する事がで
きる。As shown in FIG. 1, an insulating sheet 8 is placed on the X-ray detection plate 4!
By scanning the image receptor 3 while keeping the detector 7 in contact with the insulating sheet 8 with fj to the right, fluctuations in the electric charge Qp induced in the detector 7 can be significantly reduced. The insulating sheet 8 may be made of Teflon, for example, and any other insulating sheet may be used as appropriate within the scope of the present invention.
次に、絶縁シート８の比誘電率は通常空気の比誘電率よ
り大きいので、検出器７に誘起される電荷を増大させる
串が出来る。例えば厚さ１００〔μｍ〕の例えばテフロ
゛・材を使用した場合、比［を率が２．０であるので（
１）式より
Ｑｐｔｔ２−１００１ｔｍ）−０，６ｌ−３ＸＱｓｅ
・曲＋ （５１となり、ギャップ層が空気を使用したも
のと比較なすると約４０（ト）も大きな電荷な誘起する
事が出来る。このため、検出器７の感度を著しく増大さ
せる事が出来る。また検出器７の感度の同上を考慮する
必要がない場合は被検体へのＸ線被曝線量を少なくして
、被検体の安全を図ることもできる。Next, since the dielectric constant of the insulating sheet 8 is normally larger than that of air, a skewer is formed that increases the electric charge induced in the detector 7. For example, if a Teflon material with a thickness of 100 [μm] is used, the ratio [is 2.0, so (
1) From the formula, Qptt2-1001tm)-0,6l-3XQse
・Song + (51), and compared to a gap layer using air, it is possible to induce a larger charge of about 40 (t). Therefore, the sensitivity of the detector 7 can be significantly increased. Furthermore, if there is no need to take into account the sensitivity of the detector 7, the X-ray exposure dose to the subject can be reduced to ensure the safety of the subject.
以上詳述したように本発明によると以下に述べるような
効果を奏する事ができる。従来、空気をギャップ層とし
た部分（＝厚さが一様な絶縁シート８を用いる事により
、検出器７とＸ線検出板４とのギャップ層の走査中の距
離を一定に保持する事ができるので、前記Ｘ＃Ｊ検出板
４における静電電荷パターンと検出器７に誘起される電
荷との誤差を著しく低減する串ができる。次に、従来ギ
ャップ層として空気であったものが通常比誘電率の高い
他の絶縁シートに置換されるため、検出５７に誘起され
る電荷が著しく増加し検出器７の感度を著しくｍ１させ
る事ができ、また検出器７の感度を上げずに被検体への
Ｘ線照射にする影響を考慮したい場合には、通常のＸ線
＠曝線量を少なくして被検体への安全を図ることができ
る。As detailed above, according to the present invention, the following effects can be achieved. Conventionally, by using an insulating sheet 8 with a uniform thickness, the gap layer distance between the detector 7 and the X-ray detection plate 4 can be kept constant during scanning. As a result, a skewer can be created that significantly reduces the error between the electrostatic charge pattern on the X#J detection plate 4 and the charge induced in the detector 7.Next, the conventional gap layer is made of air. Since it is replaced with another insulating sheet with a high dielectric constant, the charge induced in the detector 57 increases significantly, and the sensitivity of the detector 7 can be significantly increased m1. If it is desired to take into consideration the influence of X-ray irradiation on the subject, the normal X-ray @ exposure dose can be reduced to ensure safety for the subject.
第１図は本発明の一実施例としてのＸ線検出板４上の静
電電荷パターンを検出する方法を示す正面図、第２図は
静電画像方式での撮影方法の概略因、第３図は受像体３
に結電したＸ線検出板４に静電電荷を帯電させる方法の
一例を示す斜視図、第４図は従来の方法でのＸ線検出板
４の静電電荷パターンの検出方法を示す正面図である。
３・・・受像体、 ４・・・Ｘ４１Ｊ１検出板、
５・・・コロナ放電装置、 ６・・・基板、 ７・・・
検出器、 ８・・・絶縁シート。FIG. 1 is a front view showing a method for detecting an electrostatic charge pattern on an X-ray detection plate 4 as an embodiment of the present invention, FIG. The figure shows image receptor 3.
FIG. 4 is a perspective view showing an example of a method for charging an electrostatic charge to the X-ray detection plate 4, which has been electrically connected to the X-ray detection plate 4; FIG. It is. 3... Image receptor, 4... X41J1 detection plate,
5...Corona discharge device, 6...Substrate, 7...
Detector, 8...Insulating sheet.
Claims (1)
保持出来る受像体と、該受像体の表面に配置され走査を
行なう事によつて、静電電荷パターンを検出する検出器
から形成されるＸ線診断装置において、前記受像体から
の静電パターン検出器に積層される絶縁シートを具備し
、該絶縁シートの表面に検出器を接触させて、走査を行
なう事を特徴とするＸ線診断装置。It consists of an image receptor that can hold information as an electrostatic charge pattern on its surface depending on the amount of X-ray irradiation, and a detector that is placed on the surface of the image receptor and detects the electrostatic charge pattern by scanning. An X-ray diagnostic apparatus comprising an insulating sheet laminated on an electrostatic pattern detector from the image receptor, and scanning is performed by bringing the detector into contact with the surface of the insulating sheet. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60085490A JPS61244177A (en) | 1985-04-23 | 1985-04-23 | X-ray diagnostic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60085490A JPS61244177A (en) | 1985-04-23 | 1985-04-23 | X-ray diagnostic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61244177A true JPS61244177A (en) | 1986-10-30 |
Family
ID=13860366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60085490A Pending JPS61244177A (en) | 1985-04-23 | 1985-04-23 | X-ray diagnostic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61244177A (en) |
-
1985
- 1985-04-23 JP JP60085490A patent/JPS61244177A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2359472A (en) | Radiation inspection system | |
| KR20020011383A (en) | Radiation detector, an apparatus for use in planar beam radiography and a method for detecting ionizing radiation | |
| JPH0233975B2 (en) | ||
| JP2003519388A (en) | Method and apparatus for radiography and radiation detector | |
| JP2769558B2 (en) | Slit radiographic equipment with image equalization | |
| JP2000039408A (en) | Device for measuring characteristic of web of traveling paper material and planar type detector of multi segment | |
| JP3081002B2 (en) | Test object inspection device by gamma or X-ray | |
| JPS61244177A (en) | X-ray diagnostic device | |
| JPH0318352A (en) | X-ray diagnosing device | |
| JPS63256844A (en) | X-ray device | |
| JPH04353791A (en) | Scattering ray imaging device | |
| JPS62228939A (en) | Method of aligning x-ray beam-collimator with linear array detector plate | |
| JP3918430B2 (en) | Radiation inspection equipment | |
| JP2003121551A (en) | Radiation detector and method of manufacturing the same, and x-ray ct equipment | |
| JP2002303592A (en) | Tomographic equipment | |
| JPS59136670A (en) | Method of inspecting plane radiation photograph of body and ionization chamber for executing said method | |
| US4567530A (en) | Read-out devices of electric charge distributions on dielectric surfaces | |
| JPH04503910A (en) | slit radiography device | |
| RU2148816C1 (en) | Long-piece x-ray tomograph | |
| JP2001153817A (en) | X-ray laminographic device | |
| JPS6274335A (en) | X-ray tomographic apparatus | |
| JPH03251231A (en) | X-ray photographing device | |
| US6804322B2 (en) | X-ray image converter, device and method for recording, processing and illustrating images using X-rays | |
| JP2933316B2 (en) | X-ray detector | |
| JPS62269083A (en) | Ion beam profile monitor |