JPH02139839A - Relative brightness measuring device for x-ray image intensifier - Google Patents
Relative brightness measuring device for x-ray image intensifierInfo
- Publication number
- JPH02139839A JPH02139839A JP26292589A JP26292589A JPH02139839A JP H02139839 A JPH02139839 A JP H02139839A JP 26292589 A JP26292589 A JP 26292589A JP 26292589 A JP26292589 A JP 26292589A JP H02139839 A JPH02139839 A JP H02139839A
- Authority
- JP
- Japan
- Prior art keywords
- scintillator
- ray
- image intensifier
- ray image
- filter
- 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.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims abstract description 11
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000003513 alkali Substances 0.000 claims abstract description 3
- 150000004820 halides Chemical class 0.000 claims abstract description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 3
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 abstract description 6
- 239000005355 lead glass Substances 0.000 abstract description 3
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 abstract description 2
- 235000009518 sodium iodide Nutrition 0.000 abstract description 2
- 230000002463 transducing effect Effects 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の技術分野］
この発明は、Ｘ線ＴＶ装置で使用されているＸ線イメー
ジインテンシファイアの相対輝度測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a relative brightness measuring device for an X-ray image intensifier used in an X-ray TV device.
［発明の技術的背景］
従来、Ｘ線イメージインテンシファイア（以下、１．１
．と記す）の輝度の変化は、所定の線量と線質のＸ線を
１．１．に照射し、この時の１．１．出力面の明るさを
測定して、単位線量率Ｄ （ｍ Ｒ／Ｓ）とその出力面
輝度Ｂ （Ｃｄ／ｍ ２）との比［ＧＸ ＝Ｂ／Ｄ（Ｃ
ｄ／ｍ２／ＩＩＩＲ／Ｓ）］で求め、同様ノ測定法によ
る過去のある基準時点でのＧＸ （相対変換係数）
（以下、Ｘ線イメージインテンシファイアもしくは１．
１．の相対輝度という）の値との比較で行なっている。[Technical Background of the Invention] Conventionally, X-ray image intensifiers (hereinafter referred to as 1.1
．． The change in the brightness of the X-rays (denoted as 1.1. 1.1. The brightness of the output surface is measured and the ratio of the unit dose rate D (m R/S) to its output surface brightness B (Cd/m 2) [GX = B/D (C
GX (relative conversion coefficient) at a certain reference point in the past using a similar measurement method.
(Hereinafter referred to as X-ray image intensifier or 1.
1. This is done by comparing the relative brightness of
第１図は、従来から行なわれている１、１．、のＧＸ測
定法を示したものであり、（ａ）はＸ線線辺率の測定、
（ｂ）は１．１．出力面輝度の測定である。図中、１は
Ｘ線発生器、２はアルミ板、３はＸ線遮蔽板、４は線量
計のプローブ、５はＩ、１．．６は輝度計である。この
測定法では、図示のとおり線ｍ計４と輝度計６が必要で
あり、これらの測定器は使用している期間中、測定器に
狂いが生じないように常に厳重な管理と定期的な較正を
行ない、精度管理を行なっている。そして、線量計４に
おいてはそのプローブは、環境温度、湿度等に敏感で、
測定値の精度を確保するために、使用周囲環境には、常
に細心の注意を払わなければならない。又、輝度計６に
おいては、構成部品である光電子増倍管の劣化に応じ、
メータ指示値の較正を定期的に行なっている。FIG. 1 shows the conventional methods 1, 1. , which shows the GX measurement method of , where (a) is the measurement of the X-ray side ratio;
(b) is 1.1. This is a measurement of output surface brightness. In the figure, 1 is an X-ray generator, 2 is an aluminum plate, 3 is an X-ray shielding plate, 4 is a dosimeter probe, 5 is I, 1. ．． 6 is a luminance meter. This measurement method requires a line meter 4 and a luminance meter 6, as shown in the figure, and these measuring instruments must be strictly controlled and periodically checked to ensure that they do not go awry while in use. Calibration is performed and accuracy control is performed. In the dosimeter 4, the probe is sensitive to environmental temperature, humidity, etc.
In order to ensure the accuracy of measured values, close attention must always be paid to the surrounding environment of use. In addition, in the luminance meter 6, depending on the deterioration of the photomultiplier tube, which is a component,
Calibration of meter readings is performed regularly.
［背景技術の問題点コ
近時、１．１．の性能向上は著しく、Ｘ線映像診断装置
への使用が急速に普及してきた。しかしながら、この１
．１．は、使用中に輝度劣化を生じた場合には診断に支
障をきたすことになる。病院等でこのｒ、 ｒ、輝度の
変化度を調べるには、取扱技師がＸ線ＴＶ像の観察から
視感的に判断しているが、これには個人差が必るばかり
でなく、正確な経時変化を知ることができない。[Recent problems in background technology, 1.1. The performance has improved significantly, and its use in X-ray imaging diagnostic equipment has rapidly become widespread. However, this one
．． 1. If brightness deterioration occurs during use, it will impede diagnosis. In hospitals, etc., to check the degree of change in r, r, and luminance, technicians visually judge it by observing X-ray TV images, but this not only involves individual differences, but also lacks accuracy. It is not possible to know the changes over time.
従って、定量的に変化度をλ口るためには、従来は既述
のとおり、完全に管理、較正された測定器により、且つ
、扱いなれた１、１．メーカの取扱者が病院に出向き、
測定していることが多い。Therefore, in order to quantitatively measure the degree of change λ, conventionally, as mentioned above, a fully controlled and calibrated measuring instrument is used, and a well-handled measuring device 1, 1. The manufacturer's personnel go to the hospital and
Often measured.
又、線ｆｆ１ｆｆ＋ ４及び輝度計６等は、これらの測
定器が高価で且つ、取扱い上において比較的使いなれて
いないと測定ミスをすること等があるため、又、頻繁に
使用するものでないに拘らず高価でおるため、一般の病
院で常備していることはほとんどなく、院内でのＸ線作
業技師が直接測定することも、まれでおる。しかし、最
近、被検者のＸ線被爆保護という立場から、Ｔ、Ｌの輝
度変化の管理が一層要求されるようになった。In addition, the line ff1ff+ 4 and luminance meter 6, etc. are expensive, and if they are not used relatively well, measurement errors may occur, so they should not be used frequently. However, because it is expensive, it is rarely stocked in general hospitals, and it is also rare for X-ray technicians to directly measure it in the hospital. However, recently, from the standpoint of protecting the subject from exposure to X-rays, there has been a growing demand for control of changes in the brightness of T and L.
［発明の目的］
この発明の目的は、取扱い容易にして人体に有害なＸ線
を被爆することなく、安全に一般の病院等で使用中の１
．ｒ、の輝度変化を容易に測定、）８跡することができ
るＸ線イメージインテンシファイアの相対輝度測定装置
を提供することである。[Purpose of the Invention] The purpose of the invention is to make it easy to handle and to safely use it in general hospitals, etc. without exposing the human body to harmful X-rays.
．． It is an object of the present invention to provide a relative brightness measuring device for an X-ray image intensifier that can easily measure the brightness change of r.
［発明の概要］
この発明は、Ｘ線の照射により蛍光を発するシンチレー
タと、このシンチレータからの蛍光を受光して電気信号
に変換する光電変換素子と、前記光電変換素子でＸ線イ
メージインテンシファイアの出力光を測定するとき光量
を減衰させるフィルタと、前記光電変換素子の出力信号
を増幅する増幅器と、この増幅器の出力信号により入射
Ｘ線強度及びＸ線イメージインテンシファイア出力光強
度を表示できるメータとを具備することを特徴とするＸ
線イメージインテンシファイアの相対輝度測定装置であ
る。[Summary of the Invention] The present invention includes a scintillator that emits fluorescence when irradiated with X-rays, a photoelectric conversion element that receives the fluorescence from the scintillator and converts it into an electrical signal, and an X-ray image intensifier using the photoelectric conversion element. a filter that attenuates the amount of light when measuring the output light of the photoelectric conversion element, an amplifier that amplifies the output signal of the photoelectric conversion element, and an output signal of the amplifier that can display the incident X-ray intensity and the X-ray image intensifier output light intensity. X characterized by comprising a meter.
This is a relative brightness measuring device for a line image intensifier.
［発明の実施例］
以下、この発明の１．Ｉ、の相対輝度測定装置の一実施
例について第２図及び第３図を参照して説明する。本測
定装置はヘッド本体りとメータ本体旦とからなっており
、ヘッド本体ヱだけを取出して一部断面で示したものが
第３図でおる。そしてヘッド本体７は、黒色の合成樹脂
ケース９のに窓部に着脱自在に取付けられたシンチレー
タ１０７３よび前記ケース９内に配設されたＮＤフィル
タ１１、同様に前記ケース内に配設された透明な鎗ガラ
ス１２、光電変換素子１３、ＤＣ１￥１幅器１４から構
成されている。しかして、１．１．の相対輝度測定に当
り、Ｘ線強度測定時は、ＮＤフィルタの代わりにシンチ
レータ１０のみをヘッド本体前端部に着脱自在に取付け
、一方、ｒ、 Ｌの出力光強度測定時は、シンチレータ
１０のみをヘッド本体前端部に着脱自在に取り付け、使
用される。尚、前記シンチレータ１０は、入射Ｘ線の強
度に比例して蛍光を発するものである。前記ＮＤフィル
タ１１は、１．１．の出力光強度を測定する時に透過光
の強さを減衰させるためのものでおる。又、鉛ガラス１
２は、入射Ｘ線の強度を測定する時、Ｘ線の通過を遮蔽
し、シンチレータ１０の発光のみを透過させるためのも
のであるが、光電変換素子１３へのＸ線による劣化をよ
り少なくするために設けたものでおり、測定値自体には
影響がないため必ずしも必要としない。さらに前記光電
変換素子１３は前記シンチレータ１０及び■。[Embodiments of the invention] Hereinafter, 1. of the invention will be described. An embodiment of the relative brightness measuring device I will be described with reference to FIGS. 2 and 3. This measuring device consists of a head body and a meter body, and FIG. 3 shows a partial cross-section of only the head body. The head body 7 includes a scintillator 1073 removably attached to the window of a black synthetic resin case 9, an ND filter 11 disposed within the case 9, and a transparent ND filter 1073 disposed within the case 9. It is composed of a sharp glass 12, a photoelectric conversion element 13, and a DC 1\1 scale unit 14. However, 1.1. When measuring the relative brightness of X-rays, only the scintillator 10 is removably attached to the front end of the head body instead of the ND filter, while when measuring the output light intensity of R and L, only the scintillator 10 is attached. It is used by being detachably attached to the front end of the head body. Incidentally, the scintillator 10 emits fluorescence in proportion to the intensity of incident X-rays. The ND filter 11 includes 1.1. This is used to attenuate the intensity of transmitted light when measuring the output light intensity of the sensor. Also, lead glass 1
2 is for blocking the passage of X-rays and allowing only the light emitted from the scintillator 10 to pass through when measuring the intensity of incident X-rays, but it is intended to further reduce deterioration of the photoelectric conversion element 13 due to X-rays. This is provided for this purpose, and is not necessarily necessary as it does not affect the measured value itself. Furthermore, the photoelectric conversion element 13 is the scintillator 10 and (2).
■、の蛍光を電気信号に変換するためのもので、この実
施例では例えばサイドオンタイプの光電子増倍管が使用
される。又、前記ＤＣ増幅器１４は、光電変換素子１３
の出力信号を調整する手段であって本実施例では前記光
電変換素子１３の出力信号をリニアに増幅するためのも
のである。尚、前記シンチレータ１０とＮＤフィルタ１
１は、ヘッド本体りにワンタッチで着脱自在になってい
る。(2) This is for converting the fluorescence into an electrical signal, and in this embodiment, for example, a side-on type photomultiplier tube is used. Further, the DC amplifier 14 includes a photoelectric conversion element 13
This is means for adjusting the output signal of the photoelectric conversion element 13, and in this embodiment, it is for linearly amplifying the output signal of the photoelectric conversion element 13. Incidentally, the scintillator 10 and the ND filter 1
1 can be attached to and detached from the head body with a single touch.
このようなヘッド本体ヱはメータ本体旦に接続されてい
る。そして、動作時にはメータ本体旦からヘッド本体り
内のＤＣ増幅器１４へ入力電圧が供給され、光電変換素
子１３へは負の高電圧が供給される。Such a head body is connected to the meter body. During operation, an input voltage is supplied from the meter body to the DC amplifier 14 in the head body, and a negative high voltage is supplied to the photoelectric conversion element 13.
次に前記測定装置を用いて測定を行なう場合について説
明する。Next, a case in which measurement is performed using the measuring device will be described.
先ず、第４図は入射Ｘ線の強度を測定する時の例を示し
たもので、Ｘ線源としてのＸ線管１６、アルミフィルタ
１７、ヘッド本体Ｌ１天板１８．１．１．１９、光学系
２０．ＴＶカメラ２１を同一線上に配置している。前記
ＴＶカメラ２１はＴＶモニタ２２に接続され、ヘッド本
体ヱはメータ本体旦に接続されている。First, FIG. 4 shows an example of measuring the intensity of incident X-rays, which includes an X-ray tube 16 as an X-ray source, an aluminum filter 17, a head body L1 top plate 18.1.1.19, Optical system 20. A TV camera 21 is arranged on the same line. The TV camera 21 is connected to a TV monitor 22, and the head body is connected to the meter body.
尚、図中２３はＸ線グリッドである。そして、前記ヘッ
ド本体ヱにシンチレータ１０を取り付け、所定の位置（
この例では１．１．１９もしくは天板１８上の照射野中
心位置）に固定し、所定のＸ線照射条件（Ｘ線管の憶電
圧、管電流、アルミフィルタ１７、Ｘ線管１６焦点から
シンチレータ１０までの距離Ｄ２、Ｘ線絞り等）で、こ
の発明の装置のメータ本体旦の指示値を読取る。次に、
１．１．出力光の強度を測定する時は、第５図に示す例
のように、Ｘ線管１６、アルミフィルタ１７、天板１８
．１．１．１９及び光学系２４を同一線上に配置してい
る。尚、図中２３はＸ線グリッドである。そして、ヘッ
ド本体ヱに取り付けられであるシンチレータ１０を取り
外し、代わりにＮＤフィルタ１１を取り付け、所定の位
置（この例では、光学系２４のＴＶカメラ取り付は面に
、光線軸の中心とヘッド本体ヱ入射面の中心が一致する
ように、専用のヘッド取付用器具２５を作り、この器具
２５とともに取付けである）に固定し、入射Ｘ線強度を
測定した時と同じ所定のＸ線照射条件でヘッド本体ヱに
接続されＸ線遮蔽至内に配置されたメータ本体旦の指示
値を読取る。Note that 23 in the figure is an X-ray grid. Then, the scintillator 10 is attached to the head body 〇 and placed at a predetermined position (
1.1.19 or the center position of the irradiation field on the top plate 18), and set the predetermined X-ray irradiation conditions (X-ray tube storage voltage, tube current, aluminum filter 17, X-ray tube 16 from the focal point). At the distance D2 to the scintillator 10 (X-ray diaphragm, etc.), read the indicated value on the meter body of the device of the present invention. next,
1.1. When measuring the intensity of output light, as in the example shown in FIG.
．． 1.1.19 and the optical system 24 are arranged on the same line. Note that 23 in the figure is an X-ray grid. Then, remove the scintillator 10 attached to the head body, attach the ND filter 11 in its place, and place it at a predetermined position (in this example, the TV camera of the optical system 24 is attached to the surface, and the center of the light beam axis and the head body (2) Make a special head mounting device 25 so that the centers of the incident planes coincide, and fix it together with this device 25 to the same predetermined X-ray irradiation conditions as when measuring the incident X-ray intensity. Read the indicated value of the meter body connected to the head body and placed inside the X-ray shield.
次に、測定したＸ線強度りは、Ｘ線の線量率に比例、又
、１．１．出力光強度Ｂは１．１．の輝度に比例（実験
により確認済）するのでこの測定値を使い、相対変換係
数を求める。Next, the measured X-ray intensity is proportional to the X-ray dose rate, and 1.1. The output light intensity B is 1.1. Since it is proportional to the brightness of (confirmed by experiment), this measured value is used to find the relative conversion coefficient.
その計算式は次のとおりである。The calculation formula is as follows.
ＲＧｘ＝Ｂ／Ｄ
このようにして求めた相対変換係数ＧＸは、Ｘ線強度り
及び１．１．出力光強度Ｂを測定する時のヘッド本体ヱ
の取付位置が、測定開始の基ｉ％ｊ時点より、その後追
跡する時々にわたって不変であれば、被測定１．１．の
輝度変化度に比例するので、基準時点の輝度値に対して
、変化度を定量的に求めることができる。RGx=B/D The relative conversion coefficient GX obtained in this way is based on the X-ray intensity and 1.1. If the mounting position of the head body 2 when measuring the output light intensity B remains unchanged from the time point i%j of the measurement start to the subsequent tracking, then the measurement target 1.1. Since it is proportional to the degree of change in brightness, the degree of change can be quantitatively determined with respect to the brightness value at the reference time.
尚、シンチレータ１０としてはＸ線のエネルギーによっ
て発光される光の変換効率が高く、且つ、そのスペクト
ルが光電変換素子１３の分光感度に合っていれば良い。The scintillator 10 only needs to have a high conversion efficiency of light emitted by X-ray energy and whose spectrum matches the spectral sensitivity of the photoelectric conversion element 13.
シンチレータ１０の種類としては沃化ナトリウム、沃化
セシウムに代表されるアルカリハライド系のほか、硫化
物系、タングステン酸塩系及び希土類系蛍光体などで良
い結果が冑られた。As for the types of scintillator 10, good results have been achieved with alkali halide-based materials such as sodium iodide and cesium iodide, as well as sulfide-based, tungstate-based, and rare earth-based phosphors.
［発明の効果］
この発明によれば、取扱いが容易にして人体に有害なＸ
線を被爆することなく、安全に一般の病院等で使用中の
１．１．の輝度変化を容易に測定、追跡することができ
る。[Effect of the invention] According to the invention, it is possible to easily handle X, which is harmful to the human body.
1.1. Safely used in general hospitals, etc. without radiation exposure. brightness changes can be easily measured and tracked.
第１図（ａ） 、 （ｂ）は従来のＸ線線辺率と１．Ｉ
。
の輝度測定法を示した説明図、第２図はこの発明の一実
施例に係るＸ線イメージインテンシファイアの相対輝度
測定装置を示す構成図、第３図は第２図の要部（ヘッド
本体）を示す断面図、第４図はこの発明の測定装置を用
いて入射Ｘ線の強度を測定する例を示す構成図、第５図
は同じ＜１．１．出力光の強度を測定する例を示す構成
図である。
ヱ・・・ヘッド本体、 ８・・・メータ本体、９・・
・ケース、 １０・・・シンチレータ、１１・・
・ＮＤフィルタ、 １２・・・鉛ガラス、１３・・・光
電変換素子、
１４・・・ＤＣ増幅器、
１５・・・デジタルパネルメ
タ。Figures 1(a) and 1(b) show the conventional X-ray side ratio and 1. I
. FIG. 2 is a configuration diagram showing a relative brightness measuring device for an X-ray image intensifier according to an embodiment of the present invention, and FIG. 3 shows the main part of FIG. 2 (head 4 is a configuration diagram showing an example of measuring the intensity of incident X-rays using the measuring device of the present invention, and FIG. 5 is a sectional view showing the same <1.1. FIG. 3 is a configuration diagram showing an example of measuring the intensity of output light. E...Head body, 8...Meter body, 9...
・Case, 10...Scintillator, 11...
- ND filter, 12... Lead glass, 13... Photoelectric conversion element, 14... DC amplifier, 15... Digital panel meta.
Claims (2)
このシンチレータからの蛍光を受光して電気信号に変換
する光電変換素子と、前記光電変換素子でＸ線イメージ
インテンシフアイアの出力光を測定するとき光量を減衰
させるフィルタと、前記光電変換素子の出力信号を増幅
する増幅器と、この増幅器の出力信号により入射Ｘ線強
度及びＸ線イメージインテンシフアイア出力光強度を表
示できるメータとを具備することを特徴とするＸ線イメ
ージインテンシフアイアの相対輝度測定装置。(1) A scintillator that emits fluorescence when irradiated with X-rays,
a photoelectric conversion element that receives fluorescence from the scintillator and converts it into an electrical signal; a filter that attenuates the amount of light when the photoelectric conversion element measures the output light of the X-ray image intensifier; and an output of the photoelectric conversion element. Relative brightness measurement of an X-ray image intensifier, comprising an amplifier for amplifying a signal, and a meter capable of displaying incident X-ray intensity and output light intensity of the X-ray image intensifier according to the output signal of the amplifier. Device.
タングステン酸塩系、希土類系のいずれかまたはこれら
の複合された蛍光物質からなることを特徴とする特許請
求の範囲第１項記載のＸ線イメージインテンシフアイア
の相対輝度測定装置。(2) The scintillator is alkali halide, sulfide,
The relative brightness measuring device for an X-ray image intensifier according to claim 1, characterized in that it is made of a tungstate-based fluorescent material, a rare earth-based fluorescent material, or a combination thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26292589A JPH02139839A (en) | 1989-10-11 | 1989-10-11 | Relative brightness measuring device for x-ray image intensifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26292589A JPH02139839A (en) | 1989-10-11 | 1989-10-11 | Relative brightness measuring device for x-ray image intensifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02139839A true JPH02139839A (en) | 1990-05-29 |
| JPH031773B2 JPH031773B2 (en) | 1991-01-11 |
Family
ID=17382497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26292589A Granted JPH02139839A (en) | 1989-10-11 | 1989-10-11 | Relative brightness measuring device for x-ray image intensifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02139839A (en) |
-
1989
- 1989-10-11 JP JP26292589A patent/JPH02139839A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH031773B2 (en) | 1991-01-11 |
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