JPS5980082A - Digital subtraction system - Google Patents

Digital subtraction system

Info

Publication number
JPS5980082A
JPS5980082A JP57191091A JP19109182A JPS5980082A JP S5980082 A JPS5980082 A JP S5980082A JP 57191091 A JP57191091 A JP 57191091A JP 19109182 A JP19109182 A JP 19109182A JP S5980082 A JPS5980082 A JP S5980082A
Authority
JP
Japan
Prior art keywords
signal
aperture
amplifier
output
voltage
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
Application number
JP57191091A
Other languages
Japanese (ja)
Other versions
JPH0252913B2 (en
Inventor
Hiroyuki Nishioka
西岡　弘之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Shimazu Seisakusho KK
Original Assignee
Shimadzu Corp
Shimazu Seisakusho KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp, Shimazu Seisakusho KK filed Critical Shimadzu Corp
Priority to JP57191091A priority Critical patent/JPS5980082A/en
Publication of JPS5980082A publication Critical patent/JPS5980082A/en
Publication of JPH0252913B2 publication Critical patent/JPH0252913B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/548—Remote control of the apparatus or devices

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Signal Processing (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

PURPOSE:To improve the S/N ratio of an output video signal, by controlling the output of signal voltage through a switch between fluoroscopy and digital subtraction modes. CONSTITUTION:In a fluoroscopy mode an indication is given to a remote control aperture 16 of an optical system from a control panel 26 of a video processor 24 for full open of the aperture 16 via a signal line A. At the same time, the gain of an amplifier 20 of a TV camera is designated by an analog switch so that a signal current is amplified up to a prescribed level of output to the amplifier 20 via a signal line B. Furthermore the beam voltage of an image pickup tube 18 is set at an optimum level by the switch disignation. While in a continuous or serial mode, the aperture value is designated by the aperture 16 via the line A so as to obtain such quantity of light that the signal current of the tube 18 has a full swing within a dynamic range. In addition, the gain is designated with switching to the amplifier 20 by an analog switch via the line B. At the same time, the beam voltage is also controlled, and the signal voltage of a level equivalent to that of a fluoroscopy mode is delivered.

Description

【発明の詳細な説明】 本発明は、造影剤注入前後の差分画像が表示されるＸ＋
ｔｒｖ装置のディジタル　サブトラクション　システム
、とくにそのアナログ信号処理に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an X+
The present invention relates to digital subtraction systems for TRV equipment, and in particular to its analog signal processing.

ディジタル　サブトラクション　システムにおいては、
Ｘ線量子ノイズとＴＶ右カメラ゛ランダムノイズが表示
画質を決定する大きな要因となる。In digital subtraction systems,
X-ray quantum noise and TV right camera random noise are major factors that determine display image quality.

そこで、本発明の目的は′ｒｖカメラの出力映像信号の
Ｓ／Ｎ向上のはかられた、ディジタル　サブトラクショ
ン　システムを提供することである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a digital subtraction system capable of improving the S/N ratio of an output video signal of an 'rv camera.

圧制御端子及びＴＶ右カメラ映像信号増幅器のゲイン制
御端子と電気的に接続し、透視またはディジタル　妥ブ
トラクションのモード切換えによりＴＶカメラ信号電圧
の出力が調整されるようにすることにより達成される。This is achieved by electrically connecting the voltage control terminal and the gain control terminal of the TV right camera video signal amplifier so that the output of the TV camera signal voltage can be adjusted by switching the mode of fluoroscopy or digital abstraction.

この目的の達成により、ディジタル　サブトラクション
を行なうとき、撮像管の信号電流をダイナミック　レン
ジいっばいまでフルスイングすることにより、Ｓ／Ｎの
よい画像が得られる。By achieving this objective, when performing digital subtraction, an image with a good S/N ratio can be obtained by swinging the signal current of the image pickup tube to the fullest dynamic range.

なお、詳しくは、通常の透視を行なうときは、イメージ
　インテンシファイアＣ１，Ｉ　）の出力光をすべて撮
像管に入射しても、信号電流は撮像管のダイナミック　
レンジの１０分の１（約０．１μＡ）程度しか流れない
ので、′ｒＶカメラ、のアンプにて規定出力（ｌＶｐ−
ｐ）を得るように増幅し、他方デイジタル　サブトラク
ションのコンティニュアスモードまたはシリアル　モー
ドのときは、透視に比べて１００倍程度の強度なＸ線量
条件にて撮影が行なわれるため、撮像管、への入射光も
１００倍程度の照度となるので、ここで撮像管の前に絞
り等をつけて信号電流がダイナミック　レンジ内にフル
スイングする程度（約ｌμＡ）の光量になるまで絞り込
むと同時に、ＴＶ右カメラアンプの増幅度を透視時の１
０分の１程度に切換え、同様の規定出力（ｌ　ｖｌ）−
１）　）を得るようＶこする。In detail, when performing normal fluoroscopy, even if all the output light from the image intensifier C1,I) is incident on the image pickup tube, the signal current is
Since the current flows only about 1/10 of the range (approximately 0.1 μA), the specified output (lVp-
On the other hand, when digital subtraction is used in continuous mode or serial mode, the X-ray dose is approximately 100 times stronger than in fluoroscopy, so the amount of radiation to the image pickup tube is reduced. The intensity of the incident light is also about 100 times higher, so we put an aperture in front of the image pickup tube to narrow down the light intensity until the signal current fully swings within the dynamic range (approximately lμA), and at the same time 1 when looking through the amplification degree of the camera amplifier
Switch to about 1/0, and the same specified output (l vl) -
1) Rub V to obtain ).

次に、本発明の好適な実施例を図面について説明する。Next, preferred embodiments of the present invention will be described with reference to the drawings.

。 第１図は、本発明の構成例を示す概略ブロック図である
。１０はＸ線管、１２は被検体、１４はイメージ　イン
テンシファイアＣ１，Ｉ）、＋６は光学系のリモコン絞
りである。また、撮像管１８とアンプ２０からなるＴＶ
右カメラ同体で示され、２２はメイン　°アップとして
のカメラ　コントロール　ユニットであり、２４は、図
示しないＡ／Ｄ変換器、フレームメモリ、エンハンスメ
ント回路、Ｄ／Ａｉ換！、■である。. FIG. 1 is a schematic block diagram showing a configuration example of the present invention. 10 is an X-ray tube, 12 is a subject, 14 is an image intensifier C1, I), and +6 is a remote control diaphragm of the optical system. In addition, a TV consisting of an image pickup tube 18 and an amplifier 20
The right camera is shown as one unit, 22 is a camera control unit as the main camera control unit, and 24 is an A/D converter (not shown), a frame memory, an enhancement circuit, and a D/Ai converter (not shown). , ■.

本発明によれば、壕ず、透視を行なうときはビデオ　プ
ロセサ２４の操作パネル２６から光学系のリモコン絞り
１６に対して信号線■によりその絞り１６を全開するよ
う指示して作動させ、またＴＶ右カメラアンプ２０に対
しても信号線■により、０．１μＡ程度の信号電流を所
定の出力にまで増幅するように、そのゲインが、第２図
に示すようにアナログスイッチ５ＷＧＩ　により指定さ
れると同時に撮像管１８のビーム電圧も最適になるよう
、スイッチＳＷＢにより指定される。これに対し、コン
ティニュアスまだはシリアル　モードのときは信号線■
により、どちらのモードのときも撮像管１８の信号電流
がダイナミック　レンジ内をフルスイングする程度の光
量になるように、絞り値が絞り１６により指定され、さ
らにＴＶ右カメラアンプ２０に対しては信号線■Ｖζよ
りゲインが、アナログ　スイッチ５ＷＧ２により切換え
指定され、同時にスイッチＳＷＢと連動してビーム電圧
も調整され、透視時と同程度の大きさの信号電圧が出力
される。According to the present invention, when performing fluoroscopy without trenching, the operation panel 26 of the video processor 24 instructs the remote control diaphragm 16 of the optical system to fully open the diaphragm 16 through the signal line (2), and the TV For the right camera amplifier 20, the gain is specified by the analog switch 5WGI as shown in Fig. 2 so that the signal current of about 0.1 μA is amplified to a predetermined output by the signal line ■. At the same time, the beam voltage of the image pickup tube 18 is specified by the switch SWB so as to be optimum. On the other hand, when continuous mode is in serial mode, the signal line ■
Therefore, in either mode, the aperture value is specified by the aperture 16 so that the signal current of the image pickup tube 18 has an amount of light that fully swings within the dynamic range. The gain is switched and designated by the line Vζ by the analog switch 5WG2, and at the same time, the beam voltage is adjusted in conjunction with the switch SWB, and a signal voltage of the same magnitude as that during fluoroscopy is output.

第２図は、ＴＶ右カメラ構成する撮像管１８およびアン
プ回路２０において、ゲイン及びビーム電圧を切換える
方法として、それらの決定素子である抵抗値をアナログ
　スイッチＳＷＧ＋　、５ＷＧ２で切換え、また、ビー
ム電圧についても同様にスイッチＳＷＢにより切換える
構成例が示されている。Figure 2 shows how to switch the gain and beam voltage in the image pickup tube 18 and amplifier circuit 20 that make up the TV right camera, by switching the resistance values, which are determining elements thereof, using analog switches SWG+ and 5WG2, and also about the beam voltage. Similarly, a configuration example in which switching is performed by a switch SWB is shown.

なお図示しないが、本発明によれば、信号■、■の発生
源をＸ線制御器に求めても、同様の作用効果を奏する。Although not shown in the drawings, according to the present invention, similar effects can be achieved even if the sources of the signals (1) and (2) are determined from the X-ray controller.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す要部の概略ブロック図
、第２図は本発明による撮像管およびプリアンプの回路
側図である。 ＋６は光学系の絞り、＋８は撮像管、２０はアンプ、２
６は操作パネルである。 特許出願人　株式会社　島津製作所FIG. 1 is a schematic block diagram of essential parts showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of an image pickup tube and a preamplifier according to the present invention. +6 is the aperture of the optical system, +8 is the image pickup tube, 20 is the amplifier, 2
6 is an operation panel. Patent applicant: Shimadzu Corporation

Claims (1)

【特許請求の範囲】[Claims] ビデオ　プロセサの操作パネル又はＸ線制御器が、光学
系の絞り、撮像管のビーム電圧制御端子及びＴＶ右カメ
ラ映像信号増幅器のゲイン制御端子と電気的に接続され
ており、透視まだはディジタル　サブトラクションのモ
ード切換えにより信号電圧の出力が調整されるようにし
たことを特徴とする、ディジタル　サブトラクション　
システム０The operation panel of the video processor or the X-ray controller is electrically connected to the aperture of the optical system, the beam voltage control terminal of the image pickup tube, and the gain control terminal of the TV right camera video signal amplifier. Digital subtraction characterized in that the output of the signal voltage is adjusted by mode switching.
system 0
JP57191091A 1982-10-30 1982-10-30 Digital subtraction system Granted JPS5980082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57191091A JPS5980082A (en) 1982-10-30 1982-10-30 Digital subtraction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57191091A JPS5980082A (en) 1982-10-30 1982-10-30 Digital subtraction system

Publications (2)

Publication Number Publication Date
JPS5980082A true JPS5980082A (en) 1984-05-09
JPH0252913B2 JPH0252913B2 (en) 1990-11-15

Family

ID=16268702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57191091A Granted JPS5980082A (en) 1982-10-30 1982-10-30 Digital subtraction system

Country Status (1)

Country Link
JP (1) JPS5980082A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63181297A (en) * 1987-01-22 1988-07-26 Hitachi Medical Corp X-ray perspective photographing device
JPH0189500U (en) * 1987-12-04 1989-06-13
US5337341A (en) * 1992-01-31 1994-08-09 Shimadzu Corporation X-ray radiographic apparatus
EP0554800B1 (en) * 1992-01-31 1996-05-29 Shimadzu Corporation X-ray radiographic apparatus
JP2015167734A (en) * 2014-03-07 2015-09-28 株式会社日立メディコ X-ray imaging apparatus and method for adjusting movement and diaphragm of x-ray imaging part

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4940317U (en) * 1972-07-13 1974-04-09
JPS5168783A (en) * 1974-12-11 1976-06-14 Tokyo Shibaura Electric Co X sensatsueisochi
JPS5267586A (en) * 1975-11-25 1977-06-04 Philips Nv Xxray fluoroscope device
JPS5394819A (en) * 1977-01-31 1978-08-19 Shimadzu Corp Fluoroscopy switching x-rays equipment
JPS54131378A (en) * 1978-03-31 1979-10-12 Tokyo Shibaura Electric Co Ultrasonic wave diagnosis device
JPS5558682A (en) * 1978-05-16 1980-05-01 Wisconsin Alumni Res Found Method of and device for reproducing xxray video
JPS56152628A (en) * 1980-04-08 1981-11-26 Technicare Corp Dynamic photographing emphasis method and apparatus
JPS5861600A (en) * 1981-10-09 1983-04-12 Toshiba Corp X-ray diagnostic equipment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4940317U (en) * 1972-07-13 1974-04-09
JPS5168783A (en) * 1974-12-11 1976-06-14 Tokyo Shibaura Electric Co X sensatsueisochi
JPS5267586A (en) * 1975-11-25 1977-06-04 Philips Nv Xxray fluoroscope device
JPS5394819A (en) * 1977-01-31 1978-08-19 Shimadzu Corp Fluoroscopy switching x-rays equipment
JPS54131378A (en) * 1978-03-31 1979-10-12 Tokyo Shibaura Electric Co Ultrasonic wave diagnosis device
JPS5558682A (en) * 1978-05-16 1980-05-01 Wisconsin Alumni Res Found Method of and device for reproducing xxray video
JPS56152628A (en) * 1980-04-08 1981-11-26 Technicare Corp Dynamic photographing emphasis method and apparatus
JPS5861600A (en) * 1981-10-09 1983-04-12 Toshiba Corp X-ray diagnostic equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63181297A (en) * 1987-01-22 1988-07-26 Hitachi Medical Corp X-ray perspective photographing device
JPH0189500U (en) * 1987-12-04 1989-06-13
US5337341A (en) * 1992-01-31 1994-08-09 Shimadzu Corporation X-ray radiographic apparatus
EP0554800B1 (en) * 1992-01-31 1996-05-29 Shimadzu Corporation X-ray radiographic apparatus
JP2015167734A (en) * 2014-03-07 2015-09-28 株式会社日立メディコ X-ray imaging apparatus and method for adjusting movement and diaphragm of x-ray imaging part

Also Published As

Publication number Publication date
JPH0252913B2 (en) 1990-11-15

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