JPH0654257A - Digital subtraction angiography device - Google Patents

Digital subtraction angiography device

Info

Publication number
JPH0654257A
JPH0654257A JP4223621A JP22362192A JPH0654257A JP H0654257 A JPH0654257 A JP H0654257A JP 4223621 A JP4223621 A JP 4223621A JP 22362192 A JP22362192 A JP 22362192A JP H0654257 A JPH0654257 A JP H0654257A
Authority
JP
Japan
Prior art keywords
image
converter
gamma
gamma correction
correction curve
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
Application number
JP4223621A
Other languages
Japanese (ja)
Inventor
Masayuki Tsuruoka
真之 鶴岡
Akinori Takahashi
昭紀 高橋
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.)
Hitachi Healthcare Manufacturing Ltd
Original Assignee
Hitachi Medical Corp
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 Hitachi Medical Corp filed Critical Hitachi Medical Corp
Priority to JP4223621A priority Critical patent/JPH0654257A/en
Publication of JPH0654257A publication Critical patent/JPH0654257A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve the diagnostic performance by setting optionally the adjustment of the image contrast. CONSTITUTION:The image processed by a computing element 7 is inputted to a gradation processor 9 and adjusted through the setting of a window level and the selection of a gamma correction curve. The gamma correction curve is selected by one out of a gamma table. If the corresponding curve is not contained in the gamma table, an optical gamma correction curve is prepared by a gamma table preparation part 18 ad used. Thus since an optional gamma correction curve can be set by the part 18 and therefore an image with a proper contrast and the proper density is obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は血管造影検査等に用いる
ディジタル・サブトラクション・アンジオグラフィ装置
(以下、DSA装置という)に係り、特に画像のコント
ラスト、濃度の調整に好適な技術に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital subtraction angiography apparatus (hereinafter referred to as a DSA apparatus) used for angiography and the like, and more particularly to a technique suitable for adjusting image contrast and density.

【0002】[0002]

【従来の技術】DSA装置は、被検体からの透過X線を
I.I.により光学像に変換し、この光学像をテレビカ
メラに入力してビデオ信号に変換する。このビデオ信号
はA/D変換器に入力されディジタル化され画像として
メモリ内に保管される。また、被検体の血管に造影剤を
注入して前述と同様に透視をして、造影剤の入った画像
をメモリに保管する。そして、この造影剤の映った画像
と映らない画像とを演算器で引き算し、この演算結果を
階調処理装置へ出力する。階調処理装置ではウインドウ
・レベルを設定しさらにガンマ補正を行うためのガンマ
補正曲線をガンマテーブルから選択して画像のコントラ
ストを調整していた。階調処理装置で調整された画像は
D/A変換器に入力しビデオ信号に変換され表示装置で
表示される。また、前記ガンマテーブルは明るい部分の
強調、暗い部分の強調などの目的に応じたガンマ補正曲
線が複数用意されていた。
2. Description of the Related Art A DSA apparatus is a system for transmitting transmitted X-rays from a subject under an I.D. I. The optical image is converted into a video signal by inputting the optical image to a television camera. This video signal is input to the A / D converter, digitized and stored in the memory as an image. Further, a contrast agent is injected into the blood vessel of the subject, and fluoroscopy is performed in the same manner as described above, and the image containing the contrast agent is stored in the memory. Then, the image in which the contrast agent is reflected and the image in which the contrast agent is not reflected are subtracted by the calculator, and the calculation result is output to the gradation processing device. In the gradation processing device, a window level is set and a gamma correction curve for performing gamma correction is selected from a gamma table to adjust the contrast of an image. The image adjusted by the gradation processing device is input to the D / A converter, converted into a video signal, and displayed on the display device. Further, the gamma table has prepared a plurality of gamma correction curves according to the purpose of emphasizing a bright portion and a dark portion.

【0003】[0003]

【発明が解決しようとする課題】上記従来装置では、階
調処理装置に入力した画像をウインドウ・レベルの設定
及びガンマ補正を行うことにより画像調整を行ってい
る。そして、ガンマ補正は予め決められたガンマ補正曲
線の中から選択して行っていた。そのため、画像調整の
範囲が限られてしまい、コントラストの微妙な表現がで
きなかった。
In the above-mentioned conventional apparatus, the image input to the gradation processing apparatus is adjusted by setting the window level and gamma correction. Then, the gamma correction is performed by selecting from a predetermined gamma correction curve. As a result, the range of image adjustment is limited, and it is not possible to express a delicate contrast.

【0004】そこで本発明の目的は、画像のコントラス
ト調整を任意に設定して診断能の向上を図ることにあ
る。
Therefore, an object of the present invention is to improve the diagnostic ability by arbitrarily setting the contrast adjustment of an image.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するため
に、被検体にX線を照射するX線管球と、このX線管球
と対向配置され被検体の透過X線を光学像に変換する検
出器と、この出力光学像を撮影するテレビカメラと、こ
のテレビカメラからの出力信号をディジタル化するA/
D変換器と、このA/D変換器からのデータを一連の画
像として記憶する記憶装置と、この記憶装置内の画像間
で加減算を行う演算器と、この演算器からの出力画像の
コントラストや濃度を調整する階調処理装置と、この階
調処理装置の出力画像をビデオ信号にアナログ化するD
/A変換器と、このD/A変換器からの画像データを表
示する表示装置と、上記各構成要素を制御する制御部と
を有するDSA装置において、上記階調処理装置内のガ
ンマテーブルに任意のガンマ補正曲線を設定するガンマ
テーブル作成部を備えたものである。
In order to achieve the above object, an X-ray tube for irradiating a subject with X-rays, and an X-ray tube which is arranged so as to face the X-ray tube as an optical image. A detector for converting, a television camera for photographing the output optical image, and an A / D for digitizing the output signal from the television camera.
A D converter, a storage device that stores data from the A / D converter as a series of images, a computing unit that performs addition and subtraction between images in the storage device, and a contrast of an output image from the computing unit. A gradation processing device for adjusting the density, and D for analogizing an output image of the gradation processing device into a video signal.
In a DSA device having an A / A converter, a display device for displaying image data from the D / A converter, and a control unit for controlling each of the above-mentioned components, a gamma table in the gradation processing device can be arbitrarily set. It is provided with a gamma table creating unit for setting the gamma correction curve of.

【0006】[0006]

【作用】演算器で処理された画像は階調処理装置へ入力
され、ウインドウ・レベルの設定及びガンマ補正曲線の
選択を行って画像調整をする。このとき、ガンマ補正曲
線はガンマテーブルの中から一つを選択するが、この中
に該当するものがないときにはガンマテーブル作成部に
より任意のガンマ補正曲線を作成し、この作成したガン
マ補正曲線を選択して使用する。これにより、画像のコ
ントラストや濃度の調整が任意にさらに微妙に行うこと
ができ診断能が向上する。
The image processed by the arithmetic unit is input to the gradation processing device, and the image level is adjusted by setting the window level and selecting the gamma correction curve. At this time, one gamma correction curve is selected from the gamma table, but if there is no corresponding gamma correction curve, the gamma table creation unit creates an arbitrary gamma correction curve and selects the created gamma correction curve. To use. As a result, the contrast and density of the image can be adjusted more finely and the diagnostic ability is improved.

【0007】[0007]

【実施例】以下、本発明の一実施例を図1及び図2によ
り説明する。図1は本発明の構成を示すブロック図、図
2は本発明のガンマテーブル作成部の説明図である。1
はX線管球、2は被検体17のX線像を光学像に変換す
るI.I.、3はI.I.2の光学像をテレビカメラ4
へ導くディストリビュータ、4はI.I.2の光学像を
ビデオ信号に変換するテレビカメラ、5はテレビカメラ
4のビデオ信号をディジタル変換するA/D変換器、6
はディジタルの映像信号を画像として保管する一時記憶
装置、7は一時記憶装置6内の画像間で加減算を行う演
算器、8は演算された画像の画像処理を行って表示する
画像表示装置で画像のコントラストや濃度を調整する階
調処理装置9とこの階調処理装置9の出力信号をビデオ
信号に変換するD/A変換器10とこのビデオ信号を表
示する表示装置11よりなる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a configuration of the present invention, and FIG. 2 is an explanatory diagram of a gamma table creating unit of the present invention. 1
Is an X-ray tube, 2 is an I.D. for converting an X-ray image of the subject 17 into an optical image. I. 3 is I. I. 2 optical image on TV camera 4
Distributor leading to I. I. A television camera 5 for converting the optical image of 2 into a video signal, 5 is an A / D converter for digitally converting the video signal of the television camera 4, 6
Is a temporary storage device for storing a digital video signal as an image, 7 is a computing unit for performing addition and subtraction between images in the temporary storage device 6, and 8 is an image display device for performing image processing of the computed image and displaying the image. And a D / A converter 10 for converting an output signal of the gradation processing device 9 into a video signal and a display device 11 for displaying the video signal.

【0008】12はX線制御装置14、テレビカメラ
4、一時記憶装置6、演算器7、階調処理装置9及びガ
ンマテーブル作成部18を制御する制御装置、13は制
御装置12を操作する操作卓、14はX線の発生を制御
するX線制御装置、15はX線管球1に印加する高電圧
を発生するX線発生用高電圧装置、16は天板、17は
被検体、18は任意のガンマ補正曲線を設定するガンマ
テーブル作成部である。
Reference numeral 12 is a control device for controlling the X-ray control device 14, television camera 4, temporary storage device 6, computing unit 7, gradation processing device 9 and gamma table creating section 18, and 13 is an operation for operating the control device 12. A table, 14 is an X-ray control device for controlling the generation of X-rays, 15 is a high-voltage device for generating X-rays that applies a high voltage to the X-ray tube 1, 16 is a top plate, 17 is a subject, 18 Is a gamma table creation unit for setting an arbitrary gamma correction curve.

【0009】次に本実施例の動作を説明する。操作卓1
3よりX線撮影条件を入力しX線照射スイッチを押す
と、制御装置12より制御信号S1がX線制御装置14
へ送信されX線管球1へ設定した管電圧や管電流等を印
加するようX線発生用高電圧装置15を制御する。高電
圧装置15により高電圧がX線管球1へ印加されると、
X線が照射され被検体17を透過してI.I.2に入力
し光学像に変換される。この光学像は、ディストリビュ
ータ3により案内されて制御装置12からの制御信号S
2により制御されたテレビカメラ4に入力しビデオ信号
をA/D変換器5に入力する。
Next, the operation of this embodiment will be described. Console 1
When the X-ray imaging conditions are input from 3 and the X-ray irradiation switch is pressed, the control signal S1 is transmitted from the control device 12 to the X-ray control device 14.
The high voltage device 15 for X-ray generation is controlled so that the tube voltage, the tube current, etc., which are transmitted to the X-ray tube 1, are applied to the X-ray tube 1. When a high voltage is applied to the X-ray tube 1 by the high voltage device 15,
X-rays are emitted, transmitted through the subject 17, and transmitted to the I.D. I. 2 is input and converted into an optical image. This optical image is guided by the distributor 3 and the control signal S from the control device 12 is sent.
The video signal is input to the television camera 4 controlled by 2, and the video signal is input to the A / D converter 5.

【0010】A/D変換器5でビデオ信号をディジタル
映像信号に変換し、制御装置12の制御信号S3により
指定された一時記憶装置6の保管場所に保管する。ま
た、被検体17に造影剤を注入して前述と同様にI.
I.2で光学像を検出してテレビカメラ4でビデオ信号
にしA/D変換器5でディジタル映像信号に変換して一
時記憶装置6に保管する。そして、制御装置12の制御
信号S4により一時記憶装置6内の画像を選択し演算器
7で引き算をする。引き算された画像は階調処理装置9
に入力され、制御装置12の制御信号S5によりウイン
ドウ・レベルを設定し、またガンマテーブルよりガンマ
補正曲線を選択して画像のコントラストや濃度を調整す
る。
The A / D converter 5 converts the video signal into a digital video signal and stores it in the storage place of the temporary storage device 6 designated by the control signal S3 of the control device 12. Further, a contrast agent is injected into the subject 17 and the I.I.
I. The optical image is detected by 2 and converted into a video signal by the TV camera 4 and converted into a digital video signal by the A / D converter 5 and stored in the temporary storage device 6. Then, the image in the temporary storage device 6 is selected by the control signal S4 of the control device 12, and the arithmetic unit 7 subtracts the image. The subtracted image is a gradation processing device 9
The window level is set by the control signal S5 of the control device 12, and the gamma correction curve is selected from the gamma table to adjust the contrast and density of the image.

【0011】このとき、画像に対応するガンマ補正曲線
がない場合にはガンマテーブル作成部18により例えば
操作卓13のトラックボールでグラフを描きこのグラフ
をスムージング処理することで任意のガンマ補正曲線を
設定して、この設定したガンマ補正曲線を階調処理装置
9のガンマテールへ入力し選択することで希望のコント
ラストや濃度に調整する。そして、階調処理装置9で処
理された映像信号をD/A変換器10に入力しビデオ信
号に変換しCRT等で構成される表示装置11に表示す
る。
At this time, when there is no gamma correction curve corresponding to the image, the gamma table creating section 18 draws a graph with, for example, the trackball of the console 13 and smoothes this graph to set an arbitrary gamma correction curve. Then, the set gamma correction curve is input to the gamma tail of the gradation processing device 9 and selected to adjust to the desired contrast or density. Then, the video signal processed by the gradation processing device 9 is input to the D / A converter 10, converted into a video signal, and displayed on the display device 11 composed of a CRT or the like.

【0012】これにより、ガンマテーブル作成部18で
任意のガンマ補正曲線を設定できるため、適正なコント
ラスト及び濃度の画像を得ることができる。
As a result, the gamma table creating section 18 can set an arbitrary gamma correction curve, so that an image with proper contrast and density can be obtained.

【0013】[0013]

【発明の効果】本発明によれば、ガンマテーブル作成部
によりガンマ補正曲線を自由に設定できるため、予め決
められたガンマ補正曲線を用いた場合では識別が困難で
あった部分等を識別可能にすることができ、また識別不
要部分を同じコントラスト等にすることにより診断能率
が向上する。
According to the present invention, since the gamma correction curve can be freely set by the gamma table creating section, it is possible to identify a portion or the like which is difficult to identify when a predetermined gamma correction curve is used. Moreover, the efficiency of diagnosis is improved by making the non-identification portions have the same contrast or the like.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の構成を示すブロック図FIG. 1 is a block diagram showing the configuration of the present invention.

【図2】本発明のガンマテーブル作成部の説明図FIG. 2 is an explanatory diagram of a gamma table creating unit of the present invention.

【符号の説明】[Explanation of symbols]

1 X線管球 2 I.I. 3 ディストリビュータ 4 テレビカメラ 5 A/D変換器 6 一時記憶装置 7 演算器 9 階調処理装置 10 D/A変換器 11 表示装置 12 制御装置 13 操作卓 18 ガンマテーブル作成部 1 X-ray tube 2 I. I. 3 Distributor 4 Television Camera 5 A / D Converter 6 Temporary Storage Device 7 Calculator 9 Gradation Processing Device 10 D / A Converter 11 Display Device 12 Control Device 13 Operator's Table 18 Gamma Table Creation Unit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】被検体にX線を照射するX線管球と、この
X線管球と対向配置され被検体の透過X線を光学像に変
換する検出器と、この出力光学像を撮影するテレビカメ
ラと、このテレビカメラからの出力信号をディジタル化
するA/D変換器と、このA/D変換器からのデータを
一連の画像として記憶する記憶装置と、この記憶装置内
の画像間で加減算を行う演算器と、この演算器からの出
力画像のコントラストや濃度を調整する階調処理装置
と、この階調処理装置の出力画像をビデオ信号にアナロ
グ化するD/A変換器と、このD/A変換器からの画像
データを表示する表示装置と、上記各構成要素を制御す
る制御部とを有するディジタル・サブトラクション・ア
ンジオグラフィ装置において、上記階調処理装置内のガ
ンマテーブルに任意のガンマ補正曲線を設定するガンマ
テーブル作成部を備えたことを特徴とするディジタル・
サブトラクション・アンジオグラフィ装置。
1. An X-ray tube for irradiating a subject with X-rays, a detector arranged to face the X-ray tube and converting transmitted X-rays of the subject into an optical image, and an output optical image of the detector. Television camera, an A / D converter for digitizing an output signal from the television camera, a storage device for storing the data from the A / D converter as a series of images, and an image between the images in the storage device. An arithmetic unit that performs addition and subtraction in step 1, a gradation processing device that adjusts the contrast and density of an output image from this arithmetic unit, a D / A converter that converts the output image of this gradation processing device into a video signal, In a digital subtraction angiography apparatus having a display device for displaying the image data from the D / A converter and a control unit for controlling each of the above-mentioned components, an arbitrary gamma table in the gradation processing device is provided. Digital, characterized in that it comprises a gamma table creation unit for setting a gamma correction curve,
Subtraction angiography device.
JP4223621A 1992-07-31 1992-07-31 Digital subtraction angiography device Pending JPH0654257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4223621A JPH0654257A (en) 1992-07-31 1992-07-31 Digital subtraction angiography device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4223621A JPH0654257A (en) 1992-07-31 1992-07-31 Digital subtraction angiography device

Publications (1)

Publication Number Publication Date
JPH0654257A true JPH0654257A (en) 1994-02-25

Family

ID=16801080

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4223621A Pending JPH0654257A (en) 1992-07-31 1992-07-31 Digital subtraction angiography device

Country Status (1)

Country Link
JP (1) JPH0654257A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905650A2 (en) * 1997-09-24 1999-03-31 Canon Kabushiki Kaisha Image enhancement processing apparatus and method
US6833876B1 (en) 2000-02-16 2004-12-21 Zilog, Inc. Using a reduced memory look up table for gamma correction through interpolation
JP2009118985A (en) * 2007-11-14 2009-06-04 Ge Medical Systems Global Technology Co Llc X-ray ct apparatus
US7887371B2 (en) 2004-06-23 2011-02-15 Amphenol Corporation Electrical connector incorporating passive circuit elements
US8382524B2 (en) 2010-05-21 2013-02-26 Amphenol Corporation Electrical connector having thick film layers
US8591257B2 (en) 2011-11-17 2013-11-26 Amphenol Corporation Electrical connector having impedance matched intermediate connection points
US8734185B2 (en) 2010-05-21 2014-05-27 Amphenol Corporation Electrical connector incorporating circuit elements
KR20150033724A (en) * 2012-08-14 2015-04-01 제이에프이 스틸 가부시키가이샤 Method for controlling solidification completion position and device for controlling solidification completion position

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905650A2 (en) * 1997-09-24 1999-03-31 Canon Kabushiki Kaisha Image enhancement processing apparatus and method
US6449390B1 (en) 1997-09-24 2002-09-10 Canon Kabushiki Kaisha Image processing apparatus and method therefor
EP0905650B1 (en) * 1997-09-24 2005-12-14 Canon Kabushiki Kaisha Image enhancement processing apparatus and method
US6833876B1 (en) 2000-02-16 2004-12-21 Zilog, Inc. Using a reduced memory look up table for gamma correction through interpolation
US8123563B2 (en) 2004-06-23 2012-02-28 Amphenol Corporation Electrical connector incorporating passive circuit elements
US7887371B2 (en) 2004-06-23 2011-02-15 Amphenol Corporation Electrical connector incorporating passive circuit elements
JP2009118985A (en) * 2007-11-14 2009-06-04 Ge Medical Systems Global Technology Co Llc X-ray ct apparatus
US8382524B2 (en) 2010-05-21 2013-02-26 Amphenol Corporation Electrical connector having thick film layers
US8734185B2 (en) 2010-05-21 2014-05-27 Amphenol Corporation Electrical connector incorporating circuit elements
US9722366B2 (en) 2010-05-21 2017-08-01 Amphenol Corporation Electrical connector incorporating circuit elements
US10186814B2 (en) 2010-05-21 2019-01-22 Amphenol Corporation Electrical connector having a film layer
US11336060B2 (en) 2010-05-21 2022-05-17 Amphenol Corporation Electrical connector having thick film layers
US8591257B2 (en) 2011-11-17 2013-11-26 Amphenol Corporation Electrical connector having impedance matched intermediate connection points
KR20150033724A (en) * 2012-08-14 2015-04-01 제이에프이 스틸 가부시키가이샤 Method for controlling solidification completion position and device for controlling solidification completion position

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