JPS5970386A - Processor of x-ray picture - Google Patents

Processor of x-ray picture

Info

Publication number
JPS5970386A
JPS5970386A JP57181954A JP18195482A JPS5970386A JP S5970386 A JPS5970386 A JP S5970386A JP 57181954 A JP57181954 A JP 57181954A JP 18195482 A JP18195482 A JP 18195482A JP S5970386 A JPS5970386 A JP S5970386A
Authority
JP
Japan
Prior art keywords
converter
image
memory
contrast medium
reference 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.)
Pending
Application number
JP57181954A
Other languages
Japanese (ja)
Inventor
Koichi Shibata
幸一 柴田
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 JP57181954A priority Critical patent/JPS5970386A/en
Publication of JPS5970386A publication Critical patent/JPS5970386A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

PURPOSE:To attain ease of scaling and to decrease the number of peripheral devices of an A/D converter, by deciding suitably a reference voltage for the A/D converter after and before the incoming of a contrast medium. CONSTITUTION:An image before the contrast medium incomes is digitized by the A/D converter 22 to which a voltage of a constant voltage source 26 is inputted as the reference voltage by selecting a switch 27 to the terminal (a) position, and stored in a memory 23 as a mask image. The switch 27 is selected to the terminal position (b) after the incoming of the contrast medium and the content of the memory 23 is inputted to the A/D converter 22 as the reference voltage via a D/A converter 24 and an amplifier 25. An output of the A/D converter 22 is given to a TV monitor 17 via an amplifier 15 and a D/A converter 16. The content of the memory 23 is read out in good timing by means of an address controller so that the address is coincident with each image address of the output image of an image pickup tube 10.

Description

【発明の詳細な説明】 本発明は、サブトラクション機能の有するX線画像処理
装置、とぐにX線信号のディジタル化処理に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray image processing apparatus having a subtraction function, and more particularly to digitization processing of X-ray signals.

血管造影などに用いられるX線ディジタル サブトラク
ション装置では、良好な画質を得るために、X線ビデオ
信号のレベルをA/D変換器の入力レンジに、いっばい
にすること(スケーリング)が必要であり、このスケー
リングのために、数回のX線ば〈射テストなどX線条件
の設定方法が繁雛になるという問題があった。また、従
来例では、A/D変換器の前後にログ(LOG)変換器
、゛減算器などを必要とし、その設計など、装置も複雑
であるという欠点があった。
In an X-ray digital subtraction device used for angiography, etc., in order to obtain good image quality, it is necessary to match the level of the X-ray video signal to the input range of the A/D converter (scaling). Due to this scaling, there was a problem in that the method of setting the X-ray conditions, such as several X-ray radiation tests, became complicated. Further, the conventional example requires a log converter, a subtracter, etc. before and after the A/D converter, and has the disadvantage that the design and other devices are complicated.

本発明の目的は、前記問題点にかんがみて、スケーリン
グが容易で、かつA/D変換器の周辺装置点数を減らす
ことのできる、X線画像処理装置を提供することにある
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an X-ray image processing device that is easy to scale and can reduce the number of peripheral devices for an A/D converter.

この目的は、A/D変換器の参考或いは基準電圧として
、造影剤到来前には、一定値を、他方造影剤到来後には
、造影剤到来前又は1フレーム前の画像信号アナログ変
換値を、入力してX線ビデオ信号のディジタル化を行な
うことにより、造影剤到来前後の画像間の割算が行なわ
れ、これにより得たディジタル値を強調し、アナログ化
して、表示及び記録することにより達成され、この場合
A/D変換器の入力レンジによる制限がなく、X線条件
の許容範囲が広くなり、他方ログ変換器、減算器は使用
されず、変化、差分値を抽出できる。
The purpose of this is to use a constant value as a reference or reference voltage for the A/D converter before the arrival of the contrast agent, and use the analog conversion value of the image signal before the arrival of the contrast agent or one frame before the arrival of the contrast agent after the arrival of the contrast agent. By digitizing the input X-ray video signal, division between the images before and after the arrival of the contrast agent is performed, and this is achieved by emphasizing the digital values obtained, converting them into analogs, and displaying and recording them. In this case, there is no restriction due to the input range of the A/D converter, and the allowable range of X-ray conditions is widened. On the other hand, a log converter and a subtracter are not used, and changes and difference values can be extracted.

本発明の要旨および好適な実施例は、図面についての説
明から明らかである。
The gist and preferred embodiments of the invention will be apparent from the description of the drawings.

第1図は、従来のX線ディジタル サブトラフシラン装
置の概略ブロック図であり、第2図は、本発明の一実施
例を示す概略ブロック図である。
FIG. 1 is a schematic block diagram of a conventional X-ray digital subtrough silane device, and FIG. 2 is a schematic block diagram showing an embodiment of the present invention.

図中において、10は撮像管、11はログ変換器、12
はA/D変換器、13は画像フレームメモリであり、1
3 aはマスク像メモリ、13 bはライブ像メモリと
して示される。また、14は減算器、15は強調器、1
6はD/A変換器、 17はTVモニタである。
In the figure, 10 is an image pickup tube, 11 is a log converter, and 12 is a log converter.
is an A/D converter, 13 is an image frame memory, and 1
3a is shown as a mask image memory, and 13b is shown as a live image memory. Also, 14 is a subtracter, 15 is an emphasiser, 1
6 is a D/A converter, and 17 is a TV monitor.

第1図の従来例では、造影剤到来前後のX線ば〈射によ
る撮像管10の出力ビデオ信号は、ログ変換器11を経
て、A/D変換器12によりディジタル化され、図示し
ないタイミングスイッチ動作により、メモリ13a、1
3bにそれぞれマスク像、ライブ像の各データが蓄えら
れ、両者の内容は減算器14により減算された後に、差
分画像の濃淡調節のため強調器15により強調され、D
/A変換器16を介してTVモニタ17により表示され
、或いは図示しない記録器により記録される。
In the conventional example shown in FIG. 1, the output video signal of the image pickup tube 10 due to X-ray radiation before and after the arrival of the contrast agent passes through the log converter 11, is digitized by the A/D converter 12, and is digitized by a timing switch (not shown). Due to the operation, memories 13a, 1
Each data of the mask image and the live image is stored in D 3b, and after the contents of both are subtracted by a subtracter 14, they are emphasized by an emphasizer 15 to adjust the density of the difference image.
The signal is displayed on the TV monitor 17 via the /A converter 16, or recorded by a recorder (not shown).

第2図に示す本発明の実施例では、23は造影剤到来前
の画像フレームメモリ、つ寸りマスク像フレームメモリ
である。造影剤到来前の画像は、スイッチ27がa側端
子に接続することにより、一定電圧源26がA/D変換
器22の参考電圧として入力され、これによりディジタ
ル化されて、メモリ23にマスク像として蓄積される。
In the embodiment of the present invention shown in FIG. 2, reference numeral 23 is an image frame memory before the contrast agent arrives, and a mask image frame memory. By connecting the switch 27 to the a-side terminal, the constant voltage source 26 is input as a reference voltage to the A/D converter 22, and the image before the arrival of the contrast agent is digitized and stored as a mask image in the memory 23. It is accumulated as

造影剤到来後は、スイッチ27はb側端子に切換えられ
、メモリ23の内容が読出され、D/A変換器24によ
り変換されたアナログ値がアンプ25を介してA/D変
換器22の参考電圧として入力される。この場合、メモ
リ23の内容読出しは、撮像管10の出力画像の各画素
アドレスと一致するように、アドレスカウンタなどアド
レス コントローラによりタイミングよく行なわれる0 ここで、被検体の吸収係数を、造影剤到来前は、μ(x
、y)とし、その到来後は、 μ(x、y)+Δμ(x、 y)とすると、造影剤到来
前の画像■。は、IO=ae ” ”・Y)造影剤到来
後の画像■1は、I+ +=ae−μfx、y)−ts
μ(x、 y)となり、なおaは定数である0従って、
造影剤到来後のディジタル値lは、 N:A/D変換器22のビット数 β:アンプ25のゲイン となる。
After the contrast medium arrives, the switch 27 is switched to the b side terminal, the contents of the memory 23 are read out, and the analog value converted by the D/A converter 24 is sent to the A/D converter 22 as a reference via the amplifier 25. Input as voltage. In this case, the contents of the memory 23 are read out in a well-timed manner by an address controller such as an address counter so as to match each pixel address of the output image of the image pickup tube 10. Before, μ(x
, y), and after its arrival, μ(x, y) + Δμ(x, y), then the image before the arrival of the contrast agent is ■. is IO=ae ” ”・Y) Image after the arrival of the contrast medium■1 is I+ +=ae-μfx, y)-ts
μ(x, y), where a is a constant 0. Therefore,
The digital value l after the arrival of the contrast medium is: N: number of bits of the A/D converter 22 β: gain of the amplifier 25.

■式によると、本発明では、実質的に割算が実行されて
おり、従って、従来例では必要であったログ変換器11
、減算器14が省かれる。′また、A/D変換器の入力
レンジによる制限がな−ことも明らかである。
According to the equation (2), in the present invention, division is substantially performed, and therefore, the log converter 11, which was necessary in the conventional example,
, the subtractor 14 is omitted. 'It is also clear that there is no limitation due to the input range of the A/D converter.

また、本発明によれば、造影剤注入後、その到来までに
被検体の動きによるモーション アーチファクト(偽像
)は、画像フI/−ムメモリ23に1フレーム以前の画
像データが書き変えられるので、少なくなり、重ね写し
のない画像が表示されるという効果も奏せられる。
Furthermore, according to the present invention, motion artifacts (false images) due to the movement of the subject after the contrast agent is injected and before the arrival of the contrast agent are rewritten in the image frame memory 23 with the image data of one frame earlier. This also provides the effect of displaying images without overlapping images.

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

第1図は従来例のブロック図、第2図は本発明の一実施
例を示すブロック図である。 22はA/D変換器、23は画像フレームメモリ、24
はD/A変換器、25はアンプ、26は電源1,27は
スイッチである。 特許出願人 株式会社 島津製作所 代理人 弁理士 池 田定夫
FIG. 1 is a block diagram of a conventional example, and FIG. 2 is a block diagram showing an embodiment of the present invention. 22 is an A/D converter, 23 is an image frame memory, 24
is a D/A converter, 25 is an amplifier, 26 is a power supply 1, and 27 is a switch. Patent applicant Shimadzu Corporation Representative Patent attorney Sadao Ikeda

Claims (1)

【特許請求の範囲】[Claims] X線信号のディジタル化処理において、A/D変換器の
出力データが画像強調器に送られると共に、画像フレー
ムメモリ、D/A変換器、アンプ及びスイッチを介して
フィードバックして、該A/D変イツイツチ定電圧源と
切換え可能に接続されていることを特徴とする、X線画
像処理装置。
In the digitization process of X-ray signals, the output data of the A/D converter is sent to the image intensifier, and is fed back via the image frame memory, D/A converter, amplifier and switch, and the A/D converter output data is sent to the image intensifier. An X-ray image processing device, characterized in that it is switchably connected to a variable constant voltage source.
JP57181954A 1982-10-15 1982-10-15 Processor of x-ray picture Pending JPS5970386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57181954A JPS5970386A (en) 1982-10-15 1982-10-15 Processor of x-ray picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57181954A JPS5970386A (en) 1982-10-15 1982-10-15 Processor of x-ray picture

Publications (1)

Publication Number Publication Date
JPS5970386A true JPS5970386A (en) 1984-04-20

Family

ID=16109772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57181954A Pending JPS5970386A (en) 1982-10-15 1982-10-15 Processor of x-ray picture

Country Status (1)

Country Link
JP (1) JPS5970386A (en)

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