Digital subtraction system

Abstract

Abstract PURPOSE:To attain simultaneous observation by storing a peak value of differential images obtained sequentially to display superimposingly an image when a contrast medium is being moved on one picture. CONSTITUTION:A transmitted image by X-rays directed from an X-ray tube 11 to an object 12 is converted into a video signal by an X-ray image intensifier 13, an image pickup tube 14 and a camera control unit 15. The video signal is transmitted to an arithmetic unit 23 via a logarithmic converter 21 and an A/D converter 22. A picture before a contrast medium is applied is stored in a frame memory 24 as a mask image and a live image after application of the contrast medium is stored in a frame memory 25. When the subtraction from the live image to the mask image is performed at each corresponding picture element by an arithmetic unit 23, the picture of the contrast medium only remains as a differential image and the image is displayed on a monitor TV16.

Inventors

• 👤 Hiroyuki Nishioka
• 👤 西岡　弘之

Bibliographic Details