A system for the positioning correlation between computed tomographs and conventional radiographs.

The authors have presented a special system which enables us to understand the positioning relationship between transverse CT images and conventional radiographs. With this system the image on a X-ray film is first changed into a video image and second, the computed radiograph which has the positioning information for each CT image is superimposed on it electronically. Finally the computed radiograph is eliminated except for the positioning lines of the CT scanning. The image thus obtained is called a "Replaced Computed Radiograph (RCR image)". This image is then changed into a digital image and manipulated in the same manner as its CT images. We have utilized this system for 22 clinical cases and recognized it to be useful for current integrated-radiography.