A Hybrid Computerized Fluoroscopy Technique for Noninvasive Cardiovascular Imaging

Abstract

The excellent linearity of digital image storage and retrieval permits hybrid analog-digital subtraction to extend the spatial resolution of 2 previously developed algorithms which employed entirely digital apparatus. A low resolution, time-integrated preinjection digital mask image is reconverted to analog form and subtracted from live analog video images of I administered by peripheral i.v. injection to produce a high resolution display of the cardiovascular system with contrast 10 times greater than conventionl fluoroscopy. Preliminary studies in dogs are compared to images obtained with digital subtraction algorithms.