[Digital function angiography. A method of measuring arterial blood flow]

Digital image processing techniques can be effectively used for the quantitative evaluation of angiograms. In this study, the principle of parameter extraction from digitized image series was utilized. The procedure of parametric analysis was based on mathematical calculations of density-time-curves of the contrast medium according to each picture element of a digital image matrix (256 x 256 picture elements). Flow measurements were calculated from time parameter data and the subsequent segmentation of vessels indicating the propagation of the contrast medium within given time intervals. Flow velocity and volume flow studies will provide additional quantitative information to the evaluation of conventional angiograms.