Patent ID: 6195450
Filing Date: 2001-02-27
Classification: A61B,G01N,H05G

Abstract:
A method for determining when to step an x-ray angiography imaging device relative to a patient, the method comprising the steps of:a) receiving a mask image;b) receiving a sequence of images;c) extracting image features based on the received mask image and the received sequence of images; andd) determining when to step the imaging device relative to the patient based on bolus propagation estimated from the extracted image features;wherein the step of extracting image features comprises the sub-steps of:i) determining at least one of a DSA (digital subtraction angiographic) frame and a DIFF (difference) frame;ii) determining features of the at least one of the DSA frame and the DIFF frame;iii) fitting the determined features of the at least one of the DSA frame and the DIFF frame to a bolus propagation model function to generate fitted model parameters; andiv) determining a bolus propagation state based on the fitted model parameters for estimating the bolus propagation.