METHOD FOR PIXEL SHIFT CALCULATION IN DIGITAL SUBTRACTION ANGIOGRAPHY AND X-RAY DIAGNOSTIC IMAGING SYSTEM FOR GENERATING IMAGES IN DIGITAL SUBTRACTION ANGIOGRAPHY

摘要

The invention relates to an X-ray diagnostic imaging system for generating images in digital subtraction angiography and a method carried out therewith, comprising the following steps:accessing a mask image frame of a patient under examination;accessing a series of live image frames of the patient under examination acquired in the same imaging position of the mask frame acquisition, wherein one of the mask image frame and the live image frames is contrast-enhanced;assuming possible shift vectors in a region of interest and calculating a scoring thereof, each possible shift vector being a difference vector between the mask image frame and a respective live image frame,determining the possible shift vector with the highest scoring and choosing it as an elected shift vector,calculating a likelihood p representing a quality value of the elected shift vector,shifting the mask image frame with respect to the respective live image frame by a modified shift vector depending on the likelihood p,subtracting the shifted mask image frame from the respective live image frame, anddisplaying the respective subtracted image frame.