High speed bolus tagging: time resolved velocity quantification of pulsatile flow in a single breath hold

Abstract

We have implemented a high speed method for cardiac‐trig gered blood velocity quantification within a single breath hold on a conventional MR system. The method, based on bolus tagging, was tested using a pulsatile flow phantom and evaluated in vivo. The image acquisition time was reduced by a factor of N by acquiring N phase encode lines per bolus tag application. The clarity of the flow tag was found to vary with how k‐space was covered during data collection. The technique was optimized and multiple bolus tag images were obtained throughout the cardiac cycle within a single breath‐hold. Copyright © 1994 Wiley‐Liss, Inc., A Wiley Company