MULTIBOLUS STIMULATED ECHO IMAGING OF CORONARY-ARTERY FLOW

One limitation of traditional bolus tagging techniques for MR angiogra phy is the small amount of blood labeled by one tagging, resulting in a limited filling of the downstream vessels, We describe a multiple bo lus technique using stimulated echoes (STE) for imaging coronary now. A series of radiofrequency (RF) pairs are given with each pair selecti ve at the region of tagging, thus tagging consecutive volumes of blood , and a final nonselective pulse is given to ''read out'' all of the t agged spins. In this way, multiple boluses of tagged blood are imaged at one time.