Blood Imaging (FBI) scan time can be greatly reduced using variable TR (vTR) technique
for imaging the peripheral artery without contrast. To reduce the SAR in FSE
acquisition so that the shortest TR can be enabled for the slice encodings at
the kz edge, variable refocusing flip angle (vFA) is proposed in addition to
vFA for FBI in this study. The optimized FBI sequence with vTR and vFA was
applied on volunteers to achieve a 7-minutes 3 station run-off scan to cover
from iliac to calf.