Comparison of nonenhanced MR angiographic subtraction techniques for infragenual arteries at 1.5 T: a preliminary study.

Satisfactory image quality and excellent negative predictive value were achieved at 1.5-T variable-refocusing-flip angle (FA) and constant-refocusing-FA fast spin-echo-based MR and flow-sensitive dephasing-prepared steady-state free precession MR for below-knee hemodynamically significant stenosis.