ECG Gated 3D Single Shot Fast Spin Echo with Variable TR for Non-Contrast Peripheral MR Angiography at 3T

In conventional subtraction based non-contrast ECG gated 3D single shot fast spin echo (SSFSE) technique, each slice encoding and the followed echo train are played in a fixed TR (TR=n*RR). Ideally, TR should be sufficiently long for the recovery of the longitudinal magnetization of blood and background tissue, which led to a long scan time. In this work, a variable TR (vTR) method is proposed to reduce the scan time while still maintain the blood signal. The results showed the vTR method can significantly reduce scan time by 20-40% and had comparable arterial image quality as the fixed TR scan.

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