Abstract #2686

Reduction of image artifacts in non-contrast-enhanced velocity-selective peripheral MRA at 3T

Taehoon Shin¹, Qin Qin², Jang-Yeon Park^3,4, Robert S. Crawford⁵, and Sanjay Rajagopalan⁶

¹Diagnostic radioloy and nuclear medicine, University of Maryland, Baltimore, MD, United States, ²Radiology, Johns Hopkins University, Baltimore, MD, United States, ³Biomedical Engineering, Sungkyunkwan University, Suwon, Korea, Republic of, ⁴Center for neuroscience imaging research, Insititute for Basic Science, Suwon, Korea, Republic of, ⁵Vascular and endovascular surgery, University of Maryland, Baltimore, MD, United States, ⁶Cardiovascular Medicine, University of Maryland, Baltimore, MD, United States

Velocity-selective (VS) magnetization-prepared non-contrast-enhanced MR angiography has advantages of large 3D FOV, arbitrary 3D spatial resolution and need for single acquisition only. Peripheral VS-MRA has shown great potential at 1.5T but might be challenging at 3T due to large B0 and B1 inhomogeneity in the pelvis and legs. In this study, we show that the effects of B0 and B1 offsets are manifested as arterial signal loss, stripe artifact and background signal variation. We develop multiple-refocused VS excitation pulses and propose successive applications of two VS preparation pulses with shifted excitation profiles to suppress these artifacts.

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