Zheng Chang1, Qing-San Xiang2,3,
Hao Shen4, Fang-Fang Yin1
1Department of Radiation Oncology, Duke
University, Durham, NC, United States; 2Department of Physics and
Astronomy, University of British Columbia, Vancouver, bc, Canada; 3Department
of Radiology, University of British Columbia, Vancouver, BC, Canada; 4Applied
Science Laboratory, GE Healthcare, Beijing, China
Skipped
Phase Encoding and Edge Deghosting (SPEED) has been demonstrated effective in
accelerating typical MRI. In this work, SPEED is further developed to achieve
higher efficiency in accelerating non-contrast-enhanced MRA with inflow
inversion recovery (IFIR). IFIR employs an inversion recovery pulse to
suppress signals from static tissue, while leaving inflow arterial blood
unaffected, resulting in visible vasculature on modest tissue
background. By taking advantages of
sparsity of vasculature, SPEED with a single-layer-model can achieve higher
efficiency than that achievable with a double-layer-model. The technique is
demonstrated with a 3D renal IFIR study achieving undersmapling factors up to
5.