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Abstract #4932

Segmented TOF MRA with Reduced Venous Saturation Pulses to Decrease SAR at 3T and 7T

Zihao Zhang 1,2 , Dehe Weng 3 , Jing An 3 , Bo Wang 1 , Yan Zhuo 1 , Xiaohong Joe Zhou 4 , and Rong Xue 1

1 State Key Lab of Brain and Cognitive Science, Beijing MR Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, Beijing, China, 2 Graduate School, University of Chinese Academy of Sciences, Beijing, Beijing, China, 3 Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, Guangdong, China, 4 Dept. of Radiology, Center for MR Research, University of Illinois, Chicago, Illinois, United States

Time-Of-Flight (TOF) MR angiography has exhibited considerable advantages at very-high and ultra-high magnetic fields. However, the tracking saturation pulse to suppress venous signals in TOF is commonly omitted at 7T to stay within the SAR limit, leading to venous contamination in MIP angiograms. This study reduces the duty cycle of saturation pulse by introducing segmented TOF. Comparing with the conventional TOF sequence, the new sequence reduces the total number of saturation pulses and the SAR values considerably. As a result, the advantages of 3T and 7T MR angiography are better realized to improve the angiogram quality.

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