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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