Xiaoying Cai1, Wu Dan2, Jiangyang Zhang3
1Biomedical Engineering, Tsinghua University, Beijing, China; 2Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, United States; 3Radiology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
We propose the use of a twin-navigator phase correction scheme to monitor and correct phase errors in fast spin echo Bloch-Siegert B1 mapping sequences. The proposed sequence was implemented and tested on an 11.7T MR system. With phase correction, both individual phase images and calculated B1 maps contained fewer artifacts. The technique can be used to acquire 3D B1 map on high field magnet and tolerate certain degree of subject motion and instrument instability.