1Applied Science Laboratory, GE
Healthcare, San Francisco, CA, United States; 2Radiology and
Biomedical Imaging, University of California, San Francisco, San Francisco,
CA, United States
Compensation
of B1 variations in vivo requires mapping both the magnitude and the phase of
each channel's RF magnetic field. Since the field distribution is strongly
dependent on the specific size, shape, and positioning of the tissue, such
mapping must be made for each subject. We present a practical method for
acquiring these maps within 10 minutes in phantoms and human subjects at 7T.