Kosuke Ito1, Masahiro Takizawa1, Tetsuhiko Takahashi1
1MRI system division, Hitachi Medical corporation, Kashiwa, Chiba, Japan
A new fast B1 mapping method (multi Td method) has developed. 3 images are used to calculate B1 maps in this method, images acquired without pre-pulse, and images acquired at two different delay times (Td1 and Td2) from pre-pulse. The scan time is short due to the use of single shot scan. No approximation about T1 relaxation is needed, and the dynamic range of B1 map calculation is wide. Scan time is only 980 ms per slice.