Yi-Cheng Hsu1,
Ying-Hua Chu2, Thomas Witzel3, I-Liang Chern4,
Fa-Hsuan Lin2
1Department
of Mathematics, Nnational Taiwan University, Taipei, Taiwan; 2Institute
of Biomedical Engineering, National Taiwan University, Taipei, Taiwan; 3A.
A. Martinos Center, Massachusetts General Hospital, Charlestown, MA, United
States; 4Department of Mathematics, National Taiwan University,
Taipei, Taiwan
To mitigate the B1+ inhomogeneity and to achieve more homogeneous large flip angle in high field MRI, we propose a method of composite excitation pulses, which does not require the refocusing slice selection gradient between two pulses. At 3T MRI, we demonstrate and compare this method to the standard single pulse excitation and a previously reported two-pulse method. We also used the Bloch equation to simulate the magnetization after our two-pulse excitation over a slice FOV to prove that our proposed composite pulses method can also work with slice-selective pulses.
Keywords