Jonathan B Martin1, Christopher E Vaughn1, Mark A Griswold2, and William A Grissom1
1Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, 2Radiology, Case Western Reserve University, Cleveland, OH, United States
1Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, 2Radiology, Case Western Reserve University, Cleveland, OH, United States
A new class of |B1+|-selective pulses is introduced which utilize the Bloch-Siegert shift to localize selective excitation of magnetization. The pulse's selective abilities are verified in simulation and on a scanner.
a) Conventional B0-gradient-localized selective excitation versus b) our proposed paradigm for |B1+|-selective excitation localized by the Bloch-Siegert shift. The quadratic relationship between frequency and |B1+| is determined by the off-resonance of the Bloch-Siegert pulse, while the range of |B1+| excited is determined by the frequency content of the superimposed excitation pulse.
Predicted and experimental results for the small-tip excitation pulse and its shifted version. The experimental passbands match the simulated, designed passbands well.
