Abstract #4277

A parallel transmit VERSE RF pulse design method using dynamic field monitoring

Mustafa Cavusoglu¹, Klaas Paul Pruessmann¹, and Shaihan Malik²

¹Institute of Biomedical Engineering, ETH Zurich, Zurich, Switzerland, ²Kings Collage London, London, United Kingdom

Variable-rate selective excitation (VERSE) is a powerful method to control RF power and SAR that bounds to a key condition as retaining the RF-to-gradient amplitude ratio at each sample that preserves the rotational behavior of on-resonance spins (1). The maintenance of VERSE condition strictly depends on the fidelity of the local gradient fields implying that any deviation from the nominal VERSE’d gradients will modulate the spin rotations similar to off-resonances ultimately resulting excitation errors and the RF pulse to converge to a significantly different peak RF power.

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