Design of spectral-spatial phase prewinding pulses and their use in small-tip fast recovery steady-state imaging.

ABSTRACT:

Purpose

Spectrally selective "prewinding" radiofrequency pulses can counteract B0 inhomogeneity in steady-state sequences, but can only prephase a limited range of off-resonance. We propose spectral-spatial small-tip angle prewinding pulses that increase the off-resonance bandwidth that can be successfully prephased by incorporating spatially tailored excitation patterns.

Theory and methods

We present a feasibility study to compare spectral and spectral-spatial prewinding pulses. These pulses add a prephasing term to the target magnetization pattern that aims to recover an assigned off-resonance bandwidth at the echo time. For spectral-spatial pulses, the design bandwidth is centered at the off-resonance frequency for each spatial location in a field map. We use these pulses

SUBMITTER: Williams SN 

PROVIDER: S-EPMC5752636 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature