of Fat Suppression Methods for Functional and Diffusion Studies Using SE EPI
Dimo Ivanov1, Markus Streicher1,
Andreas Schfer1, Robert Turner1
1Department of Neurophysics, Max Planck
Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
increased SNR of ultra-high-field MR scanners allows high resolution
functional and diffusion studies to be performed. Because chemical-shift
artifact suppression is essential for SE EPI
images, we evaluated the performance of different fat suppression techniques.
Conventional methods using additional radiofrequency (RF) and gradient pulses
provide suboptimal results owing to increased B0 and B1 inhomogeneity at higher
fields. They also increase RF power deposition. A recently developed method
using different slice-select gradient strengths during the excitation and
refocussing pulses was demonstrated to be most robust, and delivered best
chemical shift selection.