作者
Benjamin C Tendler, Sean Foxley, Moises Hernandez-Fernandez, Michiel Cottaar, Connor Scott, Olaf Ansorge, Karla L Miller, Saad Jbabdi
发表日期
2020/10/15
期刊
NeuroImage
卷号
220
页码范围
117113
出版商
Academic Press
简介
Diffusion-weighted steady-state free precession (DW-SSFP) is an SNR-efficient diffusion imaging method. The improved SNR and resolution available at ultra-high field has motivated its use at 7T. However, these data tend to have severe B1 inhomogeneity, leading not only to spatially varying SNR, but also to spatially varying diffusivity estimates, confounding comparisons both between and within datasets. This study proposes the acquisition of DW-SSFP data at two-flip angles in combination with explicit modelling of non-Gaussian diffusion to address B1 inhomogeneity at 7T. Data were acquired from five fixed whole human post-mortem brains with a pair of flip angles that jointly optimize the diffusion contrast-to-noise (CNR) across the brain. We compared one- and two-flip angle DW-SSFP data using a tensor model that incorporates the full DW-SSFP Buxton signal, in addition to tractography performed over the …
引用总数
2020202120222023202411411