Shih Yu Cheng1, Yuan Yu Hsu2, Wan
Chun Kuan3, Mei Yu Yeh1, Kun Eng Lim2, Ho
Ling Liu1,4
1Medical imaging and Radiological
Sciences, Chang Gung University, Taoyuan, Taiwan; 2Medical
Imaging, Buddhist Tzu Chi General Hospital, Taipei, Taiwan; 3Biomedical
Engineering and Environmental Sciences, National Tsing Hua University,
Hsinchu, Taiwan; 4Division of Medical Imaging and Intervention,
Chang Gung Memorial Hospital, Taoyuan, Taiwan
ASL
MRI using gradient-echo EPI suffers from susceptibility artifact in areas
near air/tissue interfaces. Previous
fMRI studies investigated the optimal slice tilt to reduce the signal dropout
in those areas. Besides, parallel
imaging can help by having shorter echo trains which reduces intra-voxel
dephasing. This study focused on the
orbitofrontal cortex region and evaluates the effects of slice angle combined
with parallel imaging on ASL image quality.
The results indicated that using parallel imaging could reduce the
signal dropout caused by dephasing effect of susceptibility related field
gradient. Parallel imaging is also
preferable due to less subject to slice orientation.
Keywords