Guangqi Li1, Xinyu Ye1, Xin Shao1, Xiaodong Ma2, and Hua Guo1
1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, 2Center for Magnetic Resonance Research, Radiology, Medical School, University of Minnesota, Minneapolis, MN, United States
1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, 2Center for Magnetic Resonance Research, Radiology, Medical School, University of Minnesota, Minneapolis, MN, United States
This
study demonstrates that POCS-ICE algorithm has a powerful capability to correct
phase errors and reconstruct DWI images simultaneously for navigator-free
acquisitions. Based on our proposed acquisition strategy, high-resolution DWI can be acquired using a 4-shot spiral
acquisition.
Figure 2: T2-weighted images (b=0) and diffusion-weighted images
(b=1000 s/mm2) acquired by different spiral acquisition schemes. Single-shot
EPI DWI were also shown as a reference. Based on the proposed acquisition
strategy, for 4-shot spiral acquisition, the readout duration was reduced
from 41.0 ms to approximately 30.0 ms. The blurring effects were significantly
reduced, and the image quality was improved.
Figure 3: Colored FA maps of six slices. The results
show that 4-shot spiral variants can provide fine DTI metrics, which
indicates that POCS-ICE algorithm can successfully correct motion-induced phase
errors for these 4-shot spiral variants.
