Abstract #2797
Reduced Blurring in Diffusion-Weighted EPI using a Dual-Shot, Reverse-Gradient Sequence with Asymmetric k-space Splicing and Inherent Distortion Correction
Wei Liu 1 , Kun Zhou 1 , and David A. Porter 2
1
Siemens Shenzhen Magnetic Resonance Ltd.,
Shenzhen, Select, China,
2
Fraunhofer
MEVIS, Institute for Medical Image Computing, Bremen,
Germany
In the case of DWI, a common way to reconstruct the
partially sampled dataset is to zero fill the missing
k-space samples. However, this decreases the image
resolution and results in significant blurring in the
phase-encoding direction. In this study, we introduce a
dual-shot DW-EPI sequence, which achieves full k-space
sampling by combining two partially sampled data sets,
acquired with opposite phase-encoding gradient
polarities. The resulting images have reduced image
blurring compared to the standard zero-filled case. In
addition, the method of image combination inherently
incorporates a standard technique for correcting
geometric distortion using the reverse-gradient
approach.
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