期刊
MAGNETIC RESONANCE IMAGING
卷 26, 期 10, 页码 1406-1414出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2008.04.008
关键词
Segmented echo-planar imaging; Iterative phase correction; Center-out k-space trajectory; GDC-SEPI
资金
- NIH [2R01 HL062983]
- State of Michigan [085P5200251]
- NATIONAL CANCER INSTITUTE [P30CA022453] Funding Source: NIH RePORTER
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL062983] Funding Source: NIH RePORTER
In this article, we present a modified interleaved segmented echo-planar imaging (SEPI) sequence with a center-out k-space trajectory that is especially designed for susceptibility-weighted imaging applications. We introduce a simple and efficient technique to phase correct the acquired SEPI data in the presence of moderate field inhomogeneitics. This phase correction reduces the distortion in the phase-encoding direction without requiring an extra reference scan. With the use of a center-out k-space trajectory and a low-spatial-frequency phase map, phase discontinuities between segments can be eliminated, in principle, iteratively using a fast Fourier transform from the center segment to the outermost segment in k-space. With an extra echo added in front of the echo train, neither phase unwrapping nor an extra reference scan is required to obtain a low-spatial-frequency phase map. The method is shown to remove blurring and reduce geometric distortion caused by phase changes from echo to echo in both phantom and human data. The method is most useful for high-resolution imaging applications and moderate factors of speed improvement. (C) 2008 Elsevier Inc. All rights reserved.
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