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뇌과학이미징연구단
뇌과학 이미징 연구단
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High slew-rate head-only gradient for improving distortion in echo planar imaging: Preliminary experience

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Title
High slew-rate head-only gradient for improving distortion in echo planar imaging: Preliminary experience
Author(s)
Tan, ET; Seung-Kyun Lee; Weavers, PT; Graziani, D; Piel, JE; Shu, YH; Huston, J; Bernstein, MA; Foo, TKF
Publication Date
2016-09
Journal
JOURNAL OF MAGNETIC RESONANCE IMAGING, v.44, no.3, pp.653 - 664
Publisher
WILEY-BLACKWELL
Abstract
PurposeTo investigate the effects on echo planar imaging (EPI) distortion of using high gradient slew rates (SR) of up to 700T/m/s for in vivo human brain imaging, with a dedicated, head-only gradient coil. Materials and MethodsSimulation studies were first performed to determine the expected echo spacing and distortion reduction in EPI. A head gradient of 42-cm inner diameter and with asymmetric transverse coils was then installed in a whole-body, conventional 3T magnetic resonance imaging (MRI) system. Human subject imaging was performed on five subjects to determine the effects of EPI on echo spacing and signal dropout at various gradient slew rates. The feasibility of whole-brain imaging at 1.5mm-isotropic spatial resolution was demonstrated with gradient-echo and spin-echo diffusion-weighted EPI. ResultsAs compared to a whole-body gradient coil, the EPI echo spacing in the head-only gradient coil was reduced by 48%. Simulation and in vivo results, respectively, showed up to 25-26% and 19% improvement in signal dropout. Whole-brain imaging with EPI at 1.5mm spatial resolution provided good whole-brain coverage, spatial linearity, and low spatial distortion effects. ConclusionOur results of human brain imaging with EPI using the compact head gradient coil at slew rates higher than in conventional whole-body MR systems demonstrate substantially improved image distortion, and point to a potential for benefits to non-EPI pulse sequences. (C) 2016 International Society for Magnetic Resonance in Medicine
URI
https://pr.ibs.re.kr/handle/8788114/2979
ISSN
1053-1807
Appears in Collections:
Center for Neuroscience Imaging Research (뇌과학 이미징 연구단) > Journal Papers (저널논문)
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