[논문]Single‐shot pseudo‐centric EPI for magnetization‐prepared imaging

Lee, Hyun‐; Soo; Hwang, Seon‐; Ha; Park, Jaeseok; Park, Sung‐; Hong

doi:10.1002/mrm.28897

[해외논문] Single‐shot pseudo‐centric EPI for magnetization‐prepared imaging

Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine, v.86 no.5, 2021년, pp.2656 - 2665

Lee, Hyun‐Soo (MRI Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea) , Hwang, Seon‐Ha (MRI Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea) , Park, Jaeseok (Department of Biomedical Engineering, Sungkyunkwan University, Suwon, Korea) , Park, Sung‐Hong (MRI Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea)

Abstract ▼ AI-Helper

PurposeTo implement a single‐shot centric‐reordered EPI (1sh‐CenEPI), which reduces TE significantly, thus enabling to improve SNR for magnetization‐prepared imaging.MethodsWe proposed a 1sh‐CenEPI in which grouped oscillating readout gradients, phase‐encoding blips within each group, and big phase‐encoding jumps between two consecutive groups are incorporated to encode whole k‐space from the center to the edges in a single shot. The concept was tested on phantoms and human brains at 3 T. In addition, the proposed reordering scheme was applied to pseudo‐continuous arterial spin labeling for evaluating the efficiency of the centric reordering in magnetization‐prepared imaging.ResultsThe proposed 1sh‐CenEPI reduced TE from 50 ms to 1.4 ms for gradient‐echo EPI, and from 100 ms to 7 ms for spin‐echo EPI, while the elongation of readout duration was below 10% of the whole readout duration in most cases. The 1sh‐CenEPI images exhibited no distinct geometric distortion both in phantom and human brain, comparable to the conventional two‐shot center‐out EPI. In pseudo‐continuous arterial spin labeling results, 3‐fold temporal SNR increase and 2‐fold spatial SNR increase in the perfusion‐weighted images were achieved with 1sh‐CenEPI compared with the conventional linear ordering, whereas the cerebral blood flow values were consistent with previous studies.ConclusionThe proposed 1sh‐CenEPI significantly reduced TE while maintaining similar readout window and providing images comparable to the conventional linear and multishot center‐out EPI images. It can be a qualified candidate as a new readout for various magnetization‐prepared imaging techniques.

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DOI : 10.1002/mrm.28897
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