Premium
PROPELLER EPI: An MRI technique suitable for diffusion tensor imaging at high field strength with reduced geometric distortions
Author(s) -
Wang FuNien,
Huang TengYi,
Lin FaHsuan,
Chuang TzuChao,
Chen NanKuei,
Chung HsiaoWen,
Chen ChengYu,
Kwong Kenneth K.
Publication year - 2005
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.20677
Subject(s) - propeller , diffusion mri , nuclear magnetic resonance , signal (programming language) , physics , specific absorption rate , magnetic resonance imaging , signal to noise ratio (imaging) , sensitivity (control systems) , computer science , optics , geology , medicine , electronic engineering , telecommunications , radiology , oceanography , engineering , antenna (radio) , programming language
A technique suitable for diffusion tensor imaging (DTI) at high field strengths is presented in this work. The method is based on a periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) k ‐space trajectory using EPI as the signal readout module, and hence is dubbed PROPELLER EPI. The implementation of PROPELLER EPI included a series of correction schemes to reduce possible errors associated with the intrinsically higher sensitivity of EPI to off‐resonance effects. Experimental results on a 3.0 Tesla MR system showed that the PROPELLER EPI images exhibit substantially reduced geometric distortions compared with single‐shot EPI, at a much lower RF specific absorption rate (SAR) than the original version of the PROPELLER fast spin‐echo (FSE) technique. For DTI, the self‐navigated phase‐correction capability of the PROPELLER EPI sequence was shown to be effective for in vivo imaging. A higher signal‐to‐noise ratio (SNR) compared to single‐shot EPI at an identical total scan time was achieved, which is advantageous for routine DTI applications in clinical practice. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc.