PROPELLER Magnetic Resonance Echo Planar Imaging
Date Issued
2005
Date
2005
Author(s)
Wang, Fu-Nien
DOI
en-US
Abstract
A technique suitable for diffusion tensor imaging at high field strengths is presented in this thesis. The method is based on PROPELLER k-space trajectory using EPI as the signal readout module, hence 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 than the original version of PROPELLER fast spin-echo technique. For diffusion tensor imaging, the self-navigated phase correction capability of the PROPELLER EPI sequence was shown to be effective for in vivo imaging. The reduced data acquisition window also allows more signal averages to be performed to achieve higher signal-to-noise ratio when compared with single-shot EPI at identical total scan time, an advantage beneficial for routine diffusion tensor imaging applications in clinical practice.
Subjects
螺旋槳式影像
平面回訊影像
幾何失真
特定射頻吸收率
擴散張量影像
Propeller imaging
EPI
geometric distortions
specific absorption rate
diffusion tensor imaging
Type
thesis
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