PROPELLER EPI: An MRI technique suitable for diffusion tensor imaging at high field strength with reduced geometric distortions

Fu Nien Wang, Teng Yi Huang, Fa Hsuan Lin, Tzu Chao Chuang, Nan Kuei Chen, Hsiao Wen Chung, Cheng Yu Chen, Kenneth K. Kwong

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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 (SMR) compared to single-shot EPI at an identical total scan time was achieved, which is advantageous for routine DTI applications in clinical practice.

Original languageEnglish
Pages (from-to)1232-1240
Number of pages9
JournalMagnetic Resonance in Medicine
Issue number5
Publication statusPublished - Nov 2005
Externally publishedYes



  • Diffusion tensor imaging
  • EPI
  • Geometric distortions
  • PROPELLER imaging
  • Specific absorption rate

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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