https://scholars.lib.ntu.edu.tw/handle/123456789/316495
標題: | PROPELLER EPI: An MRI technique suitable for diffusion tensor imaging at high field strength with reduced geometric distortions | 作者: | Wang, F.-N. Huang, T.-Y. Lin, F.-H. Chuang, T.-C. Chen, N.-K. Chen, C.-Y. Kwong, K.K. HSIAO-WEN CHUNG |
關鍵字: | Diffusion tensor imaging; EPI; Geometric distortions; PROPELLER imaging; Specific absorption rate | 公開日期: | 2005 | 卷: | 54 | 期: | 5 | 起(迄)頁: | 1232-1240 | 來源出版物: | Magnetic Resonance in Medicine | 摘要: | 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. © 2005 Wiley-Liss, Inc. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-27644579499&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/316495 |
DOI: | 10.1002/mrm.20677 | SDG/關鍵字: | Biomedical signal processing; Clustering algorithms; Diffusion; Geometry; Magnetic resonance imaging; Propellers; Signal to noise ratio; Space flight; Tensors; Clinical practices; Correction schemes; Fast spin echos; Geometric distortion; High field strengths; K-space trajectories; Phase corrections; Specific absorption rate; Diffusion tensor imaging; analytic method; analytical error; article; clinical practice; comparative study; contrast enhancement; diffusion tensor imaging; geometry; image reconstruction; in vivo study; nuclear magnetic resonance imaging; sensitivity and specificity; signal noise ratio |
顯示於: | 生醫電子與資訊學研究所 |
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