A parallel imaging technique using mutual calibration for split-blade diffusion-weighted PROPELLER
✍ Scribed by Zhiqiang Li; James G. Pipe; Eric Aboussouan; John P. Karis; Donglai Huo
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 565 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
Split‐blade diffusion‐weighted periodically rotated overlapping parallel lines with enhanced reconstruction (DW‐PROPELLER) was proposed to address the issues associated with diffusion‐weighted echo planar imaging such as geometric distortion and difficulty in high‐resolution imaging. The major drawbacks with DW‐PROPELLER are its high SAR (especially at 3T) and violation of the Carr‐Purcell‐Meiboom‐Gill condition, which leads to a long scan time and narrow blade. Parallel imaging can reduce scan time and increase blade width; however, it is very challenging to apply standard k‐space‐based techniques such as GeneRalized Autocalibrating Partially Parallel Acquisitions (GRAPPA) to split‐blade DW‐PROPELLER due to its narrow blade. In this work, a new calibration scheme is proposed for k‐space‐based parallel imaging method without the need of additional calibration data, which results in a wider, more stable blade. The in vivo results show that this technique is very promising. Magn Reson Med, 2011. © 2010 Wiley‐Liss, Inc.