Gradient preemphasis calibration in diffusion-weighted echo-planar imaging
Nikolaos G. Papadakis
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Department of Physiology, University of Cambridge, Cambridge, UK
Search for more papers by this authorKay M. Martin
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge, Cambridge, UK
Search for more papers by this authorJohn D. Pickard
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Search for more papers by this authorLaurance D. Hall
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge, Cambridge, UK
Search for more papers by this authorT. Adrian Carpenter
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Search for more papers by this authorCorresponding Author
Christopher L.-H. Huang
Department of Physiology, University of Cambridge, Cambridge, UK
Physiological Laboratory, Downing Street, Cambridge CB2 3EG, UK===Search for more papers by this authorNikolaos G. Papadakis
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Department of Physiology, University of Cambridge, Cambridge, UK
Search for more papers by this authorKay M. Martin
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge, Cambridge, UK
Search for more papers by this authorJohn D. Pickard
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Search for more papers by this authorLaurance D. Hall
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge, Cambridge, UK
Search for more papers by this authorT. Adrian Carpenter
Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK
Search for more papers by this authorCorresponding Author
Christopher L.-H. Huang
Department of Physiology, University of Cambridge, Cambridge, UK
Physiological Laboratory, Downing Street, Cambridge CB2 3EG, UK===Search for more papers by this authorAbstract
This article describes a method which enables fast and objective pulse-sequence-specific preemphasis calibration, using standard pulse sequences and system hardware. The method is based on a k-space measurement technique, and has been applied to single-shot, diffusion-weighted, spin-echo, echo-planar imaging (DW-SE-EPI), which is particularly sensitive to eddy-current-induced image distortions. The efficiency of the technique was demonstrated not only by the reduction of eddy-current fields to a negligible level using full preemphasis compensation, but also by the fact that adjustment of the slow time-base alone sufficed for the practical elimination of image distortions in the DW-SE-EPI images and the subsequent diffusion tensor maps (in a phantom and a human brain). By seeking to eliminate directly the effect of eddy-current-induced phase shifts during the EPI data collection, the method is free of the complications and restrictions associated with other eddy-current correction techniques for DW-SE-EPI (such as acquisition of additional calibration scans, intense postprocessing, extensive pulse-sequence modifications), making their use redundant. Magn Reson Med 44:616–624, 2000. © 2000 Wiley-Liss, Inc.
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