Joint design of trajectory and RF pulses for parallel excitation

We propose an alternating optimization framework for the joint design of excitation k‐space trajectory and RF pulses for small‐tip‐angle parallel excitation. Using Bloch simulations, we show that compared with conventional designs with predetermined trajectories, joint designs can often excite targe...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2007-09, Vol.58 (3), p.598-604
Main Authors: Yip, Chun-Yu, Grissom, William A., Fessler, Jeffrey A., Noll, Douglas C.
Format: Article
Language:English
Subjects:
Algorithms
alternating optimization
Echo-Planar Imaging - methods
Humans
Image Enhancement - methods
Image Processing, Computer-Assisted - methods
joint design
Magnetic Resonance Imaging - methods
Models, Theoretical
parallel excitation
pulse design
trajectory design
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Summary:We propose an alternating optimization framework for the joint design of excitation k‐space trajectory and RF pulses for small‐tip‐angle parallel excitation. Using Bloch simulations, we show that compared with conventional designs with predetermined trajectories, joint designs can often excite target patterns with improved accuracy and reduced total integrated pulse power, particularly at high reduction factors. These benefits come at a modest increase in computational time. Magn Reson Med 58:598–604, 2007. © 2007 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.21262