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Abstract #1530

Optimization of Insert Gradient Coils for Highly Localized Diffusion-Weighting

Rebecca E. Feldman1, William Handler2, Blaine A. Chronik2

1Medical Biophysics, University of Western Ontario, London, Ontario, Canada; 2Physics and Astronomy, University of Western Ontario, London, Ontario, Canada

Localized gradients can deliver high gradient strengths and slew rates due to both increased gradient efficiency and elevated nerve stimulation thresholds. Gradients in diffusion-weighted imaging play two distinct roles. A gradient with a large linear range is required for imaging. However, for the diffusion weighting the gradient is only required to be strong. This abstract details the optimization for a diffusion-only gradient intended to be used as a fourth axis in addition to the three standard whole-body imaging gradients. Non-cylindrical and planar designs are considered. Using non-traditional designs, and a relaxed linearity constraint, exceptionally strong gradients can be designed.