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Abstract #3940

Superelliptical Insert Gradient Coil with Field Modifying Layers for Breast MRI

Sung M. Moon1, K. Craig Goodrich1, J. Rock Hadley1, Gengsheng Lawrence Zeng1, Glen Morrell1, Matthew A. McAlpine2, Blaine A. Chronik2, Dennis L. Parker1

1UCAIR (Utah Center for Advanced Imaging Research), Radiology, University of Utah, Salt Lake City, UT, United States; 2Physics and Astronomy, University of Western Ontario, London, Ontario, Canada

With higher gradient strength and slew rate, planar insert gradients can attain higher spatial and temporal resolution than the body gradients. However, a homogeneous gradient volume of the planar gradient is relatively small due to its inherent geometry and exponential field fall-off with distance from the coil surface. Therefore, the HGV may be too small for breast imaging. In this work, to create wider HGV, the planar geometry was widened and the edges were bent vertically using superelliptical curvature on both sides, creating a so-called superellipse shape to fit in the magnet bore. These vertical edges increase the uniformity. Furthermore, an extra outer layer of current windings was added to increase its strength and homogeneity.