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Abstract #2717

Matrix Shimming for Whole Body Gradient Coils

Derek A. Seeber1, Kevin Koch2, Bernardo Ortega3

1Engineering, GE Healthcare, Florence, SC, United States; 2ASL, GE Healthcare, Waukesha, WI, United States; 3Engineering, GE Healthcare, Apodaca, NL, Mexico

A matrix array shim coil system was designed to be included into a widebore gradient coil consisting of 24 channels in a 6 circumferential by 4 axial coil matrix array. The matrix shim coil is designed from multi-layer Kapton circuit boards and is integrated into a gradient coil between the inner and outer gradient coil. Simulations from brain images were analyzed and demonstrate improved performance over a traditional 3rd order harmonic shim set.

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Keywords

addition amps around array axis best board boards body bore brain build capability capable cavity channel channels circuit circumference clinical coil coils composed computer concepts configuration configured constructed cooling correct correction corrections crossing crossover demonstrating design designed determine determined dimension dimensions drivers dynamic enabling engineering entire equivalent especially executed field formed forming fraction gauss generate generated generates gradient green half harmonic harmonics homogeneity human immediately important improve improved independent individual inner integrated integration interaction interactions journal layer linear localized magnet matrix minimize modeling near offer optimal outer outlined part performance permit placed potential power produced quality radial radius reduce reduced reduces require required requirements requires requiring resistive resolution rows seeking shape shim shimming simulate simulations sinus slice slices smaller solution space spectral spherical stability static strength superior supply system temperature terms tool tradition traditional whole wide width