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Abstract #2711

AC Resistance Predictions Vs Experimentally Measured Values for a High Performance Head Gradient Coil

Silke M. Lechner-Greite1, Jean-Baptiste Mathieu2, Seung-Kyun Lee3, Bruce C. Amm4, Thomas K. Foo3, John F. Schenck3, Matthew A. Bernstein5, John Huston5

1Diagnostics and Biomedical Technologies Europe, GE Global Research Europe, Garching n. Munich, Germany; 2Electromagnetics and Superconductivity Laboratory, GE Global Research, Niskayuna, NY, United States; 3Magnetic Resonance Imaging Laboratory, GE Global Research, Niskayuna, NY, United States; 4Biomedical and Electronic Systems Laboratory, GE Global Research, Niskayuna, NY, United States; 5Dept of Radiology, Mayo Clinic, Rochester, MN, United States

We report on AC resistance predictions and measurements of a head-only shielded gradient coil prototype consisting of asymmetric transverse gradients and a symmetric axial gradient. The AC resistances were simulated with finite element method software and measured experimentally on the available prototype of the head gradient. The simulations predicted the AC losses for individual gradient coil excitation with reasonable accuracy for X and Y.

Keywords

accuracy acknowledgment additional amplitude audience axes axis biomedical board boarded body bore capability clinic coil coils comparing compensate conclude conducting contained cost criteria critical cross dedicated describe design designs development diameter direct domain dynamic eddy electronic element elements ensure especially excitation experiment experimentally extracted finite focus footprint forces frequency future global good gradient gradients grant guidance head improve inaccuracies include individual individually induced influence inner inside interaction john laboratory larger latter layers lead linearity listed localized loop loss losses management manufactured maxwell mayo measured mechanical memory mesh minimizing model modeled models must next normalized ohmic ohms outer patient peak performance pictures predict predicted prediction predictions previously prototype proximity pulsing radiology reasonable recent reduced relatively reported resistance resistances safety settings shape shunt simulated simulation simulations sinusoidal slew software step steps subsystem superconductivity support supported sweep symmetry system table target terminal terms thermal tools transfer transverse validated verifying voltages wave whole wire wired