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Abstract #1835

Impact of Gradient Nonlinearity on the Accuracy of NMR Field Camera Readouts

Paul Chang 1,2 , Martin Eschelbach 1 , Roland Syha 3 , Klaus Scheffler 1 , and Anke Henning 1,4

1 Max Planck Institute for Biological Cybernetics, Tuebingen, Baden-Wuerttemberg, Germany, 2 Graduate School of Neural & Behavioural Sciences, University of Tuebingen, Tuebingen, Baden-Wuerttemberg, Germany, 3 Diagnostic and Interventional Radiology, University Hospital Tuebingen, Tuebingen, Baden-Wuerttemberg, Germany, 4 Institute for Biomedical Engineering, UZH and ETH Zurich, Zurich, Switzerland

Field monitoring using NMR field cameras typically use the gradients for calculating the positions of the field probes. However this is under the assumption that the gradients are linear which is certainly not the case. The effect of evaluated gradient imperfections on the estimation of the probes was investigated. Furthermore, the effect of the position error on monitoring higher order spherical harmonics was also investigated. A CT scan of the field camera setup was used to correct for errors in the calculations of the probe position.

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