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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