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Abstract #1320

Safety Evaluation of a 16-element 9.4T Human Head Transmit Array with B0 Field Probes Inserted

Egor Berezko1, Georgiy Solomakha1, Nikolai Avdievich1, Felix Glang1, Dario Bosch1,2, Jonas Bause1, Tobias Lindig3, and Klaus Scheffler1,2
1Max Planck Institute for Biological Cybernetics, Tuebingen, Germany, 2Department for Biomedical Magnetic Resonance, University of Tübingen, Tuebingen, Germany, 3Department of Diagnostic and Interventional Neuroradiology, University Hospital Tuebingen, Tuebingen, Germany

Synopsis

Keywords: Safety, Safety, NMR Field Probes

Motivation: Combining RF-array with B0 field-probes provides capability of controlling quality of the image. However, presence of additional devices can lead to an increased local heating and inhomogeneities of magnetic field (B1+).

Goal(s): To evaluate RF-safety of the 16Tx-array in the presence of multiple B0 field-probes.

Approach: We numerically and experimentally evaluate the transmit performance of the 16Tx-array loaded by a phantom and human voxel models in the presence of 11 B0 field-probes.

Results: Inserting the field-probes led to a change up to 18% for the worst-case (WC) pSAR10g and decrease of simulated B1+ up to 24% and experimental in 25%.

Impact: We showed that insertion of B0 field-probes does not substantially change the peak SAR and the RF magnetic field distribution of the 16Tx array at 9.4T. Predicted SAR changes facilitate safe use of the field-probes for in-vivo studies.

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