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Abstract #3752

Numerical Evaluation of the Specific Absorption Rate Change of Transmit Arrays at 9.4T due to Presence of B0 Field Probes

Egor Berezko1, Georgiy Solomakha1, Nikolai Avdievich1, Jonas Bause1, Tobias Lindig2, and Klaus Scheffler1,3
1High-field MR Center, Max Planck Institute for Biological Cybernetics, Tuebingen, Germany, 2Department of Diagnostic and Interventional Neuroradiology, University Hospital Tuebingen, Tuebingen, Germany, 3Department of Biomedical Magnetic Resonance, University of Tübingen, Tuebingen, Germany

Synopsis

Keywords: Safety, Safety, Electroencephalography (EEG)

Motivation: Imperfections of B0-field can reduce the MR image quality. To track the B0 change during imaging, NMR field-probes inside the RF coil can be used. Insertion of the field-probes may lead to alteration of the B1+ and pSAR.

Goal(s): To evaluate alterations of B1+ field and pSAR of the 16-channel Tx-array in the presence of NMR field-probes at 9.4T.

Approach: To reach the goal, we simulated the Tx-part of the 16Tx32Rx array loaded by a phantom and human voxel model in the presence of 11 field-probes.

Results: Insertion of field-probes led to a small drop of B1+ and a slight change of pSAR.

Impact: We showed that inserting field-probes doesn’t significantly alter the B1+ field and pSAR of the 16Tx32Rx array coil at 9.4T. Therefore, field-probes can be safely used in-vivo to evaluate B0.

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