Peter Stijnman1,2, Arcan Erturk3, Cornelis van den Berg1, and Alexander Raaijmakers1,2
1Computational Imaging, UMC Utrecht, Utrecht, Netherlands, 2Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands, 3Medtronic, Minneapolis, MN, United States
1Computational Imaging, UMC Utrecht, Utrecht, Netherlands, 2Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands, 3Medtronic, Minneapolis, MN, United States
We performed a TF measurement and validation study using a new validation method. Simulated incident electric fields of local transmit coils and the measured TF were used to predict tip heating, verified by temperature probe measurements showing excellent agreement ($$$R^2\geq0.977$$$).
A.) shows the measured temperature at the tip of the lead. Only the measurements done with the smaller loop coil are shown, a similar set of measurements were done with a larger loop coil. The slope of the temperature increase at the start of each separate heating test is used to obtain the (measured) SAR at the temperature probe for that specific heating test. The (predicted) SAR that is calculated using the transfer function and the known exposure condition is correlated with the measured SAR showing good agreement for all three leads.
A comparison between the transfer functions obtained with FDTD simulations and the transfer function obtained with MRI measurements are shown. The left plot shows the normalized magnitude of the TF and the right plot shows the phase of the TF.