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Abstract #3660

Database Construction for Local SAR Prediction: Preliminary Assessment of the Intra and Inter Subject SAR Variability in Pelvic Region

Ettore Flavio Meliadò1, Alexander J.E Raaijmakers1, Matthew C. Restivo1, Matteo Maspero1, Peter R. Luijten1, and Cornelis A.T. van den Berg1

1Center for Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands

A reliable technique to assess the 10g averaged Specific Absorption Rate is necessary for parallel transmit ultra-high field body MRI. We believe that the best solution is to build a database with many different models. We have created nine dedicated body models and performed FDTD simulations on them to evaluate the inter-subject variability for prostate imaging at 7T using fractionated dipole antennas. Maximum SAR10g ranges from 1.64 to 2.48W/kg with 8x1W input power. No relationship was found between BMI and maximum SAR10g. Intra-subject variability (caused by slight antenna positioning variability, +/-2cm) was also investigated showing up to 67.8% SAR variability.

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