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Abstract #5577

RF safety assessment of a 32-channel integrated body coil for 7 Tesla: Thermal dose evaluation at high SAR level

Thomas M. Fiedler1, Stephan Orzada2, Martina Flöser1, Harald H. Quick2,3, Mark E. Ladd1,2, and Andreas K. Bitz1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, 3High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany

RF safety assessment for a 32-ch body coil for 7T was performed based on SAR, tissue temperature, and a thermal dose model (CEM43°C). Temperature simulations considered a temperature-dependent thermoregulation. The tissue temperature limit is exceeded when SAR limits are adhered to. However, based on the thermal dose limit, the maximum input power determined from SAR limits can be exceeded by up to a factor of 5 without noticeable limitations in permissible exposure time in MR examinations. This increased input power allows for improved B1+ homogeneity with 50% reduced flip angle error compared to the input power determined from SAR limits.

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