Abstract #3656

Effects of breast tissue density, size, and positioning on SAR at 7T

Joseph Vincent Rispoli¹

¹Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, United States

It is common practice to perform full-wave electromagnetic modeling to characterize RF transmit coils and establish safety parameters limiting power and SAR to comply with guidelines for pre-clinical use with human volunteers. Currently-available female voxel models are unsuitable for simulating the filling factor of breast coils designed for women in the prone position. Accurate breast modeling is further confounded by variability of lipid and fibroglandular tissues, with modeling implications owing to disparate conductivity and permittivity values. This work presents simulations at 7T using high-resolution, anatomically-correct breast phantoms exhibiting varying proportions of fatty and fibroglandular tissues, as well as breast tissue girth, length, and positioning within the RF coil, demonstrating the effects of these variables in projected SAR for breast imaging.

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