Abstract #5459

B1+ maps in adults and children heads at 7.0T: selection of the generic human head model and maximum local SAR evaluation

Gianluigi Tiberi^1,2, Mauro Costagli^1,2, Laura Biagi², Nunzia Fontana³, Riccardo Stara⁴, Mark R Symms⁵, Mirco Cosottini⁶, Renzo Guerrini⁷, and Michela Tosetti^1,2

¹Imago7, Pisa, Italy, ²IRCCS Stella Maris Foundation, Pisa, Italy, ³Dipartimento di Ingegneria dell'Informazione, Pisa, Italy, ⁴Dipartimento di Fisica, Pisa, Italy, ⁵General Electric ASL Scientist (EMEA), Pisa, Italy, ⁶Dipartimento di Ricerca Traslazionale e delle Nuove Tecnologie in Medicina e Chirurgia, Pisa, Italy, ⁷Meyer Children’s Hospital, Firenze, Italy

In this study we compare B1+ simulations performed on generic anatomic models with subject-specific measured B1+ maps, performed on both adults and children. We introduce a cost function, based on the normalized standard deviations (the ratio between standard deviation and average) of B1+ maps (magnitude), to guide the selection of generic human model to be used for subject-specific maximum local SAR evaluation. Maximum local SAR does not show a significant variation with subject weight and with subject cranial circumference. Limits on maximum SAR are always met for the sequence here considered (SILENT), in all adults and children.

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