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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 Tiberi1,2, Mauro Costagli1,2, Laura Biagi2, Nunzia Fontana3, Riccardo Stara4, Mark R Symms5, Mirco Cosottini6, Renzo Guerrini7, and Michela Tosetti1,2

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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