Abstract #3009

High Quality Whole Brain MP2RAGE at 7T: Utilization of Thin Dielectric Pads

Kieran O'Brien¹, Tobias Kober², Jose Marques³, Franois Lazeyras¹, Rolf Gruetter,¹⁴, Gunnar Krueger²

¹CIBM, University of Geneva, Geneva, Switzerland; ²Advanced Clinical Imaging Technology, Siemens Healthcare IM S AW, Lausanne, Switzerland; ³CIBM-AIT, Ecole Polytechnique Fdrale de Lausanne & Univertisy of Lausanne, Lausanne, Switzerland; ⁴CIBM-AIT, cole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland

At ultra high fields (>3T), whole brain 3D MP2RAGE acquisition suffer from poor inversion in the Cerebellum. In particular, when a subjects head size is large relative to the physical z coverage of the transmit coil, the radiofrequency (RF) power available is not sufficient to overcome the adiabatic condition. Introducing thin dielectric pads enables the RF distributions hot spot to be redistributed towards the cerebellum. This improves the RF power and ensures better inversion efficiency enabling high quality whole brain coverage in 3D MP2RAGE scans for all subjects to be obtained.