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.