Meeting Banner
Abstract #1416

Stabilization of bias field on 3D MPRAGE at 7T with dielectric pads and 3D-based B1+ scaling

Giske Opheim1, Vincent O. Boer2, Esben Thade Petersen2,3, Martin Prener1, Olaf B. Paulson1,4, and Jan Ole Pedersen5
1Neurobiology Research Unit, Dept. of Neurology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark, 2Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Hvidovre, Denmark, 3Section for Magnetic Resonance, DTU Health Tech, Technical University of Denmark, Kgs. Lyngby, Denmark, 4Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark, 5Philips Healhtcare, Copenhagen, Denmark

7T MRI has several cases of demonstrated clinical yield, but is challenged by spatial B1 inhomogeneity. Bias fields in structural images may be acceptable for visual and computational analysis, and can to some extent be accounted for by bias-field corrections. However, this is significantly complicated since the characteristics of the bias field often varies between patients. By analyzing stability of bias fields in 3D MPRAGE images, we compared two dielectric pad setups and the impact of 3D-based B1+ scaling, i.e., optimization of the RF gain. We found increased stability by using large pads and 3D-based B1+ scaling in combination.

This abstract and the presentation materials are available to members only; a login is required.

Join Here