Meeting Banner
Abstract #4622

Improved Accuracy of FLASH-based B1+ Mapping by Optimization of the Fourier Encoding Matrix

Omer F. Oran1, L. Martyn Klassen1, and Ravi S. Menon1,2

1Centre for Functional and Metabolic Mapping, University of Western Ontario, London, ON, Canada, 2Department of Medical Biophysics, University of Western Ontario, London, ON, Canada

FLASH-B1 mapping with a Fourier-encoding scheme works only for a limited range of flip-angles due to pronounced saturation effects that occur for short TR. The transmit voltage can be adjusted to satisfy this requirement in problematic Fourier combinations that have high dynamic range. However, this results in an unnecessary reduction of the dynamic range in combinations that are already within the accepted range. This study addresses this problem by optimizing the Fourier encoding matrix such that the flip-angle is reduced only in regions of high flip-angle in the problematic combinations.

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

Join Here