Meeting Banner
Abstract #0666

Matrix Gradient System: Concept and Performance Evaluation

Feng Jia1, Gerrit Schultz1, Anna M. Welz1, Sebastian Littin1, Hans Weber1, Jrgen Hennig1, Maxim Zaitsev1

1Dept. of Radiology, Medical Physics, University Medical Center Freiburg, Freiburg, Germany

Encoding with nonlinear encoding fields (SEMs) has raised increasing interest in the past few years. Matrix coils appear to offer a high flexibility in generating customized SEMs and are particularly promising for localized high resolution imaging applications such as PatLoc or ExLoc. However, up to now, it is still an open question of how to assess the performance of such matrix coils. In this work we propose a new performance measure that is oriented towards optimal local encoding. An optimization problem is formulated that results in high-performance cylindrical matrix coil designs with a high number of elements. The results are tested and the analysis reveals novel features of matrix coil designs.

Keywords

according agreement alignment allocated appear appropriate assess assessed audience body chosen clarity coil coils collinear combinations components considerations considered consisted constraint construction coordinate coordinates corresponds council cylinder cylindrical decrease decreases define defined denote denotes depicted design designs determination development diameter dimensions element elements encoding enhances equal equation eventually every feasible field fields fitting flexibility flowing focus formulated function furthermore future gaps generate generates generating gradient gradients grant grid help hypothesize ideally increasing individual inner inside limitation literature local localized location longitudinal loop magma matrix maxim measure medical next nonlinear novel objective offer optimal optimization oriented orthogonal orthogonality outer past performance power practical previous principle problem promising proportional propose prototype question radial radiology radius rather representation required resolution respectively scaled schematic segments selection semi solved space spatial spherical starting step strategy strong subject surface system target tend tendencies tightly toolbox topologies transparent turns ultimate unshielded upon variation vector vectors volume weber whole