High-Permittivity Pad Design for Dielectric Shimming in Magnetic Resonance Imaging Using Projection-Based Model Reduction and a Nonlinear Optimization Scheme.

Abstract:

:Inhomogeneities in the transmit radio frequency magnetic field ( ) reduce the quality of magnetic resonance (MR) images. This quality can be improved by using high-permittivity pads that tailor the fields. The design of an optimal pad is application-specific and not straightforward and would therefore benefit from a systematic optimization approach. In this paper, we propose such a method to efficiently design dielectric pads. To this end, a projection-based model order reduction technique is used that significantly decreases the dimension of the design problem. Subsequently, the resulting reduced-order model is incorporated in an optimization method in which a desired field in a region of interest can be set. The method is validated by designing a pad for imaging the cerebellum at 7 T. The optimal pad that is found is used in an MR measurement to demonstrate its effectiveness in improving the image quality.

journal_name

IEEE Trans Med Imaging

authors

van Gemert JHF,Brink WM,Webb AG,Remis RF

doi

10.1109/TMI.2018.2791179

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

1035-1044

issue

4

eissn

0278-0062

issn

1558-254X

journal_volume

37

pub_type

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