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Abstract #4424

Optimising TIAMO shim modes for non-conventional RF coils at 7T

Belinda Ding1, Chia-Yin Wu2, Divya Baskaran2, Aleksej Polpudenko2, Son Chu2, Eva McEwan3, Sydney Nicole Williams2, Sarah Allwood-Spiers4, David Porter2, and Shajan Gunamony2,3
1Siemens Healthcare Ltd, Camberley, United Kingdom, 2Imaging Centre of Excellence, University of Glasgow, Glasgow, United Kingdom, 3MR CoilTech Ltd., Glasgow, United Kingdom, 4NHS Greater Glasgow and Clyde, Glasgow, United Kingdom

Synopsis

Keywords: RF Pulse Design & Fields, Parallel Transmit & Multiband, TIAMO, 7T

Motivation: Ultra-high-field MRI is hindered by signal homogeneity issues due to non-uniform B1+ fields. While TIAMO improves image quality by using phase shim pairs, existing methods are incompatible with non-conventional RF coils, which are emerging in UHF imaging.

Goal(s): This study aimed to optimise TIAMO phase shim pairs for non-conventional RF coils to enhance signal homogeneity for UHF-MR.

Approach: We optimised phase shim using B1+ and B1- maps from various custom RF coils, and validated them on a 7T MR scanner.

Results: The optimisation led to significant improvements in image homogeneity, demonstrating the feasibility of extending TIAMO to non-conventional coils.

Impact: This abstract will allow the application of TIAMO on non-conventional RF coils (i.e. coils without a fixed phase increment between adjacent transmit channels) for 7T MR.

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Keywords