Local B0 Shim Array Integrated onto a Solenoid TRX Coil for Permanent Magnet Scanners

Rafael Calleja and Celine Veys

EECS Department
University of California, Berkeley
Technical Report No. UCB/EECS-2021-84
May 14, 2021

http://www2.eecs.berkeley.edu/Pubs/TechRpts/2021/EECS-2021-84.pdf

In the realm of MRI machines, low-to-mid field systems (e.g. permanent magnet scanners) have been nearly abandoned for high-field, high-performance systems (e.g. superconducting scanners). However, recent improvements in MR hardware, algorithms and computation are stimulating a resurgence in interest of upgrading lower-end magnets to achieve high-performance with significantly lower cost, greater accessibility, and more relaxed siting requirements. Towards this goal, we propose an upgrade for a wrist 1T permanent-magnet system in the form of a simple $B_0$ shim array integrated onto a solenoid TRX coil for reducing $B_0$ through localized targeted shimming. We demonstrate improved homogeneity using a 16-channel prototype array with negligible effects on the transmit field and received SNR.

Advisor: Michael Lustig


BibTeX citation:

@mastersthesis{Calleja:EECS-2021-84,
    Author = {Calleja, Rafael and Veys, Celine},
    Editor = {Lustig, Michael},
    Title = {Local B0 Shim Array Integrated onto a Solenoid TRX Coil for Permanent Magnet Scanners},
    School = {EECS Department, University of California, Berkeley},
    Year = {2021},
    Month = {May},
    URL = {http://www2.eecs.berkeley.edu/Pubs/TechRpts/2021/EECS-2021-84.html},
    Number = {UCB/EECS-2021-84},
    Abstract = {In the realm of MRI machines, low-to-mid field systems (e.g. permanent magnet scanners) have been nearly abandoned for high-field, high-performance systems (e.g. superconducting scanners). However, recent improvements in MR hardware, algorithms and computation are stimulating a resurgence in interest of upgrading lower-end magnets to achieve high-performance with significantly lower cost, greater accessibility, and more relaxed siting requirements. Towards this goal, we propose an upgrade for a wrist 1T permanent-magnet system in the form of a simple $B_0$ shim array integrated onto a solenoid TRX coil for reducing $B_0$ through localized targeted shimming. We demonstrate improved homogeneity using a 16-channel prototype array with negligible effects on the transmit field and received SNR.}
}

EndNote citation:

%0 Thesis
%A Calleja, Rafael
%A Veys, Celine
%E Lustig, Michael
%T Local B0 Shim Array Integrated onto a Solenoid TRX Coil for Permanent Magnet Scanners
%I EECS Department, University of California, Berkeley
%D 2021
%8 May 14
%@ UCB/EECS-2021-84
%U http://www2.eecs.berkeley.edu/Pubs/TechRpts/2021/EECS-2021-84.html
%F Calleja:EECS-2021-84