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.

Advisors: Michael Lustig

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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