Celine Veys and Rafael Calleja

EECS Department, University of California, Berkeley

Technical Report No. UCB/EECS-2021-87

May 14, 2021

http://www2.eecs.berkeley.edu/Pubs/TechRpts/2021/EECS-2021-87.pdf

While low-to-mid field systems in MRI have nearly been abandoned for high-field, high- performance systems, recent improvements in MR hardware, algorithms, and computation have stimulated a resurgence in interest of upgrading lower-end magnets to achieve high performance at significantly lower cost, improved accessibility, portability, and siting. In this project, we upgrade a wrist 1T permanent-magnet system to reduce its field inhomogeneity while maintaining good SNR. We integrate a simple B0 shim array into a solenoid TRX coil for reducing B0 through localized targeted shimming. Through simulations and experiments, we demonstrate improved homogeneity with an initial 6-channel prototype, later upgrading to a full hardware-integrated 16-channel system, with negligible effects on the transmit field and received SNR.

Advisors: Michael Lustig

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BibTeX citation:

@mastersthesis{Veys:EECS-2021-87,
    Author= {Veys, Celine and Calleja, Rafael},
    Editor= {Lustig, Michael},
    Title= {Integrating a Localized B0 Shim Array into a Solenoid Transmit-Receive 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-2021-87.html},
    Number= {UCB/EECS-2021-87},
    Abstract= {While low-to-mid field systems in MRI have nearly been abandoned for high-field, high- performance systems, recent improvements in MR hardware, algorithms, and computation have stimulated a resurgence in interest of upgrading lower-end magnets to achieve high performance at significantly lower cost, improved accessibility, portability, and siting. In this project, we upgrade a wrist 1T permanent-magnet system to reduce its field inhomogeneity while maintaining good SNR. We integrate a simple B0 shim array into a solenoid TRX coil for reducing B0 through localized targeted shimming. Through simulations and experiments, we demonstrate improved homogeneity with an initial 6-channel prototype, later upgrading to a full hardware-integrated 16-channel system, with negligible effects on the transmit field and received SNR.},
}

EndNote citation:

%0 Thesis
%A Veys, Celine 
%A Calleja, Rafael 
%E Lustig, Michael 
%T Integrating a Localized B0 Shim Array into a Solenoid Transmit-Receive Coil for Permanent Magnet Scanners
%I EECS Department, University of California, Berkeley
%D 2021
%8 May 14
%@ UCB/EECS-2021-87
%U http://www2.eecs.berkeley.edu/Pubs/TechRpts/2021/EECS-2021-87.html
%F Veys:EECS-2021-87