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.

Advisor: Michael Lustig

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