Accurate B0 shimming with close-fitting coil arrays can improve brain imaging at 3T and 7T, but slice-optimizing the shimming during acquisition requires fast redistribution of dozens of multi-amp coil currents. Our open-source, low-cost ($80/channel) driver system can redistribute fifty amps to thirty-two coils in milliseconds, with milliamp accuracy. The system uses an easily reprogrammed microcontroller, optical fiber isolation, and thirty-two current-feedback coil-drivers (described previously). When used to drive sixty-four slice-specific sets of currents in a novel 32-coil shim array, stretching in an EPI brain scan was substantially reduced, without introducing driver artifacts.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Keywords