Design of optimized shimming equipment is under way for UHF MRI of the human brain. Here shimming theoretical limits are explored. With a simple model, proof is given that, depending on field source distribution around a zone of interest, no shimming hardware external to such a zone can fully mitigate the inhomogeneous field. A simulation is performed on a 100-subject database to establish hard shim limits on the whole brain. On the other hand, 3D region-specific shimming is shown to be a very effective way to improve homogeneity in critical zones such as the pre-frontal cortex and around ear canals.
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