One of the main problems at UHF resonance frequencies is the significant spatial variation in radiofrequency electromagnetic fields. Mitigating this problem has been one of the goals of the parallel transmission MRI, but it causes greater local SAR variability, which has led to more rigorous safety restrictions. We have used MARIE with an MRGF implementation to study position sensitivity of SAR estimation at 7T by performing multiple simulations in which the coil is moved with respect to the head. We observe higher positional variability in rotational perturbations than in translational ones with solutions obtained in 7.5 min per body-coil configuration.
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