Keywords: High-Field MRI, Artifacts, multi-gradient-recalled-echo, macroscopic field inhomogeneities, Voxel Spread Function, Ultra-high field MRI
Motivation: The macroscopic field inhomogeneities are proportional to the external magnetic field, poses significant challenges for quantifying the R2* from multi-gradient-recalled-echo (mGRE) MR sequences at 7T.
Goal(s): This study aiming to demonstrates the effectiveness of the voxel spread function (VSF) method in mitigating artifacts on R2* caused by these inhomogeneities.
Approach: Six healthy volunteers underwent MR scans at 7T (Terra Siemens). R2* values were obtained with and without VSF correction from both unfiltered and Hanning-filtered mGRE data.
Results: The results showed that VSF correction significantly reduced the overestimation of R2*, proving its utility in accurate estimation of quantitative MR metrics at 7T.
Impact: The voxel spread function (VSF) method shows great promise in correcting macroscopic magnetic field inhomogeneities in mGRE images, aiding in the accurate estimation of quantitative mGRE metrics such as R2* and myelin water fraction at ultra-high field MRI.
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