Keywords: Pulse Sequence Design, fMRI, 7T, improved fMRI mapping accuracy, EPI, geometric-distortion correction, opposite phase-encoding and reduced acquisition timeIn high-resolution fMRI using EPI, geometric distortions typically seen in reconstructed images significantly hinder the accurate mapping of activated voxels. One method to correct for distortions is to acquire EPI data with an opposite phase-encoding direction. However, this method is usually implemented with an additional run of the same protocol, leading to a redundant measurement of parallel imaging calibration scans. Here, we present an EPI scheme that measures the opposite-direction data in a single fMRI session, substantially reducing the total acquisition time. We demonstrate more accurate functional mapping with the distortion correction in submillimetre whole-brain visual fMRI at 7T.
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