Abstract #3241
Biexponential T 1 Relaxation at 7T: Characterization and Impact on T 1 Mapping
James A. Rioux 1 , Ives R. Levesque 1,2 , and Brian K. Rutt 1
1
Radiology, Stanford University, Stanford,
CA, United States,
2
Medical
Physics Unit, and Research Institute of the McGill
University Health Centre, McGill University, Montreal,
QC, Canada
White matter exhibits biexponential relaxation, which is
neglected in T
1
measurements
at low field strengths, but which is a significant
source of variation between reported T
1
values
at high field. If the effect of the shorter T
1
component
can be removed, such that only the longer component is
measured, the resulting T
1
value
will be more reproducible across sites and protocols. We
characterized biexponential relaxation in white matter
at 7T, finding T
1
values
of 1349ms and 57ms, with 11% of signal from the short
component. Based on these values we recommend using
minimum inversion times of 150-200ms in
inversion-recovery-based sequences.
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.
Click here for more information on becoming a member.
