Abstract:
:A precise understanding of human blood spin-spin relaxation is of major importance for numerous applications, particularly functional magnetic resonance imaging (fMRI), which is increasingly performed at 3 Tesla. It is well known that T2 measured from partially deoxygenated blood depends on the Carr-Purcell Meiboom-Gill (CPMG) refocusing interval (tau180) and on blood oxygenation (Y), yet debate remains over the quantification of this phenomenon, primarily with respect to the accuracy of its characterization by the diffusion and fast two-site exchange models. In this study, a detailed characterization of the deoxygenation-induced T2 reduction in human whole blood, as well as a comprehensive assessment of the role of tau180, were performed at 3 T. The diffusion model was found to better fit the observed T2 behavior as compared with the exchange model. The estimated diffusion-model parameters suggest the T2 decay enhancement at 3 T is due to a linear increase in the magnitude of deoxygenation-induced field inhomogeneities with field strength. These findings also confirm the potential of tau180 manipulation in measuring changes in venous blood volume.
journal_name
Magn Reson Medjournal_title
Magnetic resonance in medicineauthors
Chen JJ,Pike GBdoi
10.1002/mrm.21858subject
Has Abstractpub_date
2009-02-01 00:00:00pages
249-54issue
2eissn
0740-3194issn
1522-2594journal_volume
61pub_type
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