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pubmed-article:2492712pubmed:abstractTextHuman and rat cervical spinal cords were imaged with high-resolution spin-echo and inversion-recovery pulse sequences in an experimental 1.9-T MR system. The gross morphology of the cord was easily discernible in fresh and fixed specimens, including the white and gray commissures, dorsal and ventral horns, and lateral and posterior funiculi. The T1, T2, and spin-density values for gray and white matter were determined from these images and were found to be 914 msec, 114 msec, and 71% for white matter other than the dorsal columns, and 946 msec, 87 msec, and 80% for gray matter in human spinal cords. These values are reduced considerably after formalin fixation: T1 to 56% (white matter) and 54% (gray matter) of prefixation values, T2 to 52% (white matter) and 70% (gray matter) of fresh values, and spin density to 90% (white matter) and 96% (gray matter) of prefixation values. Interestingly, the central gray matter demonstrates higher signal intensity than the white matter on both short and long TR/TE images. This intensity difference was observed for both human and rat spinal cords, before and after fixation, and can be explained by the relatively small T1 differences between gray matter and white matter and the gray matter-white matter spin-density ratios: 1.127 for fresh and 1.203 for fixed specimens.lld:pubmed
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pubmed-article:2492712pubmed:authorpubmed-author:JosephP MPMlld:pubmed
pubmed-article:2492712pubmed:authorpubmed-author:CarvlinM JMJlld:pubmed
pubmed-article:2492712pubmed:authorpubmed-author:HackneyD BDBlld:pubmed
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pubmed-article:2492712pubmed:volume10lld:pubmed
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pubmed-article:2492712pubmed:pagination13-7lld:pubmed
pubmed-article:2492712pubmed:dateRevised2008-2-14lld:pubmed
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pubmed-article:2492712pubmed:articleTitleHigh-resolution MR of the spinal cord in humans and rats.lld:pubmed
pubmed-article:2492712pubmed:affiliationDepartment of Radiology, University of Pennsylvania, Philadelphia 19104-6086.lld:pubmed
pubmed-article:2492712pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2492712pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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