Proton nuclear magnetic resonance spectroscopy of normal and edematous brain tissue in vitro: Changes in relaxation during tissue storage |
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Authors: | Michael E Moseley Merry C Nishimura Lawrence H Pitts Henry M Bartkowski Thomas L James |
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Institution: | 1. Department of Neurosurgery, San Francisco General Hospital, San Francisco, California 94143 USA;2. Department of Pharmaceutical Chemistry, School of Pharmacy, University of California, San Francisco, California 94143 USA |
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Abstract: | Proton nuclear magnetic resonance relaxation times, T1 and T2, of water in unfixed gray and white matter from normal and edematous rabbit brain tissues were measured in vitro at 23°C and 100 MHz to evaluate the effects of the temperature (?25°C to 37°C) and duration (0 to 96 h) of tissue storage on relaxation times. T1 and T2 tended to decrease during storage, probably from slow dehydration of the tissue. This effect was greatest in tissues stored at 37°C and least in those stored at 4 and ?25°C; decreases in T1 and T2 were greater in white matter than in gray matter. Freezing brain tissue to ?25°C caused a sudden decrease in the T2 of normal white matter. Relaxation times were constant for 5 h in tissues stored at 23°C and for 40 h at 4°C. These results correlated well with corresponding tissue water loss. |
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Keywords: | NMR spectroscopy Brain edema Storage temperature Water relaxation |
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