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Towards quantitative measurements of relaxation times and other parameters in the brain

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Summary

The nature and physical significance of the relaxation times T1 and T2 and of proton density are described. Methods of measuring T1 and T2 are discussed with emphasis on the establishment of precision and the maintenance of accuracy. Reported standards of success are briefly reviewed. We expect sensitivities of the order of 1% to be achievable in serial studies. Although early hopes of disease diagnosis by tissue characterisation were not realised, strict scientific method and careful calibration have made it practicable to apply relaxation time measurement to research into disease process. Serial measurements in patients and correlation with similar studies in animal models, biopsy results and autopsy material taken together have provided new knowledge about cerebral oedema, water compartmentation, alcoholism and the natural history of multiple sclerosis. There are prospects of using measurement to monitor treatment in other diseases with diffuse brain abnormalities invisible on the usual images. Secondarily derived parameters and notably the quantification of blood-brain barrier defect after injection of Gadolinium-DTPA also offer prospects of valuable data.

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  1. Multiple Sclerosis NMR Research Group, Institute of Neurology, London, England

    P. S. Tofts & E. P. G. H. du Boulay

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  1. P. S. Tofts
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  2. E. P. G. H. du Boulay
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Tofts, P.S., du Boulay, E.P.G.H. Towards quantitative measurements of relaxation times and other parameters in the brain. Neuroradiology 32, 407–415 (1990). https://doi.org/10.1007/BF00588474

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