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Variation of the magnetic relaxation rate 1/T1 of water protons with magnetic field strength (NMRD Profile) of untreated, non-calcified, human astrocytomas: correlation with histology and solids content

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Summary

The magnetic relaxation rate 1/T1 of tissue water protons was measured over a wide range of magnetic field strengths (NMRD profile) for 92 fresh surgical specimens of astrocytomas to search for correlations of 1/T1 with tumor histology, as determined by light microscopy, and to assess the diagnostic potential of NMRD profiles for grading astrocytomas. A third goal was to elucidate the molecular determinants of 1/T1. Each specimen was histologically graded and inspected for evidence of mineral deposits (Ca, Fe); its dry weight was determined and expressed in % of original wet weight. To minimize variability not directly related to tumor grade, this initial report is limited to NMRD profiles of 47 non-calcified, non-mehorrhagic, untreated astrocytomas. For these, the mean value of 1/T1 at very low magnetic field strenghts was found to increase with increasing grade of malignancy; no clear correlation could be demonstrated at high fields where most imaging is done. The spread of 1/T1 for different grades of malignancy is large, however, and the overlap significant, even at the lowest field, so that astrocytomas can not be graded by NMRD profiles alone. Average 1/T1 and average dry weight increase with grade of malignancy; but the variability of 1/T1 among specimens of the same dry weight is large, indicating that at least one other cellular parameter, not variable in normal tissue, influences 1/T1 strongly. We hypothesize that this parameter reflects changes at the molecular level in size distribution, mobility, or intermolecular interaction of cytoplasmic proteins. Which specific changes are induced by malignant transformation in astrocytomas remains to be investigated.

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Spiller, M., Kasoff, S.S., Lansen, T.A. et al. Variation of the magnetic relaxation rate 1/T1 of water protons with magnetic field strength (NMRD Profile) of untreated, non-calcified, human astrocytomas: correlation with histology and solids content. J Neuro-Oncol 21, 113–125 (1994). https://doi.org/10.1007/BF01052895

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