title: MR imaging: possibility of tissue characterization of brain tumors using T1 and T2 values.
abstract: To evaluate the usefulness of T1 and T2 values for tissue characterization of brain tumors, 37 histologically confirmed brain tumors were examined with a 0.5-T superconductive MR system. With spin-echo and inversion-recovery imaging sequences, computed T1 and T2 images were reconstructed, and T1 and T2 values of the tumors were calculated. Relaxation rates (1/T1 and 1/T2), T1/T2 ratios, and malignancy indexes, which were originally designed for gastrointestinal tumors, were also calculated. Values of all these parameters were so wide-ranged that it was impossible to characterize the tumor tissue types.
mesh_terms: D000236:Adenoma / Q000473:pathology; D000293:Adolescent; D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000473:pathology*; D002648:Child; D003390:Cranial Nerve Neoplasms / Q000473:pathology; D005260:Female; D005909:Glioblastoma / Q000473:pathology; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008579:Meningioma / Q000473:pathology; D008875:Middle Aged; D009442:Neurilemmoma / Q000473:pathology; D010911:Pituitary Neoplasms / Q000473:pathology