title: Assessment of T1 time course changes and tissue-blood ratios after Gd-DTPA administration in brain tumors.
abstract: Sequential T1 changes in brain tumor tissue after Gd-DTPA administration were investigated in 10 patients, including 4 meningiomas, 2 gliomas, 3 metastatic cerebral tumors and 1 brain abscess. T1 values were measured serially for 60 minutes following Gd-DTPA injection using a magnetic focusing technique. In vitro T1 of the whole blood samples was also comparatively examined. Time processes in the tissue-blood ratio (TBR) were calculated from two-point relaxation rates at 5 and 30 minutes. The obtained ratios of TBR were ranged from 1.0 to 3.0, probably depending on histological types of brain tumor (the value of 1.0 to 1.5 for meningioma and 1.5 to 3.0 for glioma and metastatic tumor). No significant changes in the T1 value were observed in the examined normal tissue and peritumoral edema. These results indicate that Gd-DTPA plays an important role not only as an image enhancer for tumor tissue but also as an indicator for estimating the blood-brain barrier function.
authors.affiliation: Department of Neurosurgery, Nakatsugawa Municipal General Hospital, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: M
authors.initials: M
authors.lastname: Furuse
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneoke
authors.forename: K
authors.initials: K
authors.lastname: Saso
authors.forename: S
authors.initials: S
authors.lastname: Inao
authors.forename: Y
authors.initials: Y
authors.lastname: Motegi
authors.forename: K
authors.initials: K
authors.lastname: Ichihara
authors.forename: A
authors.initials: A
authors.lastname: Izawa
mesh_terms: D000328:Adult; D000368:Aged; D001812:Blood-Brain Barrier; D001932:Brain Neoplasms / Q000175:diagnosis*; D003287:Contrast Media; D005260:Female; D005682:Gadolinium; D019786:Gadolinium DTPA; D005910:Glioma / Q000175:diagnosis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis; D008579:Meningioma / Q000175:diagnosis; D008875:Middle Aged; D009942:Organometallic Compounds; D004369:Pentetic Acid
chemical_list: D003287:Contrast Media; D009942:Organometallic Compounds; D004369:Pentetic Acid; D005682:Gadolinium; D019786:Gadolinium DTPA