title: An analysis of T2 mapping on brain tumors.
abstract: OBJECTIVE
  Vasogenic edema on glioblastoma multiforme (GBM) or a metastatic brain tumor (METS) may have different T2 relaxation time values because it involves an increased water component. In this study, we assessed the diagnostic utility of T2 mapping techniques in distinguishing GBM from METS.
  
  
  METHODS
  We studied a glioblastoma (GBM) patient and a metastatic brain tumor (METS) patient who had not undergone previous surgery or treatment. All MR imaging was carried out using a 3.0-T whole-body unit, and axial T2 maps were generated with five TEs (TE = 20, 40, 60, 80, and 100 ms). Data were analyzed by using image processing and analysis software.
  
  
  RESULTS
  The T2 map of a GBM case showed that the -peritumoral area at a T2 relaxation time of 120-160 ms is prominent compared with the area at 210-240 ms. In contrast, the peritumoral area at 210-240 ms was prominent compared with the area at 120-160 ms in a METS case.
  
  
  CONCLUSIONS
  The distribution of T2 relaxation time in the peritumoral area shows different patterns in glioblastomas and metastatic brain tumors.
authors.affiliation: Department of Neurosurgery, Fukuoka University Chikushi Hospital, Fukuoka, Japan. neuroivr@gmail.com
authors.forename: Kanji
authors.initials: K
authors.lastname: Nakai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nawashiro
authors.forename: Katsuji
authors.initials: K
authors.lastname: Shima
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Kaji
mesh_terms: D000368:Aged; D001931:Brain Mapping; D001932:Brain Neoplasms / Q000473:pathology*; D005260:Female; D005909:Glioblastoma / Q000473:pathology*; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged