title: Associations among q-space MRI, diffusion-weighted MRI and histopathological parameters in meningiomas.
abstract: OBJECTIVE
  The purposes of this MR-based study were to calculate q-space imaging (QSI)-derived mean displacement (MDP) in meningiomas, to evaluate the correlation of MDP values with apparent diffusion coefficient (ADC) and to investigate the relationships among these diffusion parameters, tumour cell count (TCC) and MIB-1 labelling index (LI).
  
  
  METHODS
  MRI, including QSI and conventional diffusion-weighted imaging (DWI), was performed in 44 meningioma patients (52 lesions). ADC and MDP maps were acquired from post-processing of the data. Quantitative analyses of these maps were performed by applying regions of interest. Pearson correlation coefficients were calculated for ADC and MDP in all lesions and for ADC and TCC, MDP and TCC, ADC and MIB-1 LI, and MDP and MIB-1 LI in 17 patients who underwent subsequent surgery.
  
  
  RESULTS
  ADC and MDP values were found to have a strong correlation: r = 0.78 (P = <0.0001). Both ADC and MDP values had a significant negative association with TCC: r = -0.53 (p = 0.02) and -0.48 (P = 0.04), respectively. MIB-1 LI was not, however, found to have a significant association with these diffusion parameters.
  
  
  CONCLUSIONS
  In meningiomas, both ADC and MDP may be representative of cell density.
  
  
  CONCLUSIONS
  • Diffusion-weighted MRI offers possibilities to assess the aggressiveness of meningiomas. • The q-space imaging-derived mean displacement correlates strongly with apparent diffusion coefficients. • Both diffusion parameters showed a strong negative association with tumour cell counts. • Derived mean displacement may help assess the aggressiveness of meningiomas preoperatively.
authors.affiliation: Department of Radiology, University of Yamanashi, 1110 Shimokato, Chuo-shi, Yamanashi, 409-3898, Japan.
authors.forename: Zareen
authors.initials: Z
authors.lastname: Fatima
authors.forename: Utaroh
authors.initials: U
authors.lastname: Motosugi
authors.forename: Ahmed Bilal
authors.initials: AB
authors.lastname: Waqar
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hori
authors.forename: Keiichi
authors.initials: K
authors.lastname: Ishigame
authors.forename: Naoki
authors.initials: N
authors.lastname: Oishi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Onodera
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yagi
authors.forename: Ryohei
authors.initials: R
authors.lastname: Katoh
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Araki
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000473:pathology; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology*; D008579:Meningioma / Q000473:pathology*; D008875:Middle Aged; D015588:Observer Variation