title: Diffusion-weighted MR imaging findings of kidneys in patients with early phase of obstruction.
abstract: BACKGROUND
  Diffusion-weighted (DW) magnetic resonance (MR) imaging is an MR technique used to show molecular diffusion. The apparent diffusion coefficient (ADC), as a quantitative parameter calculated from the DW MR images. The purpose of this study is to evaluate the ability of DW MR imaging in early phase of obstruction due to urolithiasis.
  
  
  METHODS
  Twenty-six patients with acute dilatation of the pelvicalyceal system detected by intravenous urography were included in this study. MR imaging was performed using a 1.5 T whole-body superconducting MR scanner. DW imaging can be performed using single-shot spin-echo, echo-planar imaging (EPI) sequences with the following diffusion gradient b values: 100, 600, 1000 s/mm(2). Circular region of interest (ROI) was placed in the renal parenchyma for the measurement of ADC values in the normal and obstructed kidney. For statistical analyses, Paired t test were used.
  
  
  RESULTS
  In spite of obstructed kidneys had the lower ADC values compared to normal kidneys, these alterations were statistically insignificant.
  
  
  CONCLUSIONS
  We did not observe significantly different ADC values of early phase of obstructed kidneys compared to normal kidneys.
authors.affiliation: Department of Radiology, Faculty of Medicine, Firat University, 23119 Elazig, Turkey. bozgeyik4@hotmail.com
authors.forename: Zulkif
authors.initials: Z
authors.lastname: Bozgeyik
authors.forename: Ercan
authors.initials: E
authors.lastname: Kocakoc
authors.forename: Fitnet
authors.initials: F
authors.lastname: Sonmezgoz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007668:Kidney / Q000473:pathology*; D007669:Kidney Calculi / Q000150:complications* / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014517:Ureteral Obstruction / Q000150:complications* / Q000175:diagnosis*; D055815:Young Adult