title: Renal volume assessment with 3D ultrasound.
abstract: OBJECTIVE
  This study was undertaken to determine the accuracy of 3D ultrasound (US) in assessing renal volume, with multislice computed tomography (MSCT) considered as the gold standard.
  
  
  METHODS
  Forty-nine patients (30 men, 19 women; age range 30-82 years) underwent abdominal contrast-enhanced MSCT and 3D-US performed with a 3.5-MHz 3D/4D convex-array probe. The results of the two modalities were compared with the Wilcoxon test. Variability between the two measurements was determined with the Bland-Altman method and reported in terms of bias and coefficient of repeatability (CoR).
  
  
  RESULTS
  Mean values obtained were 210 ml with MSCT and 192 ml with 3D-US (p<0.001). Analysis of variability per patient between MSCT and 3D-US showed a bias of 19 ml, a CoR of 47 ml and an accuracy of 78%, with an average 3D-US underestimation of 19 ml (9%). Analysis of variability per kidney showed a bias of 9 ml, a CoR of 34 ml and an accuracy of 80%.
  
  
  CONCLUSIONS
  Three-dimensional US is a valuable technique for monitoring renal volume, whereas MSCT may be reserved for assessing renal anatomy and relationships with neighbouring organs.
authors.affiliation: Dipartimento di Radiologia Diagnostica ed Interventistica, Università degli Studi di Milano, Ospedale San Paolo, Via di Rudinì 8, 20142 Milano, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Brancaforte
authors.forename: S
authors.initials: S
authors.lastname: Serantoni
authors.forename: F
authors.initials: F
authors.lastname: Silva Barbosa
authors.forename: G
authors.initials: G
authors.lastname: Di Leo
authors.forename: F
authors.initials: F
authors.lastname: Sardanelli
authors.forename: G P
authors.initials: GP
authors.lastname: Cornalba
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007668:Kidney / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D014463:Ultrasonography / Q000379:methods