title: Interobserver and intraobserver variability of measurements of uveal melanomas using standardised echography.
abstract: OBJECTIVE
  To report on the intraindividual and interindividual variability of tumour size (height and base diameter) measurements using standardised echography in a masked prospective study.
  
  
  METHODS
  20 consecutive eyes of 20 patients were examined on four different visits by three experienced examiners using standardised echography. As common in standardised echography, tumour height was evaluated with A-scan technique, while transverse and longitudinal base diameter were calculated with B-scan.
  
  
  RESULTS
  Tumour height measurements using A-scan were more accurate than base diameter measurements using B-scan. The standard deviation for tumour height over all visits/measurements was 0.18 mm (A-scan), 0.79 mm for transverse, and 0.69 mm for longitudinal base diameters (B-scan). The interclass correlation coefficient (ICC) was much higher for tumour height measurements with A-scan (0.7735 for three examiners on one visit) than for transverse (0.6563) or longitudinal (0.4522) base diameter measurements with B-scan techniques.
  
  
  CONCLUSIONS
  A-scan techniques for tumour height measurements provide very reproducible results with little intraindividual and interobserver variability. As B-scan techniques for tumour base evaluation are less accurate they should be used for topographic and morphological examinations.
authors.affiliation: Department of Ophthalmology, Ludwig-Maximilians-University, Munich, Germany. Christos.Haritoglou@ak-i.med.uni-muenchen.de
authors.forename: C
authors.initials: C
authors.lastname: Haritoglou
authors.forename: A S
authors.initials: AS
authors.lastname: Neubauer
authors.forename: H
authors.initials: H
authors.lastname: Herzum
authors.forename: W R
authors.initials: WR
authors.lastname: Freeman
authors.forename: A J
authors.initials: AJ
authors.lastname: Mueller
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008545:Melanoma / Q000000981:diagnostic imaging* / Q000473:pathology; D008875:Middle Aged; D015588:Observer Variation; D011446:Prospective Studies; D015203:Reproducibility of Results; D014463:Ultrasonography; D014604:Uveal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology