title: Standardisation in ultrasonography: principle and diagnostic significance.
abstract: Disadvantage of ultrasonography is its dependence on subjective assessment of displayed images. The way how to minimize both intraobserver and interobserver differences is creation of standard conditions for examination including a quantitative approach to evaluation of tissue reflectivity. The oldest mode of standardisation is standardised A- scan, used in ophthalmology. It enables differentiation of echoes, reflected from different ocular structures and is helpful in assessment of extraocular muscle thickness. Standardisation of B-scan depends on the type of diagnostic device and is based on quantification of image echogenicity. In our study reference values of grey-level histogram were established for some thyroid diseases using standard setting of imaging parameters. Results indicate that both standardised A- and B-scan should be helpful in differential diagnostics.
authors.affiliation: Masaryk University of Brno, Faculty of Medicine, Czech Republic. zhlinom@fnbrno.cz
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Hlinomazová
authors.forename: Ivo
authors.initials: I
authors.lastname: Hrazdira
mesh_terms: D006801:Humans; D014463:Ultrasonography / Q000592:standards*