title: [3D automatic expansion: clinical application].
abstract: The determination of the various volumes (GTV: gross target volume, CTV: clinical target volume, PTV: planned target volume) recommended by the ICRU 50 report is a critical step in conformal treatment planning, since treatment optimisation procedures and documentation rely on accurate dose-volume histograms. The shape and the size of the CTV vary with the computer algorithm, the patient image acquisition parameters, the definition of the GTV and the margins surrounding it. The automatic expansion programs included in commercially available treatment planning system require careful validation and control before and during their routine use by the clinicians. Significant differences have been observed between 2D- and 3D-based expansions, with a usual underestimation of the PTV by 2D algorithms.
authors.affiliation: Service de radiophysique, institut Curie, Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: Gaboriaud
authors.forename: D
authors.initials: D
authors.lastname: Pontvert
authors.forename: J C
authors.initials: JC
authors.lastname: Rosenwald
mesh_terms: D000465:Algorithms; D015982:Bias; D006801:Humans; D017410:Practice Guidelines as Topic; D011856:Radiographic Image Enhancement / Q000379:methods* / Q000592:standards; D011858:Radiographic Magnification / Q000379:methods* / Q000592:standards; D011879:Radiotherapy Dosage; D020266:Radiotherapy, Conformal / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D012986:Software Validation
vernacular_title: L'expansion 3D automatique: application clinique.