# OnCo record target-delineation-variability (term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)". Whole corpus: https://onco.cc/api/v1/onco.nt
@prefix schema: <https://schema.org/> .
@prefix onco: <https://onco.cc/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://onco.cc/terms/target-delineation-variability/>
  a schema:DefinedTerm ;
  onco:kind "term" ;
  schema:identifier "target-delineation-variability" ;
  schema:name "Variation between clinicians in drawing the radiotherapy target"@en ;
  schema:alternateName "delineation variability"@en, "contouring variability"@en, "inter-observer variability in contouring"@en, "target volume delineation"@en ;
  schema:description "Before a radiotherapy plan can be made, a doctor draws the tumour and the organs around it on the planning scan, and two doctors given the same scan do not draw the same outline. A 2016 review found 119 studies measuring this across every major cancer site, and only one in five checked what the differences did to the dose."@en ;
  schema:url <https://onco.cc/terms/target-delineation-variability/> ;
  schema:dateModified "2026-10-20"^^xsd:date ;
  schema:citation <https://doi.org/10.1016/j.radonc.2016.09.009>, <https://www.nice.org.uk/guidance/htg695/chapter/1-Recommendations> ;
  onco:tag "precision", "radiation" ;
  onco:related <https://onco.cc/roadmaps/radiation-roadmap/> ;
  onco:sections <https://onco.cc/fronts/radiation/> ;
  onco:technologies <https://onco.cc/technologies/auto-contouring-ai/>, <https://onco.cc/technologies/imrt-igrt/>, <https://onco.cc/technologies/adaptive-radiotherapy/>, <https://onco.cc/technologies/dose-painting/> ;
  onco:terms <https://onco.cc/terms/planning-target-volume/>, <https://onco.cc/terms/organs-at-risk/> ;
  onco:keyPapers <https://onco.cc/key-papers/paper-vinod-delineation-uncertainty-review-radiother-oncol-2016/>, <https://onco.cc/key-papers/paper-van-herk-ptv-margin-recipe-ijrobp-2000/> .