{
  "package" : "hl7.fhir.r4.core@4.0.1",
  "definition" : "TG18-GQN Pattern used for the quantitative assessment of veiling glare. This pattern is identical to AAPM TG18-GQ Pattern except that the large-diameter white circle is replaced with a black circle, creating a completely black pattern except for the presence of low-contrast targets. See [AAPM OR 03]",
  "system" : "http://dicom.nema.org/resources/ontology/DCM",
  "property" : [ ],
  "codesystem" : "edcf6828-b2c8-5028-b7f7-246cb8d5ac80",
  "concept_id" : "205330dd-881f-5a5e-92f7-dfe49e805a33",
  "ancestors" : {
    "109868" : 0
  },
  "id" : "3ed5ba12-0157-49c9-94de-b9c159b6e272",
  "code" : "109868",
  "display" : "TG18-GQN Pattern",
  "version" : "01"
}