{
  "package" : "hl7.fhir.r4.examples@4.0.1",
  "definition" : "The TG18-GA20 Pattern used for quantitative assessment of veiling glare. This pattern is identical to TG18-GQ except that the radius of the central black circle is varied as r = 20. See [AAPM OR 03]",
  "system" : "http://dicom.nema.org/resources/ontology/DCM",
  "property" : [ ],
  "codesystem" : "5f336dd4-db81-5653-939a-25648922f08e",
  "concept_id" : "3ea9c2c9-e4ce-56fc-9b1c-ba84c31d870f",
  "ancestors" : {
    "109875" : 0
  },
  "id" : "9ea834c1-10b9-4934-8a28-72e01f42fee2",
  "code" : "109875",
  "display" : "TG18-GA20 Pattern",
  "version" : "01"
}