{
  "package" : "hl7.fhir.r4.core@4.0.1",
  "definition" : "Thickness of Aluminum required to reduce the X-Ray output at the patient entrance surface by a factor of two",
  "system" : "http://dicom.nema.org/resources/ontology/DCM",
  "property" : [ ],
  "codesystem" : "edcf6828-b2c8-5028-b7f7-246cb8d5ac80",
  "concept_id" : "fdcf0389-9492-5b74-8255-737cc04d3651",
  "ancestors" : {
    "111634" : 0
  },
  "id" : "d8d93893-5b7b-4b5e-93af-1777167625fa",
  "code" : "111634",
  "display" : "Half Value Layer",
  "version" : "01"
}