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Source1

{
  "resourceType": "CodeSystem",
  "id": "rt-target-volume-cs",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "url": "https://nshr-uat.sha.go.ke/fhir/CodeSystem/rt-target-volume-cs",
  "version": "0.1.0",
  "name": "RTTargetVolumeCS",
  "title": "Kenya Radiotherapy Target Volume Code System",
  "status": "active",
  "experimental": false,
  "date": "2026-06-08T10:30:33+00:00",
  "publisher": "Digital Health Agency (DHA), Kenya",
  "contact": [
    {
      "name": "Digital Health Agency (DHA), Kenya",
      "telecom": [
        {
          "system": "url",
          "value": "https://dha.go.ke"
        },
        {
          "system": "email",
          "value": "info@dha.go.ke"
        }
      ]
    },
    {
      "name": "Digital Health Agency Kenya – FHIR Team",
      "telecom": [
        {
          "system": "email",
          "value": "info@dha.go.ke",
          "use": "work"
        },
        {
          "system": "url",
          "value": "https://dha.go.ke",
          "use": "work"
        }
      ]
    }
  ],
  "description": "ICRU-defined target volume concepts used in radiotherapy planning.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "urn:iso:std:iso:3166",
          "code": "KE",
          "display": "Kenya"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "content": "complete",
  "count": 8,
  "concept": [
    {
      "code": "GTV",
      "display": "GTV — Gross Tumour Volume",
      "definition": "Macroscopic extent of tumour visible on imaging."
    },
    {
      "code": "CTV",
      "display": "CTV — Clinical Target Volume",
      "definition": "GTV plus margin for subclinical microscopic disease."
    },
    {
      "code": "ITV",
      "display": "ITV — Internal Target Volume",
      "definition": "CTV plus internal margin for organ motion."
    },
    {
      "code": "PTV",
      "display": "PTV — Planning Target Volume",
      "definition": "ITV plus set-up margin for treatment delivery uncertainty."
    },
    {
      "code": "OAR",
      "display": "OAR — Organ at Risk",
      "definition": "Normal tissue structure whose radiation tolerance limits the prescribed dose."
    },
    {
      "code": "PRV",
      "display": "PRV — Planning Risk Volume",
      "definition": "OAR plus margin for positioning uncertainty."
    },
    {
      "code": "RVR",
      "display": "RVR — Remaining Volume at Risk",
      "definition": "Volume outside GTV/CTV that receives dose."
    },
    {
      "code": "BOOST",
      "display": "Boost Volume",
      "definition": "Sub-volume receiving a higher dose than the main treatment."
    }
  ]
}