Kenya National Cancer Control Programme (NCCP) FHIR Implementation Guide, published by Digital Health Agency (DHA), Kenya. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/IntelliSOFT-Consulting/nccpFHIRIG/ and changes regularly. See the Directory of published versions

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: Kenya Radiotherapy Target Volume Code System

Active as of 2026-06-04

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{
  "resourceType" : "CodeSystem",
  "id" : "rt-target-volume-cs",
  "language" : "en",
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: CodeSystem rt-target-volume-cs</b></p><a name=\"rt-target-volume-cs\"> </a><a name=\"hcrt-target-volume-cs\"> </a><p>This case-sensitive code system <code>https://nshr-uat.sha.go.ke/fhir/CodeSystem/rt-target-volume-cs</code> defines the following codes:</p><table class=\"codes\"><tr><td style=\"white-space:nowrap\"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style=\"white-space:nowrap\">GTV<a name=\"rt-target-volume-cs-GTV\"> </a></td><td>GTV — Gross Tumour Volume</td><td>Macroscopic extent of tumour visible on imaging.</td></tr><tr><td style=\"white-space:nowrap\">CTV<a name=\"rt-target-volume-cs-CTV\"> </a></td><td>CTV — Clinical Target Volume</td><td>GTV plus margin for subclinical microscopic disease.</td></tr><tr><td style=\"white-space:nowrap\">ITV<a name=\"rt-target-volume-cs-ITV\"> </a></td><td>ITV — Internal Target Volume</td><td>CTV plus internal margin for organ motion.</td></tr><tr><td style=\"white-space:nowrap\">PTV<a name=\"rt-target-volume-cs-PTV\"> </a></td><td>PTV — Planning Target Volume</td><td>ITV plus set-up margin for treatment delivery uncertainty.</td></tr><tr><td style=\"white-space:nowrap\">OAR<a name=\"rt-target-volume-cs-OAR\"> </a></td><td>OAR — Organ at Risk</td><td>Normal tissue structure whose radiation tolerance limits the prescribed dose.</td></tr><tr><td style=\"white-space:nowrap\">PRV<a name=\"rt-target-volume-cs-PRV\"> </a></td><td>PRV — Planning Risk Volume</td><td>OAR plus margin for positioning uncertainty.</td></tr><tr><td style=\"white-space:nowrap\">RVR<a name=\"rt-target-volume-cs-RVR\"> </a></td><td>RVR — Remaining Volume at Risk</td><td>Volume outside GTV/CTV that receives dose.</td></tr><tr><td style=\"white-space:nowrap\">BOOST<a name=\"rt-target-volume-cs-BOOST\"> </a></td><td>Boost Volume</td><td>Sub-volume receiving a higher dose than the main treatment.</td></tr></table></div>"
  },
  "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" : "2026-06-04T14:49:30+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."
    }
  ]
}