PanCareSurPass Project HL7 FHIR Implementation Guide
1.0.0 - release 150

PanCareSurPass Project HL7 FHIR Implementation Guide, published by PanCareSurPass Project. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/hl7-eu/pcsp/ and changes regularly. See the Directory of published versions

## Extension: Radiotherapy Energy or Isotope

Official URL: http://hl7.eu/fhir/ig/pcsp/StructureDefinition/radiotherapy-energy-or-isotope | Version: 1.0.0
Active as of 2026-01-16 | Computable Name: RadiotherapyEnergyOrIsotope

The radiation energy used for radiotherapy. The energy spectrum is characterized by the maximum energy, the maximum accelaration voltage, or the used isotope. This extension is based on the CodeX™ Radiation Therapy RadiotherapyEnergyOrIsotope extension

Context of Use

This extension may be used on the following element(s)

- Element ID: `Element`

Usage info

Usages:

- Use this Extension: Procedure: Radiotherapy and Procedure: Radiotherapy Boost

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

- Differential Table
- Snapshot Table
- Statistics/References
- All

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Radiotherapy Energy or Isotope
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "http://hl7.eu/fhir/ig/pcsp/StructureDefinition/radiotherapy-energy-or-isotope"
Slices for value[x] |  | 1..1 |  | Value of extension Slice: Unordered, Open by type:$this
valueCodeableConcept |  |  | CodeableConcept |
valueQuantity |  |  | Quantity(SimpleQuantity) |
value[x]:valueQuantity |  | 0..1 | SimpleQuantity | The spectrum of radiation energy characterized by a maximum value. For electrons, the maximum energy is given in MeV. For photons, the maximum acceleration voltage is given in MV or kV, although those are not units of energy. Binding: Radiotherapy dose units (required)
value[x]:valueCodeableConcept |  | 0..1 | CodeableConcept | The isotope used for radiotherapy. Binding: Radiotherapy Isotopes (extensible)
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Radiotherapy Energy or Isotope
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "http://hl7.eu/fhir/ig/pcsp/StructureDefinition/radiotherapy-energy-or-isotope"
Slices for value[x] |  | 1..1 |  | Value of extension Slice: Unordered, Closed by type:$this
valueCodeableConcept |  |  | CodeableConcept |
valueQuantity |  |  | Quantity(SimpleQuantity) |
value[x]:valueQuantity |  | 0..1 | SimpleQuantity | The spectrum of radiation energy characterized by a maximum value. For electrons, the maximum energy is given in MeV. For photons, the maximum acceleration voltage is given in MV or kV, although those are not units of energy. Binding: Radiotherapy dose units (required)
value[x]:valueCodeableConcept |  | 0..1 | CodeableConcept | The isotope used for radiotherapy. Binding: Radiotherapy Isotopes (extensible)
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type CodeableConcept, Quantity: The radiation energy used for radiotherapy. The energy spectrum is characterized by the maximum energy, the maximum accelaration voltage, or the used isotope. This extension is based on the CodeX™ Radiation Therapy RadiotherapyEnergyOrIsotope extension

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Radiotherapy Energy or Isotope
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "http://hl7.eu/fhir/ig/pcsp/StructureDefinition/radiotherapy-energy-or-isotope"
Slices for value[x] |  | 1..1 |  | Value of extension Slice: Unordered, Open by type:$this
valueCodeableConcept |  |  | CodeableConcept |
valueQuantity |  |  | Quantity(SimpleQuantity) |
value[x]:valueQuantity |  | 0..1 | SimpleQuantity | The spectrum of radiation energy characterized by a maximum value. For electrons, the maximum energy is given in MeV. For photons, the maximum acceleration voltage is given in MV or kV, although those are not units of energy. Binding: Radiotherapy dose units (required)
value[x]:valueCodeableConcept |  | 0..1 | CodeableConcept | The isotope used for radiotherapy. Binding: Radiotherapy Isotopes (extensible)
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Radiotherapy Energy or Isotope
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "http://hl7.eu/fhir/ig/pcsp/StructureDefinition/radiotherapy-energy-or-isotope"
Slices for value[x] |  | 1..1 |  | Value of extension Slice: Unordered, Closed by type:$this
valueCodeableConcept |  |  | CodeableConcept |
valueQuantity |  |  | Quantity(SimpleQuantity) |
value[x]:valueQuantity |  | 0..1 | SimpleQuantity | The spectrum of radiation energy characterized by a maximum value. For electrons, the maximum energy is given in MeV. For photons, the maximum acceleration voltage is given in MV or kV, although those are not units of energy. Binding: Radiotherapy dose units (required)
value[x]:valueCodeableConcept |  | 0..1 | CodeableConcept | The isotope used for radiotherapy. Binding: Radiotherapy Isotopes (extensible)
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type CodeableConcept, Quantity: The radiation energy used for radiotherapy. The energy spectrum is characterized by the maximum energy, the maximum accelaration voltage, or the used isotope. This extension is based on the CodeX™ Radiation Therapy RadiotherapyEnergyOrIsotope extension

Other representations of profile: CSV, Excel, Schematron

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Extension.value[x]:valueQuantity | Base | required | Radiotherapy dose units | 📦1.0.0 | This IG
Extension.value[x]:valueCodeableConcept | Base | extensible | Radiotherapy Isotopes | 📦1.0.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`