| # | | Name | Source | Ver | Description |
| 1 | | Course Involves Reirradiation | hl7.fhir.us.codex-radiation-therapy#current | R4 | This flag is true if the radiotherapy course of treatment involves reirradiation of targets or organs at risk that were already irradiated in previous courses. |
| 2 | | Custodian R5 backport | hl7.fhir.us.mcc#current | R4 | When populated, the custodian is responsible for the care and maintenance of the care plan. The care plan is attributed to the custodian. The custodian might or might not be a contributor. This CarePlan.custodian extension should be used instead of CarePlan.author which in R4 is currently identified as the designated responsible party and in R5 has been removed. |
| 3 | | Dose Planned to Volume | hl7.fhir.us.codex-radiation-therapy#current | R4 | Dose parameters planned for one radiotherapy volume. |
| 4 | | Dose Prescribed to Volume | hl7.fhir.us.codex-radiation-therapy#current | R4 | Dose parameters prescribed for one radiotherapy volume. |
| 5 | | Energy or Isotope | hl7.fhir.us.codex-radiation-therapy#current | R4 | The radiation energy used for radiotherapy. The energy spectrum is characterized
by the maximum energy, the maximum accelaration voltage, or the used isotope. |
| 6 | | Free-Breathing Motion Management Technique | hl7.fhir.us.codex-radiation-therapy#current | R4 | Technique to manage respiratory motion with free-breathing. |
| 7 | | Image Guided Radiotherapy Modality | hl7.fhir.us.codex-radiation-therapy#current | R4 | The modality and associated energy used for imaging in Image Guided Radiotherapy (IGRT) |
| 8 | | Number of Delivered Fractions | hl7.fhir.us.codex-radiation-therapy#current | R4 | The total number of fractions (treatment divisions) actually delivered for this volume. |
| 9 | | Number of Planned Fractions | hl7.fhir.us.codex-radiation-therapy#current | R4 | The number of planned fractions in this scope.
This extension SHALL only be present if the treatment is structured as countable fractions, for example in a Radiotherapy Planned Phase or in a Radiotherapy Treatment Plan. |
| 10 | | Number of Prescribed Fractions | hl7.fhir.us.codex-radiation-therapy#current | R4 | The number of prescribed fractions in this scope.
This extension SHALL only be present if the treatment is structured as countable fractions, for example in a Radiotherapy Phase Prescription. |
| 11 | | Point Dose | hl7.fhir.us.codex-radiation-therapy#current | R4 | This flag is true if the dose is determined at a single point.
Point doses are often used to check dose at a specific point in a calculated 3D dose distribution.
Since point doses mostly have a technical role, high-level summaries may decide to exclude them from displays. |
| 12 | | Primary Plan Dose | hl7.fhir.us.codex-radiation-therapy#current | R4 | This flag is true if the dose is the primary plan dose in a radiotherapy treatment plan.
For a single treatment plan, the primary plan dose serves as the main dose value for tracking delivered dose vs. planned dose.
In summaries over multiple treatment plans, the flag indicates that the dose is a primary plan dose in any of the summarized plans. |
| 13 | | Radiotherapy Volume Extension | hl7.fhir.us.codex-radiation-therapy#current | R4 | Extension providing a reference to a RadiotherapyVolume |
| 14 | | Reason for Revision or Adaptation | hl7.fhir.us.codex-radiation-therapy#current | R4 | The reason a planned or prescribed radiotherapy treatment was revised, superceded, or adapted. |
| 15 | | Reference to DICOM SOP Instance | hl7.fhir.us.codex-radiation-therapy#current | R4 | A reference to a DICOM SOP Instance. |
| 16 | | Respiratory Motion Management | hl7.fhir.us.codex-radiation-therapy#current | R4 | Method applied to manage respiratory motion. |
| 17 | | Treatment Applicator Type | hl7.fhir.us.codex-radiation-therapy#current | R4 | Radiotherapy Treatment Applicator Type. |
| 18 | | Uniform Fractionation | hl7.fhir.us.codex-radiation-therapy#current | R4 | This flag is true if the fractionation was uniform (i.e., treated with same modality and dose per fraction) and false if the fractionation was mixed. Treatment technique may vary in uniform fractionation.
If the fractionation was uniform, then the correspondence between the physical and biologically effective dose can be determined at the course level.
If the fractionation was not uniform, then the correspondence between the physical and biologically effective dose has to be determined per the phase level.
The flag was introduced to support determination of whether fractionation was uniform when viewing the Radiotherapy Course Summary (without first checking the details of each treatment phase).
This is important in registry use cases to efficiently assess whether checking phase level information is needed. |