| DICOM PS3.3 2024d - Information Object Definitions |
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Table C.36.10-1 specifies the Attributes of the RT Radiation Set Module, which describe treatment fractions that contain a set of beams or brachytherapy setups used within a treatment session to help achieve the dosimetric requirements of a given Treatment Phase. The Module references a set of RT Radiation Instances that describe the geometric and physical parameters that define the delivery of dose for a single fraction. In addition, the overall number of treatment fractions is defined, as well as possibly the fractionation scheme according to which, fractions will be delivered.
A Treatment Phase is achieved by delivering one or more RT Radiation Sets. The chronological relationships between RT Radiation Sets (the actual start of each set, the order or timing among sets, etc.) are recorded in Attributes outside the RT Radiation Set Module.
Table C.36.10-1. RT Radiation Set Module Attributes
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Include Table 10.9.1-1 “Enhanced Content Identification Macro Attributes”. |
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Number of Fractions for which this RT Radiation Set is intended to be repeated. Required if Referenced RT Physician Intent Sequence (300A,063B) is empty. May be present otherwise. See Section C.36.10.1.4. |
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Include Table C.36.2.1.1-1 “Radiation Fraction Pattern Macro Attributes”. |
See Section C.36.10.1.4. |
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RT Physician Intent Instance this Radiation Set is based upon. |
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>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
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Value of RT Prescription Index (3010,003C) in the RT Prescription Sequence (3010,006B) specifying the prescription to which this RT Radiation Set is related. |
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A general indication of the intended use of this RT Radiation Set. See Section C.36.10.1.1. |
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Treatment Position Groups defined for the included Radiation Instances. Zero or more Items shall be included in this Sequence. See Section C.36.10.1.3. |
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RT Radiation Instances that belong to the Treatment Position Group. Each referenced Radiation Instance shall appear once and only once in the Treatment Position Group Sequence (300A,060A). |
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>>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
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RT Radiation Instances which are referenced by this RT Radiation Set. One or more Items shall be included in this Sequence. See Section C.36.10.1.2. |
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>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
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Instances containing the source of the RT Radiation Set information. Only a single Item is permitted in this Sequence. Permitted Referenced SOP Class is RT Plan Storage ("1.2.840.10008.5.1.4.1.1.481.5"). See Section C.8.8.13.2. |
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>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
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RT Radiation Set Intent (300A,0637) describes the intended usage of the Radiation Set. RT Radiation Set Usage (300A,0707) and RT Radiation Usage (300A,0701) record the actual usage of the Radiation Set or individual Radiations, which may differ from the intent.
Defined Terms for RT Radiation Set Intent (300A,0637), RT Radiation Set Usage (300A,0707) and RT Radiation Usage (300A,0701)
This Instance is for performing or recording treatment delivery. This does not constitute an approval for treatment. All parameters necessary to guide the delivery of RT Radiations are included.
This Instance is for validating or recording the patient-specific dose. For example, by delivering the RT Radiations to a phantom and comparing the calculated dose to the phantom with actual measurements made in the phantom.
This Instance is for performing or recording system quality assurance and calibration (geometric, dosimetric or both) procedures of the delivery machine and is not patient-specific.
This Instance is for performing or recording research and is not delivered to a patient.
This Instance is for performing or recording diagnostics, calibration or machine assessment by a service technician.
A treatment is defined by the RT Radiation Set SOP Instance whose RT Radiation Set Intent (300A,0637) value is TREATMENT. This value indicates that this RT Radiation Set is intended to be used for a treatment of the patient. The RT Radiation Set is sent to the treatment device and used for quality assurance without a patient being present. In this case, RT Radiation Set Usage (300A,0707) in the RT Radiation Record SOP Instance and the referenced RT Radiation Records have the value PLAN_QA. The same RT Radiation Set SOP Instance will be sent again to the treatment device for therapeutic radiation of a patient and then the RT Radiation Set Usage (300A,0707) of the SOP Instances recording the therapeutic radiation will contain the value TREATMENT.
All SOP Instances referenced in this Sequence shall:
share the same Frame of Reference (defined by the Frame of Reference UID (0020,0052) in the Frame of Reference Module), and
be defined for the same treatment device (specified by the Treatment Device Identification Macro within the RT Delivery Device Common Module).
The SOP Classes referenced in this Sequence shall contain the following Modules:
Radiation Instances that share a fixed spatial relation and thus can share the result of a position verification can be assigned to the same Treatment Position Group because the relationship of positions in one Instance to those in other Instances in the Treatment Position Group can be known with sufficient certainty to allow deterministic movement.
Whether it is reasonable to put Instances together in Treatment Position Group can depend on several factors and may involve a degree of judgment.
In a Radiation Set treating a single target with two beams at the same spatial location, both Radiation Instances belong to the same Treatment Position Group.
In a Radiation Set treating two targets in different anatomical regions (e.g., lung and pelvis), typically the Radiation Instances belong to different Treatment Position Groups, because a separate setup verification is required to establish the treatment position for each Radiation.
In a Radiation Set treating two targets whose spatial relationship is fixed such that a single setup verification is sufficient, the Radiation Instances may belong to the same Treatment Position Group, but the planner may choose to assign them to different Treatment Position Groups.
The values of Intended Number of Fractions (300A,0636) and the Attributes in Radiation Fraction Pattern Macro provide information about the planned treatment at the time the RT Radiation Set Instance was created.
| DICOM PS3.3 2024d - Information Object Definitions |
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