C.8.8.10 RT Prescription Module
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#### C.8.8.10 RT Prescription Module

Table C.8-46. RT Prescription Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Prescription Description | (300A,000E) | 3 | User-defined description of treatment prescription.
Dose Reference Sequence | (300A,0010) | 3 | Sequence of Dose References. One or more items are permitted in this sequence.
>Dose Reference Number | (300A,0012) | 1 | Identification number of the Dose Reference. The value of Dose Reference Number (300A,0012) shall be unique within the RT Plan in which it is created.
>Dose Reference UID | (300A,0013) | 3 | A unique identifier for a Dose Reference that can be used to link the same entity across multiple RT Plan objects.
>Dose Reference Structure Type | (300A,0014) | 1 | Structure type of Dose Reference. Defined Terms: POINT dose reference point specified as ROI VOLUME dose reference volume specified as ROI COORDINATES point specified by Dose Reference Point Coordinates (300A,0018) SITE dose reference clinical site
>Dose Reference Description | (300A,0016) | 3 | User-defined description of Dose Reference.
>Referenced ROI Number | (3006,0084) | 1C | Uniquely identifies ROI representing the dose reference specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set in Referenced Structure Set Sequence (300C,0060) in RT General Plan Module. Required if Dose Reference Structure Type (300A,0014) is POINT or VOLUME.
>Dose Reference Point Coordinates | (300A,0018) | 1C | Coordinates (x,y,z) of Reference Point in the patient based coordinate system described in Section C.7.6.2.1.1 (mm). Required if Dose Reference Structure Type (300A,0014) is COORDINATES.
>Nominal Prior Dose | (300A,001A) | 3 | Dose (in Gy) from prior treatment to this Dose Reference (e.g., from a previous course of treatment).
>Dose Reference Type | (300A,0020) | 1 | Type of Dose Reference. Defined Terms: TARGET treatment target (corresponding to GTV, PTV, or CTV in ICRU50) ORGAN_AT_RISK Organ at Risk (as defined in ICRU50)
>Constraint Weight | (300A,0021) | 3 | Relative importance of satisfying constraint, where high values represent more important constraints.
>Delivery Warning Dose | (300A,0022) | 3 | The dose (in Gy) that when reached or exceeded should cause some action to be taken.
>Delivery Maximum Dose | (300A,0023) | 3 | The maximum dose (in Gy) that can be delivered to the dose reference.
>Target Minimum Dose | (300A,0025) | 3 | Minimum permitted dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) is TARGET.
>Target Prescription Dose | (300A,0026) | 3 | Prescribed dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) is TARGET.
>Target Maximum Dose | (300A,0027) | 3 | Maximum permitted dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) is TARGET.
>Target Underdose Volume Fraction | (300A,0028) | 3 | Maximum permitted fraction (in percent) of Target to receive less than the Target Prescription Dose if Dose Reference Type (300A,0020) is TARGET and Dose Reference Structure Type (300A,0014) is VOLUME. See Section C.8.8.10.1.
>Organ at Risk Full-volume Dose | (300A,002A) | 3 | Maximum dose (in Gy) to entire Dose Reference if Dose Reference Type (300A,0020) is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) is VOLUME.
>Organ at Risk Limit Dose | (300A,002B) | 3 | Maximum permitted dose (in Gy) to any part of Dose Reference if Dose Reference Type (300A,0020) is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) is VOLUME.
>Organ at Risk Maximum Dose | (300A,002C) | 3 | Maximum dose (in Gy) to non-overdosed part of Dose Reference if Dose Reference Type (300A,0020) is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) is VOLUME.
>Organ at Risk Overdose Volume Fraction | (300A,002D) | 3 | Maximum permitted fraction (in percent) of the Organ at Risk to receive more than the Organ at Risk Maximum Dose if Dose Reference Type (300A,0020) is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) is VOLUME.

##### C.8.8.10.1 Target Underdose Volume Fraction

If the Target Underdose Volume Fraction (300A,0028) is not present, it shall be interpreted as zero.

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