DICOM PS3.3 2021c - Information Object Definitions

C.36.2.2.17 RT Tolerance Set Macro (Current)
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##### C.36.2.2.17 RT Tolerance Set Macro

The RT Tolerance Set Macro contains information describing the maximum differences between planned and delivered values. This information is used in the context of delivery of the RT Radiation Set. If the absolute difference between a planned and delivered value exceeds the tolerance value, then it is expected that the delivery of the RT Radiation Set will be inhibited unless an authorized operator confirms that the tolerance may be exceeded.

Table C.36.2.2.17-1. RT Tolerance Set Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
RT Tolerance Set Label | (300A,062A) | 1 | User defined label for the Tolerance Set.
Attribute Tolerance Values Sequence | (300A,062B) | 2 | Tolerance values representing the allowed difference between the planned and actual values. The Selector Attribute Macro identifies the Attributes for which the tolerances are specified. Required if a tolerance value is specified for at least one Attribute which can be referenced by the Selector Attribute Macro. See Section C.36.2.2.17.1.1. Zero or more Items shall be included in this Sequence.
>Include Table 10-20 “Selector Attribute Macro Attributes”.
>Tolerance Value | (300A,062C) | 1 | Maximum permitted difference between the planned and the delivered value. Units are those specified for the corresponding Attribute referenced by the Selector Attribute Macro.
Patient Support Position Specification Method | (300A,065C) | 1 | Method of specification for patient support parameters. Enumerated Values: ABSENT No parameters are specified. GLOBAL Parameters are specified irrespective of the devices in use. DEVICE_SPECIFIC Parameters are specified per device.
Patient Support Position Device Tolerance Sequence | (300A,0660) | 1C | Tolerance values for Patient Support devices. Required if Patient Support Position Specification Method (300A,065C) does not equal ABSENT. One or more Items shall be included in this Sequence if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. Only one Item shall be included in this Sequence if Patient Support Position Specification Method (300A,065C) equals GLOBAL. See Section C.36.2.2.17.1.2.
>Referenced Device Index | (300A,0607) | 1C | The value of Device Index (3010,0039) in Patient Support Devices Sequence (300A,0686) corresponding to the Patient Support Device in use. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC.
>Device Order Index | (300A,065E) | 1C | Index defining the order in which the Items in the Patient Support Position Device Tolerance Sequence (300A,0660) are applied. The value shall start at 1 and increase monotonically by 1. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. See Section 10.40.1.
>Patient Support Position Tolerance Sequence | (300A,062D) | 1 | Tolerance values for a particular Patient Support device. One or more Items shall be included in this Sequence.
>>Patient Support Position Tolerance Order Index | (300A,0661) | 1C | Index defining the order in which the Items in the Patient Support Position Tolerance Sequence (300A,062D) are applied. The value shall start at 1 and increase monotonically by 1. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. See Section 10.40.1.
>>Include Table 10-2 “Content Item Macro Attributes Description”. | BTID 15302 “Patient Support Position Parameters”. Content items shall use UCUM units of mm and degrees where applicable.

###### C.36.2.2.17.1 RT Tolerance Set Attribute Description

###### C.36.2.2.17.1.1 Attribute Tolerance Values Sequence

The Attribute Tolerance Values Sequence (300A,062B) allows for the reference to any numerical parameter in an RT Radiation IOD. The RT Tolerance Set Macro is invoked to specify a tolerance value for this parameter. The reference specification is conveyed by the Selector Attribute Macro, which allows reference to a tag on any level of nested Sequences, and to refer to specific Items in the Sequence. The unit of the tolerance value is the unit as specified by the data element tag referenced in the Selector Attribute (0072,0026).

###### C.36.2.2.17.1.2 Patient Support Position Tolerance Sequence

When describing a tolerance for a specific patient support position value, the patient support device parameter is defined using the same code used in the Patient Support Position Macro in Section 10.40.

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DICOM PS3.3 2021c - Information Object Definitions