DICOM PS3.3 2018a - Information Object Definitions

C.8.8.24 RT Ion Tolerance Tables Module
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#### C.8.8.24 RT Ion Tolerance Tables Module

The RT Ion Tolerance Tables Module contains information describing the maximum allowed differences between the planned and measured attributes for Ion therapy.

Table C.8.8.24-1. RT Ion Tolerance Tables Module Attributes

Attribute Name | Tag | Type | Description
--- | --- | --- | ---
Ion Tolerance Table Sequence | (300A,03A0) | 1 | Sequence of ion tolerance tables to be used for delivery of treatment plan. One or more Items shall be included in this Sequence. See Note 1.
>Tolerance Table Number | (300A,0042) | 1 | Identification number of the Tolerance Table. The value of Tolerance Table Number (300A,0042) shall be unique within the RT Ion Plan in which it is created.
>Tolerance Table Label | (300A,0043) | 3 | User-defined label for Tolerance Table.
>Gantry Angle Tolerance | (300A,0044) | 3 | Maximum permitted difference (in degrees) between planned and delivered Gantry Angle.
>Beam Limiting Device Angle Tolerance | (300A,0046) | 3 | Maximum permitted difference (in degrees) between planned and delivered Beam Limiting Device Angle.
>Beam Limiting Device Tolerance Sequence | (300A,0048) | 3 | Sequence of beam limiting device (collimator) tolerances. One or more Items are permitted in this Sequence.
>>RT Beam Limiting Device Type | (300A,00B8) | 1 | Type of beam limiting device (collimator). Enumerated Values: X symmetric jaw pair in IEC X direction Y symmetric jaw pair in IEC Y direction ASYMX asymmetric jaw pair in IEC X direction ASYMY asymmetric pair in IEC Y direction MLCX multileaf (multi-element) jaw pair in IEC X direction MLCY multileaf (multi-element) jaw pair in IEC Y direction
>>Beam Limiting Device Position Tolerance | (300A,004A) | 1 | Maximum permitted difference (in mm) between planned and delivered leaf (element) or jaw positions for current beam limiting device (collimator).
>Patient Support Angle Tolerance | (300A,004C) | 3 | Maximum permitted difference (in degrees) between planned and delivered Patient Support Angle.
>Table Top Vertical Position Tolerance | (300A,0051) | 3 | Maximum permitted difference (in mm) between planned and delivered Table Top Vertical Position.
>Table Top Longitudinal Position Tolerance | (300A,0052) | 3 | Maximum permitted difference (in mm) between planned and delivered Table Top Longitudinal Position.
>Table Top Lateral Position Tolerance | (300A,0053) | 3 | Maximum permitted difference (in mm) between planned and delivered Table Top Lateral Position.
>Table Top Pitch Angle Tolerance | (300A,004F) | 3 | Maximum permitted difference (in degrees) between planned and delivered Table Top Pitch Angle.
>Table Top Roll Angle Tolerance | (300A,0050) | 3 | Maximum permitted difference (in degrees) between planned and delivered Table Top Roll Angle.
>Snout Position Tolerance | (300A,004B) | 3 | Maximum permitted difference (in mm) between planned and delivered Snout Position.
>Head Fixation Angle Tolerance | (300A,0152) | 3 | Maximum permitted difference (in degrees) between planned and delivered Head Fixation Angle (300A,0148).
>Chair Head Frame Position Tolerance | (300A,0153) | 3 | Maximum permitted difference (in mm) between planned and delivered Chair Head Frame Position (300A,0151).
>Fixation Light Azimuthal Angle Tolerance | (300A,0154) | 3 | Maximum permitted difference (in degrees) between planned and delivered Fixation Light Azimuthal Angle (300A,0356).
>Fixation Light Polar Angle Tolerance | (300A,0155) | 3 | Maximum permitted difference (in mm) between planned and delivered Fixation Light Polar Angle (300A,0358).

Note 1: Tolerance Tables may be used to compare planned values to actual machine values. If the absolute difference between the planned and actual values exceeds the Tolerance Table value, treatment may be inhibited or the operator may be warned.

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DICOM PS3.3 2018a - Information Object Definitions