DICOM PS3.17 2020c - Explanatory Information

RRR.5 Measurement Report SR Document Volumetric ROI with RECIST Linear Distance Specified by Coordinates on CT Example (Current)
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## RRR.5 Measurement Report SR Document Volumetric ROI with RECIST Linear Distance Specified by Coordinates on CT Example

This CT example describes a set of measurements (volume, long axis (RECIST), short axis (WHO bi-dimensional) and mean attenuation coefficient) made from a single volumetric ROI encoded as a single segment, including specification of the end points of the line segment used to make the linear distance measurements.

### Note

1. The lengths of the long axis and the short axis of the lesion are not encoded as characteristics of the volumetric ROI, but rather the long axis and the short axis are encoded explicitly as the end points of line segments used to make those measurements. The commonality of the Tracking Unique Identifier establishes that they are measurements of the same ROI. If multiple measurements were to be made of the same ROI over time or by different observers, other content items such as those related to Timepoint, Activity Session and Observer may be used. For an alternative encoding, see Section RRR.2.

2. The pattern of using multiple sibling linear distance measurements within TID 1419 “ROI Measurements” is similar to and not incompatible with the pattern used for length, width and height in the OB/GYN Ultrasound template TID 5016 “LWH Volume Group”.

3. The Finding Site information is duplicated in the second measurement template invocation in this example, though it is not required to be.

Table RRR.5-1. Volumetric ROI on CT Example

Node | Code Meaning of Concept Name | Code Meaning or Example Value | TID
--- | --- | --- | ---
1 | Oncology Measurement Report |  | TID 1500
... | ... | ... | ...
1.5 | Measurements |  | TID 1500
1.5.1 | Measurement Group |  | TID 1411
1.5.1.1 | Tracking Identifier | Object1 (same for both Measurement Groups) | TID 1411
1.5.1.2 | Tracking Unique Identifier | 1.2.276.0.7230010... (same for both Measurement Groups) | TID 1411
1.5.1.3 | Referenced Segment | IMAGE - Segmentation, Segment #1 | TID 1411
1.5.1.4 | Source image for segmentation | IMAGE - CT image #1 | TID 1411
1.5.1.5 | Source image for segmentation | IMAGE - CT image #2 | TID 1411
1.5.1.6 | Finding Site | Adrenal Gland (same for both Measurement Groups) | TID 1419
1.5.1.6.1 | Laterality | Right (same for both Measurement Groups) | TID 1419
1.5.1.7 | Volume | 3267.46 mm3 | TID 1419
1.5.1.7.1 | Measurement Method | Sum of segmented voxel volumes | TID 1419 CID 7474
1.5.1.8 | Attenuation Coefficient | 70.978 Hounsfield unit | TID 1419
1.5.1.8.1 | Derivation | Mean | TID 1419 CID 7464
1.6.1 | Measurement Group |  | TID 1501
1.6.1.1 | Tracking Identifier | Object1 (same for both Measurement Groups) | TID 1501
1.6.1.2 | Tracking Unique Identifier | 1.2.276.0.7230010... (same for both Measurement Groups) | TID 1501
1.6.1.3 | Finding Site | Adrenal Gland (same for both Measurement Groups) | TID 1501
1.6.1.3.1 | Laterality | Right (same for both Measurement Groups) | TID 1501
1.6.1.4 | Long Axis | 9.21 mm | TID 300 CID 7470
1.6.1.4.1 | Measurement Method | RECIST 1.1 | TID 300 CID 6147
1.6.1.4.2 | Source of Measurement | SCOORD GraphicType POLYLINE with two coordinates, the beginning and end of a line segment | TID 320 CID 7470
1.6.1.4.2.1 | (none) | IMAGE - CT image #1 | TID 320
1.6.1.5 | Short Axis | 6.8 mm | TID 300 CID 7470
1.6.1.5.1 | Measurement Method | WHO | TID 300 CID 6147
1.6.1.5.2 | Source of Measurement | SCOORD GraphicType POLYLINE with two coordinates, the beginning and end of a line segment | TID 320 CID 7470
1.6.1.5.2.1 | (none) | IMAGE - CT image #1 | TID 320

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DICOM PS3.17 2020c - Explanatory Information