DICOM PS3.17 2020b - Explanatory Information

RRR.2 Measurement Report SR Document Volumetric ROI on CT Example (Current)
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## RRR.2 Measurement Report SR Document Volumetric ROI on CT Example

This CT example describes a set of measurements (volume. long axis and mean attenuation coefficient) made from a single volumetric ROI encoded as a single segment that spans two source CT images, and includes a description of the measurement methods and the finding site, as well as an image library to describe characteristics of the images used, and categorical observations at the measurement group and entire subject level.

### Note

1. For a different modality than CT, the choice of measurement for the mean intensity would not be (122713, DCM, "Attenuation Coefficient").

2. For MR one might use (110852, DCM, "MR signal intensity"), or (110804, DCM, "T1 Weighted MR Signal Intensity"), etc. See also CID 7180 “Abstract Multi-dimensional Image Model Component Semantics” for various appropriate signal intensity types for MR and other modalities.

3. For PET one might use (110821, DCM, "Nuclear Medicine Tomographic Activity"), in which case the specific type of signal would be apparent from the units, e.g., ({SUVbw}g/ml, UCUM, "Standardized Uptake Value body weight") or for activity-concentration, (Bq/ml, UCUM, "Becquerels/milliliter"). See also CID 84 “PET Units”.

4. Care should be taken when selecting modifiers such as (370129005, SCT, "Measurement Method") versus (121401, DCM, "Derivation").

5. The finding site and laterality within the measurement template (TID 1419 “ROI Measurements”) are factored out and shared by both measurements.

6. The pattern used for the image library uses TID 4020 “CAD Image Library Entry”, though commonality may be refactored.

7. The length of the long axis of the volumetric ROI is encoded, but the end points of the line segment used to make that measurement are not recorded, since only the volumetric spatial description of TID 1411 is used. For an alternative encoding, see Section RRR.5.

Table RRR.2-1. Volumetric ROI on CT Example

Node | Code Meaning of Concept Name | Code Meaning or Example Value | TID
--- | --- | --- | ---
1 | Oncology Measurement Report |  | TID 1500
1.1 | Language of Content Item and Descendants | English | TID 1204
1.2 | Observation Context |  | TID 1001
1.2.1 | Person Observer Name | Doe^Jane | TID 1003
1.3 | Procedure Reported | Chest+Abd CT W+WO contr IV | TID 1500
1.4 | Image Library |  | TID 1500
1.4.1 |  | IMAGE - CT image #1 | TID 4020
1.4.1.1 | Study Date | 20030417 | TID 4020
1.4.1.2 | Study Time | 104607 | TID 4020
1.4.1.3 | Horizontal Pixel Spacing | 0.810547 mm | TID 4020
1.4.1.j | ... | ... | TID 4020
1.4.1.n | Pixel Data Columns | 512 pixels | TID 4020
1.4.2 |  | IMAGE - CT image #2 | TID 4020
1.4.2.j | ... | ... | TID 4020
1.5 | Measurements |  | TID 1500
1.5.1 | Measurement Group |  | TID 1411
1.5.1.1 | Tracking Identifier | Object1 | TID 1411
1.5.1.2 | Tracking Unique Identifier | 1.2.276.0.7230010... | 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 | TID 1419
1.5.1.6.1 | Laterality | Right | 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 | Long Axis | 9.21 mm | TID 1419 CID 7470
1.5.1.8.1 | Measurement Method | RECIST 1.1 | TID 1419 CID 6147
1.5.1.9 | Attenuation Coefficient | 70.978 Hounsfield unit | TID 1419
1.5.1.9.1 | Derivation | Mean | TID 1419 CID 7464
1.5.1.10 | Necrosis | Present | TID 1419
1.5.1.11 | Hemorrhage | Absent | TID 1419
1.6 | Qualitative Evaluations |  | TID 1500
1.6.1 | Renal Vein Involvement | Absent | TID 1500

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DICOM PS3.17 2020b - Explanatory Information