DICOM PS3.17 2020a - Explanatory Information

SS.3.3 Example 3: Colon Polyp Detection, Temporal Differencing With Findings (Current)
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### SS.3.3 Example 3: Colon Polyp Detection, Temporal Differencing With Findings

The patient in Example 2 returns for another colon radiograph. A more comprehensive colon CAD device processes the current colon radiograph, and analyses are performed that determine some temporally related content items for Composite Features. Portions of the prior colon CAD report (Example 2) are incorporated into this report. In the current colon radiograph the colon polyp has increased in size.

Figure SS.3-7. Colon radiographs as Described in Example 3

Node | Code Meaning of Concept Name | Code Meaning or Example Value | TID
--- | --- | --- | ---
1 | Colon CAD Report |  | TID 4120
1.1 | Language of Content Item and Descendants | English | TID 1204
1.2 | Image Set Properties |  | TID 4122
1.2.1 | Frame of Reference UID | 1.2.840.114191.5577 | TID 4122
1.2.2 | Study Instance UID | 1.2.840.114191.7788 | TID 4122
1.2.3 | Study Date | 20080924 | TID 4122
1.2.4 | Study Time | 101827 | TID 4122
1.2.5 | Modality | CT | TID 4122
1.2.6 | Horizontal Pixel Spacing | 0.80 mm | TID 4122
1.2.7 | Vertical Pixel Spacing | 0.80 mm | TID 4122
1.2.8 | Slice Thickness | 2.5 mm | TID 4122
1.2.9 | Spacing between slices | 1.5 mm | TID 4122
1.2.10 | Recumbent Patient Position with respect to gravity | Prone | TID 4122
1.3 | Image Set Properties |  | TID 4122
1.3.1 | Frame of Reference UID | 1.2.840.114191.1122 | TID 4122
1.3.2 | Study Instance UID | 1.2.840.114191.3344 | TID 4122
1.3.3 | Study Date | 20070924 | TID 4122
1.3.4 | Study Time | 090807 | TID 4122
1.3.5 | Modality | CT | TID 4122
1.3.6 | Horizontal Pixel Spacing | 0.80 mm | TID 4122
1.3.7 | Vertical Pixel Spacing | 0.80 mm | TID 4122
1.3.8 | Slice Thickness | 2.5 mm | TID 4122
1.3.9 | Spacing between slices | 1.5 mm | TID 4122
1.3.10 | Recumbent Patient Position with respect to gravity | Prone | TID 4122

The CAD processing and findings consist of one composite feature, comprised of single image findings, one from each year. The temporal relationship allows a quantitative temporal difference to be calculated:

Node | Code Meaning of Concept Name | Code Meaning or Example Value | TID
--- | --- | --- | ---
1.4 | CAD Processing and Findings Summary | All algorithms succeeded; with findings | TID 4121
1.4.1 | Composite Feature | Polyp | TID 4125
1.4.1.1 | Rendering Intent | Presentation Required: … | TID 4125
1.4.1.2 | Algorithm Name | "Polyp Change" | TID 4019
1.4.1.3 | Algorithm Version | "V2.3" | TID 4019
1.4.1.4 | Composite Type | Target content items are related temporally | TID 4126
1.4.1.5 | Scope of Feature | Feature detected on multiple images | TID 4126
1.4.1.6 | Certainty of Feature | 85% | TID 4126
1.4.1.7 | Associated Morphology | Pedunculated | TID 4128
1.4.1.8 | Difference in size | 2 mm | TID 4126
1.4.1.8.1 |  | Reference to Node 1.4.1.9.10 | TID 4126
1.4.1.8.2 |  | Reference to Node 1.4.1.10.10 | TID 4126
1.4.1.9 | Composite Feature | Polyp | TID 4125
1.4.1.9.1 | Rendering Intent | Presentation Required: … | TID 4125
1.4.1.9.2 | Tracking Identifier | "Watchlist #1" | TID 4108
1.4.1.9.3 | Algorithm Name | "Colon Polyp Detector" | TID 4019
1.4.1.9.4 | Algorithm Version | "V1.3" | TID 4019
1.4.1.9.5 | Composite Type | Target content items are related spatially | TID 4126
1.4.1.9.6 | Scope of Feature | Feature detected on multiple images | TID 4126
1.4.1.9.7 | Center | SCOORD3D POINT | TID 4129
1.4.1.9.8 | Outline | SCOORD3D ELLIPSE | TID 4129
1.4.1.9.9 | Associated Morphology | Pedunculated | TID 4128
1.4.1.9.10 | Diameter | 4 mm | TID 1406
1.4.1.9.10.1 | Path | SCOORD3D POLYLINE | TID 1406
1.4.1.10 | Composite Feature | Polyp | TID 4125
1.4.1.10.1 | Rendering Intent | Presentation Required: … | TID 4125
1.4.1.10.2 | [Observation Context content items] |  | TID 4022
1.4.1.10.3 | Algorithm Name | "Colon Polyp Detector" | TID 4019
1.4.1.10.4 | Algorithm Version | "V1.3" | TID 4019
1.4.1.10.5 | Composite Type | Target content items are related spatially | TID 4126
1.4.1.10.6 | Scope of Feature | Feature detected on multiple images | TID 4126
1.4.1.10.7 | Center | SCOORD3D POINT | TID 4129
1.4.1.10.8 | Outline | SCOORD3D ELLIPSE | TID 4129
1.4.1.10.9 | Associated Morphology | Pedunculated | TID 4128
1.4.1.10.10 | Diameter | 2 mm | TID 1406
1.4.1.10.10.1 | Path | SCOORD3D POLYLINE | TID 1406
1.5 | Summary of Detections | Succeeded | TID 4120
1.5.1 | Successful Detections |  | TID 4015
1.5.1.1 | Detection Performed | Polyp | TID 4017
1.5.1.1.1 | Algorithm Name | "Colon Polyp Detector" | TID 4019
1.5.1.1.2 | Algorithm Version | "V1.3" | TID 4019
1.5.1.1.3 | Series Instance UID | 1.2.840.114191.555666 | TID 4017
1.6 | Summary of Analyses | Succeeded | TID 4120
1.6.1 | Successful Analyses |  | TID 4016
1.6.1.1 | Analysis Performed | "Temporal correlation" | TID 4018
1.6.1.1.1 | Algorithm Name | "Polyp Change" | TID 4019
1.6.1.1.2 | Algorithm Version | "V2.3" | TID 4019
1.6.1.1.3 | Series Instance UID | 1.2.840.114191.111222 | TID 4018
1.6.1.1.4 | Series Instance UID | 1.2.840.114191.555666 | TID 4018

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DICOM PS3.17 2020a - Explanatory Information