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.

PRIOR COLON CT SLICE [pic]
CURRENT COLON CT SLICE [pic]

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 4120
1.1 Language of Content Item and Descendants English 1204
1.2 Image Set Properties 4122
1.2.1 Frame of Reference UID 1.2.840.114191.5577 4122
1.2.2 Study Instance UID 1.2.840.114191.7788 4122
1.2.3 Study Date 20080924 4122
1.2.4 Study Time 101827 4122
1.2.5 Modality CT 4122
1.2.6 Horizontal Pixel Spacing 0.80 mm 4122
1.2.7 Vertical Pixel Spacing 0.80 mm 4122
1.2.8 Slice Thickness 2.5 mm 4122
1.2.9 Spacing between slices 1.5 mm 4122
1.2.10 Recumbent Patient Position with respect to gravity Prone 4122
1.3 Image Set Properties 4122
1.3.1 Frame of Reference UID 1.2.840.114191.1122 4122
1.3.2 Study Instance UID 1.2.840.114191.3344 4122
1.3.3 Study Date 20070924 4122
1.3.4 Study Time 090807 4122
1.3.5 Modality CT 4122
1.3.6 Horizontal Pixel Spacing 0.80 mm 4122
1.3.7 Vertical Pixel Spacing 0.80 mm 4122
1.3.8 Slice Thickness 2.5 mm 4122
1.3.9 Spacing between slices 1.5 mm 4122
1.3.10 Recumbent Patient Position with respect to gravity Prone 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 4121
1.4.1 Composite Feature Polyp 4125
1.4.1.1 Rendering Intent Presentation Required: … 4125
1.4.1.2 Algorithm Name “Polyp Change” 4019
1.4.1.3 Algorithm Version “V2.3 4019
1.4.1.4 Composite Type Target content items are related temporally 4126
1.4.1.5 Scope of Feature Feature detected on multiple images 4126
1.4.1.6 Certainty of Feature 85% 4126
1.4.1.7 Associated Morphology Pedunculated 4128
1.4.1.8 Difference in size 2 mm 4126
1.4.1.8.1 Reference to Node 1.4.1.9.10 4126
1.4.1.8.2 Reference to Node 1.4.1.10.10 4126
1.4.1.9 Composite Feature Polyp 4125
1.4.1.9.1 Rendering Intent Presentation Required: … 4125
1.4.1.9.2 Tracking Identifier “Watchlist #1” 4108
1.4.1.9.3 Algorithm Name “Colon Polyp Detector” 4019
1.4.1.9.4 Algorithm Version “V1.3 4019
1.4.1.9.5 Composite Type Target content items are related spatially 4126
1.4.1.9.6 Scope of Feature Feature detected on multiple images 4126
1.4.1.9.7 Center SCOORD3D POINT 4129
1.4.1.9.8 Outline SCOORD3D ELLIPSE 4129
1.4.1.9.9 Associated Morphology Pedunculated 4128
1.4.1.9.10 Diameter 4 mm 1406
1.4.1.9.10.1 Path SCOORD3D POLYLINE 1406
1.4.1.10 Composite Feature Polyp 4125
1.4.1.10.1 Rendering Intent Presentation Required: … 4125
1.4.1.10.2 [Observation Context content items] 4022
1.4.1.10.3 Algorithm Name “Colon Polyp Detector” 4019
1.4.1.10.4 Algorithm Version “V1.3 4019
1.4.1.10.5 Composite Type Target content items are related spatially 4126
1.4.1.10.6 Scope of Feature Feature detected on multiple images 4126
1.4.1.10.7 Center SCOORD3D POINT 4129
1.4.1.10.8 Outline SCOORD3D ELLIPSE 4129
1.4.1.10.9 Associated Morphology Pedunculated 4128
1.4.1.10.10 Diameter 2 mm 1406
1.4.1.10.10.1 Path SCOORD3D POLYLINE 1406
1.5 Summary of Detections Succeeded 4120
1.5.1 Successful Detections 4015
1.5.1.1 Detection Performed Polyp 4017
1.5.1.1.1 Algorithm Name “Colon Polyp Detector” 4019
1.5.1.1.2 Algorithm Version “V1.3 4019
1.5.1.1.3 Series Instance UID 1.2.840.114191.555666 4017
1.6 Summary of Analyses Succeeded 4120
1.6.1 Successful Analyses 4016
1.6.1.1 Analysis Performed “Temporal correlation” 4018
1.6.1.1.1 Algorithm Name “Polyp Change” 4019
1.6.1.1.2 Algorithm Version “V2.3 4019
1.6.1.1.3 Series Instance UID 1.2.840.114191.111222 4018
1.6.1.1.4 Series Instance UID 1.2.840.114191.555666 4018