DICOM PS3.17 2018a - Explanatory Information

SS Colon CAD (Informative)
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# SS Colon CAD (Informative)

## SS.1 Colon CAD SR Content Tree Structure

The templates for the Colon CAD SR IOD are defined in Colon CAD SR IOD Templates in PS3.16 . All relationships defined in the Colon CAD SR IOD templates are by-value. Content items referenced from another SR object instance, such as a prior Colon CAD SR, are inserted by-value in the new SR object instance, with appropriate original source observation context. It is necessary to update Rendering Intent, and referenced content item identifiers for by-reference relationships, within content items paraphrased from another source.

Figure SS.1-1. Top Levels of Colon CAD SR Content Tree

The Document Root, Image Set Properties, CAD Processing and Findings Summary, and Summaries of Detections and Analyses sub-trees together form the content tree of the Colon CAD SR IOD. See Annex E for additional explanation of the Summaries of Detections and Analyses sub-trees.

The identification of a polyp within an image set is considered to be a Detection. The temporal correlation of a polyp in two image sets taken at different times is considered Analysis. This distinction is used in determining whether to place algorithm identification information in the Summary of Detections or Summary of Analyses sub-trees.

Once a Single Image Finding or Composite Feature has been instantiated, it may be referenced by any number of Composite Features higher in the CAD Processing and Findings Summary sub-tree.

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DICOM PS3.17 2018a - Explanatory Information