Материал: part17

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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,areinsertedby-valueinthenewSRobjectinstance,withappropriateoriginalsourceobservationcontext.Itisnecessarytoupdate​ RenderingIntent,andreferencedcontentitemidentifiersforby-referencerelationships,withincontentitemsparaphrasedfromanother​ source.​

Document Root

(CONTAINER)

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 De-​ tections 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.​

OnceaSingleImageFindingorCompositeFeaturehasbeeninstantiated,itmaybereferencedbyanynumberofCompositeFeatures​ higher in the CAD Processing and Findings Summary sub-tree.​

SS.2 Colon CAD SR Observation Context Encoding​

AnycontentitemintheContenttreethathasbeeninserted(i.e.,duplicated)fromanotherSRobjectinstancehasaHASOBSCONTEXT​ relationship to one or more content items that describe the context of the SR object instance from which it originated. This mechanism​ may be used to combine reports (e.g., Colon CAD SR 1, Colon CAD SR 2, Human).​

TheCADProcessingandFindingsSummarysectionoftheSRDocumentContenttreeofaColonCADSRIODmaycontainamixture​ ofcurrentandpriorsingleimagefindingsandcompositefeatures.Thecontentitemsfromcurrentandpriorcontextsaretargetcontent​ items that have a by-value INFERRED FROM relationship to a Composite Feature content item. Content items that come from a​ context other than the Initial Observation Context have a HAS OBS CONTEXT relationship to target content items that describe the​ context of the source document.​

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In Figure SS.2-1, Composite Feature and Single Image Finding are current, and Single Image Finding (from Prior) is duplicated from​ a prior document.​

Composite Feature

(CODE)

Source Document

Context Info

Figure SS.2-1. Example of Use of Observation Context​

SS.3 Colon CAD SR Examples​

The following is a simple and non-comprehensive illustration of an encoding of the Colon CAD SR IOD for colon computer aided de-​ tection results. For brevity, some mandatory content items are not included.​

SS.3.1 Example 1: Colon Polyp Detection With No Findings​

A colon CAD device processes a typical screening colon case, i.e., there are several hundred images and no polyp findings. Colon​ CAD runs polyp detection successfully and finds nothing.​

The colon radiograph resembles:​

Colon CT Slice

Figure SS.3-1. Colon Radiograph as Described in Example 1​

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SS.3.2 Example 2: Colon Polyp Detection With Findings​

AcolonCADdeviceprocessesascreeningcoloncasewithseveralhundredimages,andacolonpolypdetected.Thecolonradiograph​ resembles:​

Colon CT Slice

Figure SS.3-2. Colon radiograph as Described in Example 2​

The content tree structure in this example is complex. Structural illustrations of portions of the content tree are placed within the​ content tree table to show the relationships of data within the tree. Some content items are duplicated (and shown in boldface) to fa-​ cilitate use of the diagrams.​

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COLON CAD REPORT (CONTAINER)

Figure SS.3-3. Content Tree Root of Example 2 Content Tree​

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