PS-2020a / part17

In this pipeline the different classifications for the segmented objects are shown, followed by the blending operations. To visualize​ the vessels, they are first classified with a special transfer function and then blended over the background image. The segmented​ Tumor is also classified and then blended over the Vessels + Bones. Generally the classified segmented volumes are blended in​ lowest to highest priority order using B-over-A blending of the RGB data and the corresponding opacity (alpha) data.​

XXX.3.11.3 Encoding Details​

XXX.3.11.3.1 Volumetric Presentation State Relationship Module Recommendations​

Table XXX.3.11.3.1-1. Volumetric Presentation State Relationship Module Recommendations​

XXX.3.11.3.2 Volume Render Geometry Module Recommendations​

Table XXX.3.11.3.2-1. Volume Render Geometry Module Recommendations​

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XXX.3.11.3.3 Render Shading Module Recommendations​

Table XXX.3.11.3.3-1. Render Shading Module Recommendations​

XXX.3.11.3.4 Render Display Module Recommendations​

Table XXX.3.11.3.4-1. Render Display Module Recommendations​

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XXX.3.12 Liver Resection Planning​

XXX.3.12.1 User Scenario​

A patient has been imaged by CT at arterial and portal venous contrast phases in order to plan for a liver resection. The two phases​ are rendered together to visualize the relationship of the tumor to the portal vein, hepatic veins and hepatic arteries to ensure the re-​ section avoids these structures.​

Figure XXX.3.12-1. Liver Resection Planning Pipeline​

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XXX.3.12.2 Encoding Outline​

Figure XXX.3.12-2. Multiple Volume Rendering Pipeline​

Inthispipeline,volumestreamsfromtwovolumeinputsareblendedtogether.Fromthearterialphasevolumeinput,segmentedviews​ of the liver, tumor and hepatic arteries are blended in sequence (B over A). From the venous phase volume input, segmented views​ of the hepatic veins and the portal vein are blended in sequence (B over A). Outputs from these operations are blended together with​ both given equal weight.​

XXX.3.12.3 Encoding Details​

XXX.3.12.3.1 Volumetric Presentation State Relatonship Module Recommendations​

Table XXX.3.12.3.1-1. Volumetric Presentation State Relatonship Module Recommendations​

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XXX.3.12.3.3 Volume Cropping Module Recommendations​

Table XXX.3.12.3.3-1. Volume Cropping Module Recommendations​

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XXX.4 Uses of Presentation View Description in the Identification Module​

XXX.4.1 Hanging Protocols​

A Hanging Protocol Instance could select a set of orthogonal MPRs by use of the Image Sets Sequence (0072,0020).​

Table XXX.4.1-1. Hanging Protocol Image Set Sequence Recommendations​

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ThedisplayapplicationwouldlookforthreePlanarMPRVolumetricPresentationStates-oneCoronal,oneSagittalandoneTransverse​ - and associate them with Image Sets in the view.​

XXX.4.2 Structured Displays​

AStructuredDisplayInstancecouldselectasetofoneormoreVolumetricPresentationStatesbydefininganimageboxwhoseImage​ Box Layout Type (0072,0304) has a Value of "VOLUME_VIEW" or "VOLUME_CINE" and by specifying one or more Volumetric​ PresentationStatesusingtheReferencedPresentationStateSequence(seeTableC.11.17-1“StructuredDisplayImageBoxModule​ Attributes” in PS3.3).​

XXX.4.3 Ad Hoc Display Layout​

Layout could be accomplished in a display application by using the Presentation Display Collection UID (0070,1101) to identify the​ presentations to be displayed together, and the View Code Sequence (0054,0220) to determine which presentation to display in each​ displayslot.Thisrequiressomeclinicalcontextattheexamlevel,whichcanbeobtainedfromthesourceimages(forexample,Performed​ Protocol Code Sequence (0040,0260) ).​

XXX.5 Compositing and the Use of Weighting Transfer Functions​

TheRGBCompositordescribedinSectionFF.2.3.3.2“InternalStructureofRGBandRGBACompositorComponents”inPS3.4utilizes​ twoweightingtransferfunctionsofAlpha-1andAlpha-2tocontroltheCompositorFunction,allowingcompositingfunctionsthatwould​ notbepossibleifeachweightingfactorwerebasedonlyonthatinput'sAlphavalue.Theseweightingtransferfunctionsareimplemented​ as Weighting Look-Up Tables (LUTs). Several examples of the use of these Weighting LUTs are described in this section. The format​ of the examples is in the form of a graph whose horizontal axis is the Alpha-1 input value and whose vertical axis is the Alpha-2 input​ value. The Weight output value is represented as a gray level, where 0.0=black and 1.0=white.​

Section XXX.3 references these different weighting function styles from real clinical use cases.​

XXX.5.1 Fixed Proportional Compositing​

In this example, a fixed proportion (in this case 2/3) of RGB-1 is added to a fixed proportion (in this case 1/3) of RGB-2. Note that the​ weighting factors are independent of Alpha values in this case:​

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Weight Output Scale

0.01.0

Figure XXX.5-1. Weighting LUTs for Fixed Proportional Composting​

XXX.5.2 Partially Transparent A Over B Compositing​

In this example, the Compositor Component performs a Porter-Duff "Partially Transparent A over B" compositing.​

Weight Output Scale

0.01.0

Figure XXX.5-2. Weighting LUTs for Partially Transparent A Over B Compositing​

XXX.5.3 Pass-through Compositing​

In this example, each channel's Alpha value becomes the weighting factor for that channel.​

Weight Output Scale

0.01.0

Figure XXX.5-3. Weighting LUTs for Pass-Through Compositing​

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