Материал: part17

XXX.5.4 Threshold Compositing​

In this example, the Alpha values are specified to be representative of the magnitude of the corresponding input data, and the​ weighting tables are designed such that the stronger of the two inputs are output at each point. If Alpha-2 is less than Alpha-1 then​ the output consists solely of RGB-1, while if Alpha-2 is greater than Alpha-1 then the output consists solely of RGB-2. This approach​ is common with ultrasound tissue intensity + flow velocity images, where each output pixel would be either a grayscale tissue value​ if the flow value is less than the tissue value or a colorized flow velocity value if the flow value is greater than the tissue value:​

Weight Output Scale

0.01.0

Figure XXX.5-4. Weighting LUTs for Threshold Composting​

XXX.6 Usage of the Classification and Compositing Components​

With these components, blending operations such as the following are possible:​ •​One input to P-Values output:​

•​Pixel Presentation (0008,9205) has a value of MONOCHROME​

Figure XXX.6-1. One Input To P-Values Output​

•​One input to PCS-Values output:​

•​Pixel Presentation (0008,9205) has a value of TRUE_COLOR​

•​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​

Figure XXX.6-2. One Input to PCS-Values Output​

•​Two inputs to PCS-Values output:​

•​Pixel Presentation (0008,9205) has a value of TRUE_COLOR​

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•​Presentation State Classification Component Sequence (0070,1801) has two items:​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​Presentation State Compositor Component Sequence (0070,1805) has one item:​

•​RGB Compositor component​

Figure XXX.6-3. Two Inputs to PCS-Values Output​

•​Three inputs to PCS-Values output:​

•​Pixel Presentation (0008,9205) has a value of TRUE_COLOR​

•​Presentation State Classification Component Sequence (0070,1801) has three items:​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​Presentation State Compositor Component Sequence (0070,1805) has two items:​

•​RGB Compositor component that combines the outputs of the first two classification components into one RGB​

•​RGBCompositorcomponentthatcombinestheoutputsofthepreviousRGBCompositorandthethirdclassificationcomponent​ into one RGB. This RGB Compositor internally sets the missing Alpha to (1 - Alpha-3) since there is no Alpha output from the​ previous RGB Compositor​

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Figure XXX.6-4. Three Inputs to PCS-Values Output​

•​TheVolumetricPresentationStateDisplayModuleprovidesfunctionalityequivalenttotheEnhancedBlendingandDisplayPipeline​ defined in Section C.7.6.23 “Enhanced Palette Color Lookup Table Module” in PS3.3:​

•​For P-Value output:​

•​Pixel Presentation (0008,9205) has a value of MONOCHROME​

•​Presentation LUT Shape (2050,0020) is present​

Figure XXX.6-5. VPS Display Pipeline Equivalent to the Enhanced Blending and Display Pipeline for​ P-Values​

•​For PCS-Value output:​

•​Pixel Presentation (0008,9205) has a value of TRUE_COLOR​

•​Presentation State Classification Component Sequence (0070,1801) has two items:​ •​One Input -> RGBA component (Component Type (0070,1802) = ONE_TO_RGBA)​ •​Two Input -> RGBA component (Component Type (0070,1802) = TWO_TO_RGBA)​ •​o Presentation State Compositing Component Sequence (0070,1805) has one item:​

•​RGB Compositor component​

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Scalar value

One Input

RGB-2 RBGA

Scalar value

Figure XXX.6-6. VPS Display Pipeline Equivalent to the Enhanced Blending and Display Pipeline for​ PCS-Values​

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YYY Preclinical Small Animal Imaging​

Acquisition Context (Informative)​

YYY.1 ​

This Annex describes the use of Preclinical Small Animal Imaging Acquisition Context.​

YYY.1.1 Example of housing and anesthesia for PET-CT​

This Section contains examples for use cases involving imaging of a single animal in a hybrid PET-CT system.​

The basic use case involves an animal, which:​

•​lives in an individually ventilated home cage with several other animals in the same cage​

•​is (briefly) transported (in its home cage) with its cage mates to the imaging facility, without heating, with an appropriate lid​

•​is removed from its home/transport cage for preparation for imaging, involving insertion of a tail vein cannula, performed on an​ electrically heated pad​

•​is induced by (a) placement in an induction chamber with more concentrated volatile anesthetic, or (b) intraperitoneal injection of​ Ketamine mixture​

•​isplacedinaPET-CTcompatibleimagingsled/carrier/chamberforimaging(ofoneanimalatatime),withanesthesiawithIsoflurane​ and Oxygen as the carrier gas, and heated with an electric pad regulated by feedback from a rectal probe​

•​is removed for recovery in a separate cage​

The content tree structure (when induction is by a volatile anesthetic) would resemble:​

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