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DICOM PS3.3 2020a - Information Object Definitions |
C.11.6.1.2 Presentation LUT Shape
A value of INVERSE shall mean the same as a value of IDENTITY, except that the minimum output value shall convey the meaning of the maximum available luminance, and the maximum value shall convey the minimum available luminance. In other words:
•P-Value = maximum value - output value
C.11.7 Overlay Activation Module
This Module defines a manner of controlling whether or not bit-mapped overlay and curve information are displayed.
If the corresponding Overlay Group activated is present within the Presentation State, then that Overlay shall be activated and any corresponding Overlay in the referenced image(s) ignored, otherwise the Overlay within the referenced image(s) shall be activated.
An Overlay Group referenced in the Bitmap Display Shutter Module described in Section C.7.6.15 shall not be activated using the Overlay Activation Module.
Table C.11.7-1 specifies the Attributes that describe the Overlay Activation Module.
Table C.11.7-1. Overlay Activation Module Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
Overlay Activation Layer |
(60xx,1001) |
2C |
Thelayer(definedinGraphicLayer(0070,0002)oftheGraphicLayerModule |
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in which the Overlay described in group 60xx shall be displayed. If no layer |
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is specified (zero length) then the overlay shall not be displayed. |
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Required if Group 60xx is present in the referenced image(s) or the |
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Presentation State instance containing this Module. |
Note |
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1.Previously, those bits that are stored in Pixel Data (7FE0,0010) above High Bit (0028,0102) could be used as overlay bitplanesiftheywerereferencedbyanOverlayBitPosition(60xx,0102).Thisusagehasbeenretired.SeePS3.3-2004. Their contents are unspecified in DICOM and should not be displayed. Usually they will be zero, though if the pixel data is signed, i.e., Pixel Representation (0028,0103) is0001H, then it is possible that the sign bit maybe "extended" through these values. Alternatively, they may have been "masked off" even if the value is signed and negative.
2.Previously,CurveActivationLayer(50xx,1001)wasdefinedinthisModule.Itsusagehasbeenretired.SeePS3.3-2004.
C.11.8 Softcopy VOI LUT Module
Table C.11.8-1 specifies the Attributes that describe the Softcopy VOI LUT. These Attributes have the same meaning and behavior as defined in the Section C.11.2 VOI LUT Module.
Table C.11.8-1. Softcopy VOI LUT Module Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
Softcopy VOI LUT |
(0028,3110) |
1 |
DefinesaSequenceofVOILUTsorWindowCentersandWidths |
Sequence |
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and to which images and frames they apply. |
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No more than one VOI LUT Sequence containing a single Item |
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or one pair of Window Center/Width values shall be specified for |
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each image or frame. |
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One or more Items shall be included in this Sequence. |