DICOM PS3.3 2021c - Information Object Definitions

A.33 Softcopy Presentation State Information Object Definitions (Current)
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## A.33 Softcopy Presentation State Information Object Definitions

### A.33.1 Grayscale Softcopy Presentation State IOD

#### A.33.1.1 Grayscale Softcopy Presentation State IOD Description

The Grayscale Softcopy Presentation State Information Object Definition (IOD) specifies information that may be used to present (display) monochrome images that are referenced from within the IOD.

It includes capabilities for specifying:

1. the output grayscale space in P-Values

2. grayscale contrast transformations including modality and VOI LUT

3. mask subtraction for multi-frame images

4. selection of the area of the image to display and whether to rotate or flip it

5. image and display relative annotations, including graphics, text and overlays

### Note

1. This IOD does not support presentation control for a set of images for which the modality LUT varies on a frame-by-frame basis. Other Presentation State IODs (standard or private) may support such images.

2. This IOD may only be used to reference monochrome images, i.e. images with a Photometric Interpretation (0028,0004) of MONOCHROME1 or MONOCHROME2. See Section A.33.2 for the Color Softcopy Presentation State IOD, which allows for referencing color images, e.g. images with a Photometric Interpretation (0028,0004) of RGB.

#### A.33.1.2 Grayscale Softcopy Presentation State IOD Entity-Relationship Model

This IOD uses the E-R Model in Section A.1.2, with only the Presentation State IE below the Series IE.

#### A.33.1.3 Grayscale Softcopy Presentation State IOD Module Table

Table A.33.1-1 specifies the Modules of the Grayscale Softcopy Presentation State IOD.

Table A.33.1-1. Grayscale Softcopy Presentation State IOD Modules

IE | Module | Reference | Usage
--- | --- | --- | ---
Patient | Patient | C.7.1.1 | M
Clinical Trial Subject | C.7.1.3 | U
Study | General Study | C.7.2.1 | M
Patient Study | C.7.2.2 | U
Clinical Trial Study | C.7.2.3 | U
Series | General Series | C.7.3.1 | M
Clinical Trial Series | C.7.3.2 | U
Presentation Series | C.11.9 | M
Equipment | General Equipment | C.7.5.1 | M
Presentation State | Presentation State Identification | C.11.10 | M
Presentation State Relationship | C.11.11 | M
Presentation State Shutter | C.11.12 | M
Presentation State Mask | C.11.13 | M
Mask | C.7.6.10 | C - Required if the referenced image(s) are multi-frame and are to be subtracted
Display Shutter | C.7.6.11 | C - Required if a Display Shutter is to be applied to referenced image(s) and the Bitmap Display Shutter Module is not present
Bitmap Display Shutter | C.7.6.15 | C - Required if a Display Shutter is to be applied to referenced image(s) and the Display Shutter Module is not present
Overlay Plane | C.9.2 | C - Required if Overlay is to be applied to referenced image(s) or the Bitmap Display Shutter Module is present.
Overlay Activation | C.11.7 | C - Required if referenced image contains overlay data that is to be displayed or Presentation State Instance contains Overlay data other than Bitmap Shutter
Displayed Area | C.10.4 | M
Graphic Annotation | C.10.5 | C - Required if Graphic Annotations are to be applied to referenced image(s)
Spatial Transformation | C.10.6 | C - Required if rotation or flipping are to be applied to referenced image(s)
Graphic Layer | C.10.7 | C - Required if Graphic Annotations or Overlays or Curves are to be applied to referenced image(s)
Graphic Group | C.10.11 | U
Modality LUT | C.11.1 | C - Required if a Modality LUT is to be applied to referenced image(s)
Softcopy VOI LUT | C.11.8 | C - Required if a VOI LUT is to be applied to referenced image(s)
Softcopy Presentation LUT | C.11.6 | M
SOP Common | C.12.1 | M

In the Grayscale Softcopy Presentation State IOD, the Presentation Series Module specializes some Attributes of the General Series Module, the Presentation State Mask Module specializes some Attributes of the Mask Module, and the Presentation State Shutter Module specializes some Attributes of the Bitmap Display Shutter Module and Display Shutter Module.

### Note

1. Subtraction between different images is not supported.

2. The Mask Module condition implies that it need not be supported by an SCP that supports presentation states only for single-frame image storage SOP Classes, or Instances of multi-frame image Storage SOP Classes that contain only one frame.

3. The Display Shutter may be used to darken image areas that surround important information and exclude extraneous bright areas that increase glare and ambient lighting impairing image interpretation. For example, unexposed areas in a CR image might be obscured using the Display Shutter, rather than permanently replacing image pixels in those areas.

4. This IOD does not support the storage of a multi-frame overlay in the IOD itself, but does support selective activation of multi-frame overlays within the referenced images via the Overlay Activation Module.

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DICOM PS3.3 2021c - Information Object Definitions