DICOM PS3.4 2017a - Service Class Specifications

FF Volumetric Presentation State Storage SOP Classes (Normative)
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# FF Volumetric Presentation State Storage SOP Classes (Normative)

## FF.1 Overview

### FF.1.1 Scope

The Volumetric Presentation State Storage SOP Classes extend the functionality of the Storage Service class (defined in Annex B) to add the ability to convey an intended Volumetric Presentation State or record an existing Volumetric Presentation State. The SOP Classes specify the information and behavior that may be used to present (display) images that are referenced from within the SOP Classes.

They include capabilities for specifying:

- spatial registration on the input datasets

- cropping of the volume datasets by a bounding box, oblique planes and segmentation objects

- the generation geometry of volumetric views

- scalar to P-Value or RGB Value conversions

- compositing of multiple renderings

- clinical description of the specified view

- volume and display relative annotations, including graphics, text and overlays

- membership to a collection of related Volumetric Presentation States intended to be processed or displayed together

- the position within a set of related Volumetric Presentation States

- animation of the view

- reference to an image depicting the view described by the Presentation State

Each Volumetric Presentation State corresponds to a single view (equivalent to an Image Box in a Hanging Protocol or Structured Display). If multiple Volumetric Presentation States are intended to be displayed together (e.g., a set of orthogonal MPR views) these Presentation States can be grouped by assigning them to a Display Collection. However, any detailed information about how a set of views should be presented can only be described by a Structured Display instance or a Hanging Protocol.

The Planar MPR Volumetric Presentation State refers to the multi-planar geometry and grayscale or color image transformations that are to be applied in an explicitly defined manner to convert the stored image pixel data values in a Composite Image Instance to presentation values (P-Values) or Profile Connection Space values (PCS-Values) when an image is displayed on a softcopy device.

The P-Values are in a device independent perceptually linear space that is formally defined in PS3.14 Grayscale Standard Display Function. The PCS-Values are in a device independent space that is formally defined in the ICC Profiles as CIEXYZ or CIELab values.

How an SCP of these SOP Classes chooses between multiple Presentation State instances that may apply to an image is beyond the scope of this standard.

A claim of conformance as an SCP of the SOP Class implies that the SCP shall make the Presentation State available to the user of the device, and if selected by the user, shall apply all the transformations stored in the state in the manner in which they are defined in the standard.

How an SCP of these SOP Classes chooses to display multiple states that are part of a Display Collection is beyond the scope of this standard.

### Note

For example, if a user selects a state that is part of a four state Spatial Collection, an SCP may choose to display all four together, to display the single state selected by the user or to display two of the four states deemed appropriate by the SCP.

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DICOM PS3.4 2017a - Service Class Specifications