DICOM PS3.3 2016c - Information Object Definitions

C.11.23.3 Volumetric Presentation State Reference Coordinate System
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#### C.11.23.3 Volumetric Presentation State Reference Coordinate System

The Volumetric Presentation State Reference Coordinate System (VPS-RCS) is identified by the Section C.7.4.1 “Frame of Reference Module”.

All SOP Instances specified in the Volumetric Presentation State Relationship Module shall be implicitly or explicitly registered to the Volumetric Presentation State Reference Coordinate System. Registration is implicit if the Frame of Reference of a particular input SOP Instance is chosen as the VPS-RCS. Explicit registration is required if the Frame of Reference UID value of one or more input SOP Instances are different from the Frame of Reference UID value of the Presentation State.

### Note

1. If the Presentation State has a single source object, it is recommended that the Presentation State use the same Frame of Reference UID as the source object and not require explicit Spatial Registration.

2. It should be recognized that not all objects with the same Frame of Reference UID values are precisely registered to the frame of reference implied by that UID (for example, successive scans of a patient by a CT/PET scanner where the patient may have moved somewhat between scans). In such a case, explicit registration may be necessary to achieve the precision of registration required by the clinical application.

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DICOM PS3.3 2016c - Information Object Definitions