C.11.23.2 Input Sequence Position Index

C.11.23.2 Input Sequence Position Index
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A sequence of inputs may be used in an animation. In this form of animation, the Presentation State is applied to each input in a sequence of inputs to produce a moving view. The inputs belonging to the input sequence are identified by the inclusion of an Input Sequence Position Index (0070,1203) value for each included input. See the INPUT_SEQ animation style in Section C.11.29.

Note

Examples include:

a sequence of cardiac volume acquisitions acquired through a heart cycle
a sequence of volume acquisitions during multiple phases of passage of a contrast agent

There is another animation method "Presentation Sequence Animation" that may be used. See Section C.11.22.2 “Presentation Sequence Collection UID”.

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

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.
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.