Positioner Secondary Angle Increment Attribute
| Tag | (0018,1521) |
|---|---|
| Type | Conditionally Required, Empty if Unknown (2C) |
| Keyword | PositionerSecondaryAngleIncrement |
| Value Multiplicity | 1-n |
| Value Representation | Decimal String (DS) |
Incremental change in secondary positioner angle for each frame.
See Section C.8.7.5.1.3.
Required if Positioner Motion (0018,1500) equals DYNAMIC.
Section C.8.7.5.1.3
C.8.7.5.1.3 Positioner Angle Increments
If the positioner angles change during acquisition of a multi-frame image, the Positioner Angle Increment Attributes describe the angular change per frame.
If the change in positioner angle is nominally constant for each frame, these fields may contain a single value of the average angular change per frame. Alternatively, the fields may contain a vector of offsets from the (initial) Positioner Angle Attributes, with one value for each frame in the multi-frame image. The number of values in the Positioner Angle Increment Attributes must be one, or must be equal to Number of Frames (0028,0008) in the Multi-frame Module (see Section C.7.6.6).
Note
It is permissible to generate a vector of the absolute positioner angles in the Positioner Angle Increment Attributes, and set the Positioner Primary and Secondary Angle Attributes to value 0.