Temporal Position Index Attribute
| Tag | (0020,9128) |
|---|---|
| Type | Conditionally Required (1C) |
| Keyword | TemporalPositionIndex |
| Value Multiplicity | 1 |
| Value Representation | Unsigned Long (UL) |
Ordinal number (starting from 1) of the frame in the set of frames with different temporal positions.
Required if the value of SOP Class UID (0008,0016) equals "1.2.840.10008.5.1.4.1.1.130" or Functional MR Sequence (0018,9621) is present. May be present otherwise. See Section C.7.6.16.2.2.6 and Section C.7.6.16.2.2.8.
Note
Part of the Frame Content Functional Group Macro with usage: M
Section C.7.6.16.2.2.6
C.7.6.16.2.2.6 Temporal Position Index and Stack ID in PET images
For PET Dynamic images, i.e., images in which Image Type (0008,0008) Value 3 is DYNAMIC, Temporal Position Index is used to distinguish between the multiple acquisitions of the same anatomical area. Similarly, the frames that result from one acquisition over the anatomic area shall be contained in one stack. Thus, for Dynamic images, Temporal Position Index (0020,9128), Stack ID (0020,9056), and In-Stack Position Number (0020,9057) shall be used as three of the dimensions of the image, in that order.
Figure C.7.6.16-4b describes the usage for a PET dynamic image.
Figure C.7.6.16-4b. PET dynamic frame organization
Section C.7.6.16.2.2.8
C.7.6.16.2.2.8 Usage of Temporal Position Index, Stack ID and In-Stack Position Number in fMRI Volumes
For fMRI volumes the Temporal Position Index is used to distinguish between the multiple volumes acquired in time (phases of a volume) for the same Stack ID. Each frame in the volume has an In-Stack Position Number that is the ordinal number in space of each volume. See Figure C.7.6.16-4c for an example.
Figure C.7.6.16-4c. Example of Functional MRI volumes