Instance
(0020,0013)
Instance Number
Keyword: InstanceNumber
A number that identifies this instance. Used to order images within a series.
Tag Attributes
- Tag ID
- (0020,0013)
- Compact
- 00200013
- Keyword
- InstanceNumber
- VR
- IS — Integer String
- VM
- 1
- Retired
- No
Module(s)
General Image Module
Engineering Notes
The per-image sequence number within a series. Used for slice ordering in MPR, cine display, and stacking. Gaps or duplicates cause misordered series in PACS viewers.
Troubleshooting
Garbled or random slice ordering in PACS viewer usually means incorrect Instance Numbers or reliance on Instance Number when Image Position (Patient) should be used.