Image Pixel
(0028,0030)
Pixel Spacing
Keyword: PixelSpacing
Physical distance in mm between centres of adjacent pixels. Two values: row spacing (distance between rows) and column spacing (distance between columns).
Tag Attributes
- Tag ID
- (0028,0030)
- Compact
- 00280030
- Keyword
- PixelSpacing
- VR
- DS — Decimal String
- VM
- 2
- Retired
- No
Module(s)
Image Plane Module
Engineering Notes
Determines the physical scale of the image for measurement tools. Incorrect Pixel Spacing causes wrong ruler measurements in PACS and calibration errors in radiography.
Troubleshooting
PACS ruler giving wrong measurements? The #1 cause is incorrect Pixel Spacing. Verify against the modality's calibration certificate. DR systems are particularly susceptible when detector panels are swapped.