Image Pixel
(0028,0102)
High Bit
Keyword: HighBit
Most significant bit for pixel sample data. Shall be one less than Bits Stored.
Tag Attributes
- Tag ID
- (0028,0102)
- Compact
- 00280102
- Keyword
- HighBit
- VR
- US — Unsigned Short
- VM
- 1
- Retired
- No
Module(s)
Image Pixel Module
Engineering Notes
Identifies the most significant bit position within the allocated bits. Must equal Bits Stored − 1. Incorrect value causes systematically wrong pixel value display.
Troubleshooting
If High Bit ≠ Bits Stored − 1, immediately flag as encoding defect. This causes all pixel values to be bit-shifted, producing wrong Hounsfield units in CT.
Common Values
| Value | Meaning |
|---|---|
| 7 | For 8-bit stored |
| 11 | For 12-bit stored (CT standard) |
| 15 | For 16-bit stored |