# Threshold in the segment editor

**URL:** <https://discourse.slicer.org/t/threshold-in-the-segment-editor/29316>\
**Category:** Support\
**Tags:** threshold\
**Created:** [May 6, 2023, 2:23pm UTC](https://discourse.slicer.org/t/threshold-in-the-segment-editor/29316 "2023-05-06T14:23:28Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [May 6, 2023, 2:40pm UTC](https://discourse.slicer.org/t/threshold-in-the-segment-editor/29316/2 "2023-05-06T14:40:14Z")

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The threshold is in terms of the data values in your images. If the data is a clinical CT, then it would be [HU](https://radiopaedia.org/articles/hounsfield-unit). But your data appears to be a scan of a printed film, so the units are probably not calibrated.

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