# How to measure the CT number (HU) from all image series?

**URL:** <https://discourse.slicer.org/t/how-to-measure-the-ct-number-hu-from-all-image-series/34722>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [March 5, 2024, 8:24pm UTC](https://discourse.slicer.org/t/how-to-measure-the-ct-number-hu-from-all-image-series/34722 "2024-03-05T20:24:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![siksincs](https://avatars.discourse-cdn.com/v4/letter/s/ba8739/32.png) [@siksincs](https://discourse.slicer.org/u/siksincs)\
**Post date:** [March 5, 2024, 8:24pm UTC](https://discourse.slicer.org/t/how-to-measure-the-ct-number-hu-from-all-image-series/34722/1 "2024-03-05T20:24:42Z")

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After I used ‘segment cross-section area’ to measure the area (mm^2) from each slice, how can I measure the CT number from each slice?