# How to get the CT value (HU) of ROI; and area of ROI using markup closed curve? 

**URL:** <https://discourse.slicer.org/t/how-to-get-the-ct-value-hu-of-roi-and-area-of-roi-using-markup-closed-curve/32873>\
**Category:** Support\
**Tags:** segmentation, extensions-manager\
**Created:** [November 17, 2023, 11:55am UTC](https://discourse.slicer.org/t/how-to-get-the-ct-value-hu-of-roi-and-area-of-roi-using-markup-closed-curve/32873 "2023-11-17T11:55:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SUSZHF](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@SUSZHF](https://discourse.slicer.org/u/SUSZHF)\
**Post date:** [November 17, 2023, 11:55am UTC](https://discourse.slicer.org/t/how-to-get-the-ct-value-hu-of-roi-and-area-of-roi-using-markup-closed-curve/32873/1 "2023-11-17T11:55:02Z")

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How to get the CT value (unit:Hu) of ROI for muscle and vetebra using 3D Slicer? In addition, i don’t ensure whether the value of area of ROI is correct using the method “markup-closed curve-Quantification-segment statistics”, and if click “segment editor-add-paint–segment statistics”, there is no value about the cross-area, but only the volume. Hope getting your help for addressing my confusion, thanks ！