# How do I erase colic air automatically segmented by Lung CT Analyzer?

**URL:** <https://discourse.slicer.org/t/how-do-i-erase-colic-air-automatically-segmented-by-lung-ct-analyzer/16511>\
**Category:** Support\
**Tags:** lungctanalyzer\
**Created:** [March 12, 2021, 10:15pm UTC](https://discourse.slicer.org/t/how-do-i-erase-colic-air-automatically-segmented-by-lung-ct-analyzer/16511 "2021-03-12T22:15:20Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![GammaMi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gammami/32/10278_2.png) [@GammaMi](https://discourse.slicer.org/u/GammaMi)\
**Post date:** [March 12, 2021, 10:15pm UTC](https://discourse.slicer.org/t/how-do-i-erase-colic-air-automatically-segmented-by-lung-ct-analyzer/16511/1 "2021-03-12T22:15:20Z")

</div>

Operating system: Windows 10  
Slicer version: 4.11.20210226 r29738 / 7a593c8

Expected behavior:  
Actual behavior: sometimes the Lung CT analyzer extension automatically selects colic gas when segmenting lungs. How do I remove it?

@rbumm

---

<div class="post-metadata">

**Author:** ![rbumm](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rbumm/32/9404_2.png) [@rbumm](https://discourse.slicer.org/u/rbumm)\
**Post date:** [March 13, 2021, 9:42am UTC](https://discourse.slicer.org/t/how-do-i-erase-colic-air-automatically-segmented-by-lung-ct-analyzer/16511/2 "2021-03-13T09:42:55Z")

</div>

There are actually two ways to do this:

Before pressing “Apply” , you could select “Other” markers and place a few of them into the area of colic gas.

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/a/fa7627beba8cb49b9ebd09ce69f12e888212ea5c.png)

With each placement, the preview will update itself and show you a new model. “Other” can be used to mark anything that is not right or left lung.

Secondly (if the misinterpreted area is very big or lung leaking even to the outside of the skin), you could play with the intensity range slider (slide the right one a bit to the middle and press “Update”. Then “Apply”.

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/1/715e4248f5759ffb6e731471c86ff904f1c656aa.png)

---

<div class="post-metadata">

**Author:** ![GammaMi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gammami/32/10278_2.png) [@GammaMi](https://discourse.slicer.org/u/GammaMi)\
**Post date:** [March 13, 2021, 10:59am UTC](https://discourse.slicer.org/t/how-do-i-erase-colic-air-automatically-segmented-by-lung-ct-analyzer/16511/3 "2021-03-13T10:59:57Z")

</div>

Thank you very much indeed for your fast and precise response.  
I’ll try as soon as possible.

Have a nice day,  
Guido.