# How to include the aortic wall when i do auto segmentation using local threshold?

**URL:** <https://discourse.slicer.org/t/how-to-include-the-aortic-wall-when-i-do-auto-segmentation-using-local-threshold/14890>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [December 5, 2020, 5:43am UTC](https://discourse.slicer.org/t/how-to-include-the-aortic-wall-when-i-do-auto-segmentation-using-local-threshold/14890 "2020-12-05T05:43:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![chendong9416](https://avatars.discourse-cdn.com/v4/letter/c/c2a13f/32.png) [@chendong9416](https://discourse.slicer.org/u/chendong9416)\
**Post date:** [December 5, 2020, 5:43am UTC](https://discourse.slicer.org/t/how-to-include-the-aortic-wall-when-i-do-auto-segmentation-using-local-threshold/14890/1 "2020-12-05T05:43:09Z")

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![Screenshot](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/c/4cfbdbf71694438bfee196ebfcff005e6e152f27.jpeg)

this is a really importment step for centerline extration of aortic intramural hematoma!

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [December 5, 2020, 5:50am UTC](https://discourse.slicer.org/t/how-to-include-the-aortic-wall-when-i-do-auto-segmentation-using-local-threshold/14890/2 "2020-12-05T05:50:17Z")

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Since it seems that there are large sections where the aortic wall is not distinguishable from surrounding tissues(they have the same gray value), expert knowledge (manual segmentation) is needed to draw the contour where it is actually not visible.

To reduce manual segmentation time by a factor of 5-10x, you can use segment one out of every 5-10 slices and interpolate between them using “Fill between slices” effect.

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**Author:** ![chendong9416](https://avatars.discourse-cdn.com/v4/letter/c/c2a13f/32.png) [@chendong9416](https://discourse.slicer.org/u/chendong9416)\
**Post date:** [December 5, 2020, 5:53am UTC](https://discourse.slicer.org/t/how-to-include-the-aortic-wall-when-i-do-auto-segmentation-using-local-threshold/14890/3 "2020-12-05T05:53:54Z")

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thanks, this hopes a lot.