# How to measure distance along the surface of segmented or volume rendering aorta?

**URL:** <https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135>\
**Category:** Support\
**Tags:** segmentation, volume-rendering\
**Created:** [August 10, 2021, 8:41am UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135 "2021-08-10T08:41:01Z")\
**Posts on this page:** 5\
**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:** [August 10, 2021, 8:41am UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135/1 "2021-08-10T08:41:01Z")

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i want to measure distance between 2 points along the surface of aorta, how can i achieve it? thanks!

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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:** [August 10, 2021, 4:49pm UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135/2 "2021-08-10T16:49:13Z")

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You can create a markups curve with two endpoints and choose “Shortest distance on surface” curve type:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/6/36fb20700c334c2121b00c7c2df8a61547f8ec49.png)

The curve will go through the mesh points, so if the mesh resolution is low then the curve may not be smooth/straight. If you find that the curve is not good enough quality then you can subdivide the mesh to have more candidate points for the curve to go through.

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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:** [August 11, 2021, 7:27am UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135/3 "2021-08-11T07:27:10Z")

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Dear Lassoan, in my vision (4.13.0), there is no vessel in Model Node, should i download some module?

 ![捕获](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/3/23c7f8a955d9d777f4a676bd0b7e33881b23f30f.png)

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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:** [August 12, 2021, 3:49am UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135/4 "2021-08-12T03:49:38Z")

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You can choose any model node. If you have the aorta as a segmentation node then you can export it to a model node by right-clicking on it in Data module.

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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:** [August 13, 2021, 6:02am UTC](https://discourse.slicer.org/t/how-to-measure-distance-along-the-surface-of-segmented-or-volume-rendering-aorta/19135/5 "2021-08-13T06:02:20Z")

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> [@lassoan](#):
>
> orta as a segmentation node then you can export it to a model node by right-clicking on it in Data module.

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