# How does the aortic diameter in cross-section analysis calculated?

**URL:** <https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653>\
**Category:** Support\
**Tags:** vessels\
**Created:** [November 17, 2020, 2:48am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653 "2020-11-17T02:48:33Z")\
**Posts on this page:** 10\
**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:** [November 17, 2020, 2:48am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/1 "2020-11-17T02:48:34Z")

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Hi, i just want to know how the aortic diameter shown in cross-section analysis (after extract centerline) is calculated, thanks.

 ![捕获1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/7/874dc178f6f42f13f66bb36eaf37559bb9629d46.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:** [November 17, 2020, 5:28am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/2 "2020-11-17T05:28:03Z")

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Cross-section is computed by extract centerline module, using [VMTK](http://www.vmtk.org/).

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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:** [November 17, 2020, 5:38am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/3 "2020-11-17T05:38:40Z")

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sorry, i mean does the aortic diameter shown in the cross-section analysis refer to (1) from anterior to posterior wall (APD), (2) from right to left lateral wall (transD), (3) maximal diameter in any direction (axialDmax) or (4) perpendicular to axialDmax (shortaxisD)?

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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:** [November 17, 2020, 5:41am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/4 "2020-11-17T05:41:10Z")

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Vessel diameter is computed as diameter of maximal inscribed sphere. See VMTK documentation for details.

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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:** [November 17, 2020, 6:02am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/5 "2020-11-17T06:02:28Z")

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how can i get the VMTK documentation?

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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:** [November 17, 2020, 6:03am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/6 "2020-11-17T06:03:09Z")

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> **[Learn vmtk | vmtk - the Vascular Modelling Toolkit](http://www.vmtk.org/documentation/)**

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<div class="post-metadata">

**Author:** ![chendong9416](https://avatars.discourse-cdn.com/v4/letter/c/c2a13f/32.png) [@chendong9416](https://discourse.slicer.org/u/chendong9416)\
**Post date:** [November 17, 2020, 6:26am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/7 "2020-11-17T06:26:02Z")

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sorry to say that i didn’t find any information about “diameter” in VMTK documentation, another questioin is how can i show the line measuring the diameter in the image of cross-section analysis?

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**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [November 17, 2020, 8:24am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/8 "2020-11-17T08:24:47Z")

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It’s an average diameter. The question of a static line does not convey much relevance, and is not involved by VMTK computation. Around the centerline at any point, you can draw as many lines as you want, each with a different diameter. The average diameter has sufficient clinical meaning. Think of it as : “at this point, the lumen is a circle with such diameter”.

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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:** [November 17, 2020, 8:39am UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/9 "2020-11-17T08:39:35Z")

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1. I think it’s worthy to find out, cause we may need to define it in furture papper
2. I would like to accept the average diameter explanation, but how does it calculated?it is an average diameter from what?

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**Author:** ![JohnMiles](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/johnmiles/32/8871_2.png) [@JohnMiles](https://discourse.slicer.org/u/JohnMiles)\
**Post date:** [November 18, 2020, 12:05pm UTC](https://discourse.slicer.org/t/how-does-the-aortic-diameter-in-cross-section-analysis-calculated/14653/10 "2020-11-18T12:05:13Z")

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Great topic, useful and explicit, thanks! 👍