# Seek the source technique for CT and Ultrasound based Mitral Valve/ Annulus

**URL:** <https://discourse.slicer.org/t/seek-the-source-technique-for-ct-and-ultrasound-based-mitral-valve-annulus/24007>\
**Category:** Support\
**Tags:** slicerheart\
**Created:** [June 23, 2022, 8:27am UTC](https://discourse.slicer.org/t/seek-the-source-technique-for-ct-and-ultrasound-based-mitral-valve-annulus/24007 "2022-06-23T08:27:31Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![whu](https://avatars.discourse-cdn.com/v4/letter/w/7ab992/32.png) [@whu](https://discourse.slicer.org/u/whu)\
**Post date:** [June 23, 2022, 8:27am UTC](https://discourse.slicer.org/t/seek-the-source-technique-for-ct-and-ultrasound-based-mitral-valve-annulus/24007/1 "2022-06-23T08:27:31Z")

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Dear All,

Since 3d slicer support CT and Ultrasound based Mitral Valve/ Annulus segmentation.

Where can I found the source technique papers?

Maybe that is the way open-source benifits for researchers.

Thanks for suggestion.

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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:** [June 24, 2022, 5:15am UTC](https://discourse.slicer.org/t/seek-the-source-technique-for-ct-and-ultrasound-based-mitral-valve-annulus/24007/2 "2022-06-24T05:15:09Z")

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You can use `Valve Annulus Analysis` module in `SlicerHeart` extension to specify the annulus curve.

If you want to segment the leaflets then I would recommend to use `Crop volume` module to crop the image to the valve and resample it to 0.3mm isotropic resolution as a very first step. Then, segment this image using `Paint` tool in `Segment Editor` module. You can set `Editable intensity range` to a range that only paints in bright regions, because then you can use a large sphere brush to get an approximate segmentation very quickly. You then need to disable `Editable intensity range` and fix the segmentation (for example fill the discontinuities in the leaflets that are due to just signal dropout). Once you have good-quality segmentation, you can use `Scissors` effect to split the leaflet into two separate segments.

We’ll release a module soon that automates some of these steps (cropping, resampling, etc.) saving a little time. We have been also working on fully automatic deep-learning based leaflet segmentation tools (e.g., [tricuspid valves with HLHS](https://www.researchgate.net/publication/356912840_Segmentation_of_Tricuspid_Valve_Leaflets_From_Transthoracic_3D_Echocardiograms_of_Children_With_Hypoplastic_Left_Heart_Syndrome_Using_Deep_Learning)) that we’ll soon release publicly. There have been many other groups developing similar tools for mitral valves.

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<div class="post-metadata">

**Author:** ![whu](https://avatars.discourse-cdn.com/v4/letter/w/7ab992/32.png) [@whu](https://discourse.slicer.org/u/whu)\
**Post date:** [June 27, 2022, 1:52am UTC](https://discourse.slicer.org/t/seek-the-source-technique-for-ct-and-ultrasound-based-mitral-valve-annulus/24007/3 "2022-06-27T01:52:00Z")

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> [@lassoan](#):
>
> You can use `Valve Annulus Analysis` module in `SlicerHeart` extension to specify the annulus curve.

This step, we need to segment the annulus firstly, right ?

Here I got a CTA DICOM data, I try to segment the annulus.

Thanks.