# Segmentation using curves

**URL:** <https://discourse.slicer.org/t/segmentation-using-curves/46511>\
**Category:** Support\
**Created:** [March 20, 2026, 1:38pm UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511 "2026-03-20T13:38:09Z")\
**Posts on this page:** 4\
**Page:** 2

<div class="post-metadata">

**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:** [March 26, 2026, 8:20pm UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511/21 "2026-03-26T20:20:27Z")

</div>

The result below is obtained by this method:

- segment the femur
- convert the segment to a model
- outline the cartilage with a closed curve
- use Curve cut in the Dynamic modeler module

This has been done at the segmented bone’s surface. May be you could grow the segment by 1 mm at least, apply Joint smoothing before converting to a model. This would account for the thickness of the cartilage, which is itself an invisible structure on a CT scan.

![Cartilage](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/3/c3293e1c8ec7069069cfb0849bba8cc8d96bc91d.gif)

---

<div class="post-metadata">

**Author:** ![mrrezaie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mrrezaie/32/17032_2.png) [@mrrezaie](https://discourse.slicer.org/u/mrrezaie)\
**Post date:** [March 27, 2026, 8:33am UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511/22 "2026-03-27T08:33:09Z")

</div>

This is an interesting approach; thanks for introducing the Dynamic Modeler module.

By any chance, is there any option to interpolate the segmentation? At the moment, I have 31 slices and interpolating the image doesn’t fix these steps, I have to do segmentation in all interpolated images.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/8/78fb0081197a2eb1f863a81416e30e86028556af.png)

---

<div class="post-metadata">

**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:** [March 27, 2026, 11:35am UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511/23 "2026-03-27T11:35:25Z")

</div>

Your best bet to segment the bone in this context is the [Grow from seeds](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#grow-from-seeds) effect of the `Segment editor.`

It’s not a one-click process. You’ll have to combine with many other effects.

---

<div class="post-metadata">

**Author:** ![mrrezaie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mrrezaie/32/17032_2.png) [@mrrezaie](https://discourse.slicer.org/u/mrrezaie)\
**Post date:** [March 29, 2026, 2:29pm UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511/24 "2026-03-29T14:29:42Z")

</div>

Thanks for the suggestion; I’m now trying the alternative approach in more details. Since this is a different topic, I created a new post for that: [Keep the hand-drawn segmentation after interpolation](https://discourse.slicer.org/t/keep-the-hand-drawn-segmentation-after-interpolation/46605)

[Previous page](https://discourse.slicer.org/t/segmentation-using-curves/46511.md?page=1)