# Separate vessels from bones

**URL:** <https://discourse.slicer.org/t/separate-vessels-from-bones/15703>\
**Category:** Support\
**Tags:** segmentation, volume-rendering\
**Created:** [January 27, 2021, 9:11pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703 "2021-01-27T21:11:20Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Sevilay\_Karasu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sevilay_karasu/32/9678_2.png) [@Sevilay\_Karasu](https://discourse.slicer.org/u/Sevilay_Karasu)\
**Post date:** [January 27, 2021, 9:11pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703/1 "2021-01-27T21:11:20Z")

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Dear sir,  
when volume rendering is performed on the ct angiography data, arteries is obtained with bone. ı want to see just arteries from ct angiography data, without bone.but ı want to make a transparency on the bone. is it possible? how to make transparency on bone  
thanks in advance.

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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:** [January 27, 2021, 9:15pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703/2 "2021-01-27T21:15:34Z")

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This is a commonly needed task and you should be easily solve this (for reasonably good quality images) by segmenting the vessels as described in [this recipe](https://lassoan.github.io/SlicerSegmentationRecipes/AortaMaskedGrowFromSeeds/).

You can then for example show the vasculature as segmentation (as solid structure) and show surrounding anatomy using volume rendering.

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**Author:** ![Sevilay\_Karasu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sevilay_karasu/32/9678_2.png) [@Sevilay\_Karasu](https://discourse.slicer.org/u/Sevilay_Karasu)\
**Post date:** [January 27, 2021, 9:26pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703/3 "2021-01-27T21:26:38Z")

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thanks a million. ı want to ask one more thing. ı loaded a picture from an article -[Anatomical relationship between cranial surface landmarks and venous sinus in posterior cranial fossa using CT angiography - PubMed](https://pubmed.ncbi.nlm.nih.gov/22160178/). I wonder that is it possible to make the same thing for arteries.

 ![Ekran Resmi 2021-01-28 00.19.36](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/f/ff28ea9de188308f97c9b76b831b488410c50229.jpeg)

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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:** [January 27, 2021, 10:31pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703/4 "2021-01-27T22:31:33Z")

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The left image is created by segmenting the vessels and then using that to mask the volume (in Slicer: Mask volume effect in Segment Editor; provided by SegmentEditorExtraEffects extension).

The right image seems to be the same as the left, with the cranium overlaid. This can be achieved by:

1. segment the cranium and then use that to mask the volume and render it along the vessel volume using multi-volume rendering

Example with aorta and bones:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/b/bb96097803a10bea5c5463561fdea2e518bac4bb.jpeg)

1. render the cranium as segmentation, setting its 3D opacity to \<1

Example with aorta and soft tissues surface:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/c/1cfabda1bfc943c1f4b1ce5af3b85c9e862e8084.jpeg)

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<div class="post-metadata">

**Author:** ![Sevilay\_Karasu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sevilay_karasu/32/9678_2.png) [@Sevilay\_Karasu](https://discourse.slicer.org/u/Sevilay_Karasu)\
**Post date:** [February 3, 2021, 6:09pm UTC](https://discourse.slicer.org/t/separate-vessels-from-bones/15703/5 "2021-02-03T18:09:59Z")

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Thanks for your interest