# Can 3D slicer reach transparency in volume rendering like syngo do?

**URL:** <https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329>\
**Category:** Support\
**Tags:** dicom, volume-rendering\
**Created:** [April 26, 2021, 11:04am UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329 "2021-04-26T11:04:35Z")\
**Posts on this page:** 6\
**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:** [April 26, 2021, 11:04am UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/1 "2021-04-26T11:04:35Z")

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it is crucial for vascular surgeon to confirm the position of intimal tear in aortic dissection even in low quality CTA

 ![捕获](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/4/e40e8e9247ea399e44bdbd0be788ec7ff08c437e.png)

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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:** [April 26, 2021, 11:07am UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/2 "2021-04-26T11:07:02Z")

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3D reconstruction from segmentation in this case sure can not provide a clear view of intimal tear

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [April 26, 2021, 2:21pm UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/3 "2021-04-26T14:21:58Z")

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It’s probably possible to get similar volume rendering from Slicer with some work. But I would say that is a pretty high quality CTA and I would not expect you could get a rendering like that from a low quality CTA.

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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:** [April 26, 2021, 10:01pm UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/4 "2021-04-26T22:01:08Z")

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It looks like a basic volume raycasting with gradient opacity mapping enabled and surrounding stuctures cropped or masked.

Go to volume rendering and set gradient opacity mapping function value to 0 for low values. Also define a cropping region to get rid of surrounding structures. If you need tighter (non-rectangular) cropping then you can use Segment Editor and volume masking.

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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:** [April 26, 2021, 10:59pm UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/5 "2021-04-26T22:59:37Z")

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actually in a better quality CTA，intimal tear can be clearly seen through segmentation and adjust of transparency in 3D view，while in this case, 3D view from segmentation is a mess.

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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:** [April 26, 2021, 11:00pm UTC](https://discourse.slicer.org/t/can-3d-slicer-reach-transparency-in-volume-rendering-like-syngo-do/17329/6 "2021-04-26T23:00:09Z")

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thanks,I will have a try