# CBCT too slow to segment

**URL:** <https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [February 26, 2021, 3:38pm UTC](https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243 "2021-02-26T15:38:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mohammed\_alshakhas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mohammed_alshakhas/32/10025_2.png) [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\
**Post date:** [February 26, 2021, 3:38pm UTC](https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243/1 "2021-02-26T15:38:35Z")

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i noticed that segmenting CBCT is way slower than Medical CT although the latter being way smaller in size .

any suggestion to make segmenting CBCT faster ?

thanks

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/83011_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [February 26, 2021, 4:21pm UTC](https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243/2 "2021-02-26T16:21:41Z")

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> [@mohammed\_alshakhas](#):
>
> segmenting CBCT is way slower than Medical CT although the latter being way smaller

If what you wrote is correct, i.e., CBCT is larger than the medical ct in size, yes, that’s expected. As the size of the volume increases more computation (and memory) is necessary to do the segmentations.

How big is your CBCT (image dimensions and data type)?

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**Author:** ![mohammed\_alshakhas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mohammed_alshakhas/32/10025_2.png) [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\
**Post date:** [February 26, 2021, 4:23pm UTC](https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243/3 "2021-02-26T16:23:08Z")

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im sorry i meant medical CT is bigger

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**Author:** ![mohammed\_alshakhas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mohammed_alshakhas/32/10025_2.png) [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\
**Post date:** [February 26, 2021, 4:30pm UTC](https://discourse.slicer.org/t/cbct-too-slow-to-segment/16243/4 "2021-02-26T16:30:24Z")

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its 507 by 507 , that what is mentioned in size column