# The least voxels that ROI should contains

**URL:** <https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [July 14, 2023, 2:53pm UTC](https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609 "2023-07-14T14:53:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.slicer.org/u/PEC)\
**Post date:** [July 14, 2023, 2:53pm UTC](https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609/1 "2023-07-14T14:53:22Z")

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Hello, I am conducting a software research on medical image feature extraction.In order to extract medical image features, the depicted ROI should contain at least how many voxels？  
@lassoan

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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:** [July 14, 2023, 2:55pm UTC](https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609/2 "2023-07-14T14:55:15Z")

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It entirely depends on what features you want to extract for what purpose.

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**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.slicer.org/u/PEC)\
**Post date:** [July 15, 2023, 3:41am UTC](https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609/3 "2023-07-15T03:41:25Z")

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We wonder if it’s possilble to extract small lesion features(like 10 voxels) extracted from the sketched CT image,thx for your reply

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<div class="post-metadata">

**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.slicer.org/u/PEC)\
**Post date:** [July 15, 2023, 8:13am UTC](https://discourse.slicer.org/t/the-least-voxels-that-roi-should-contains/30609/4 "2023-07-15T08:13:02Z")

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By the way, I have got a tip from LIFEx’s documents that “The ROI should include at least 64 voxels for 3D ROl and 16 voxels for 2D ROl”; And this topic is connected with our cooperation with a hospital for extraction of small volume lesions by some feature extraction softwares