# spect ct fusion

**URL:** <https://discourse.slicer.org/t/spect-ct-fusion/6814>\
**Category:** Support\
**Created:** [May 16, 2019, 12:33pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814 "2019-05-16T12:33:37Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![kotzasm](https://avatars.discourse-cdn.com/v4/letter/k/f9ae1b/32.png) [@kotzasm](https://discourse.slicer.org/u/kotzasm)\
**Post date:** [May 16, 2019, 12:33pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/1 "2019-05-16T12:33:37Z")

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Operating system: windows  
Slicer version:4.10.1  
Expected behavior:  
Actual behavior:  
how can I fuse SPECT and CT dcm images and perform roi segmentation simultaneously on both data sets in order to get the ROI counts?  
Thanks in advance

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**Author:** ![fbaerenfaenger](https://avatars.discourse-cdn.com/v4/letter/f/a698b9/32.png) [@fbaerenfaenger](https://discourse.slicer.org/u/fbaerenfaenger)\
**Post date:** [February 16, 2021, 7:02pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/2 "2021-02-16T19:02:50Z")

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Hi,  
Could you find a solution for your problem?

Best regards

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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:** [February 16, 2021, 7:35pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/3 "2021-02-16T19:35:02Z")

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I don’t think there should be a problem at all. To get started with image segmentation in Slicer, you can check out this [documentation page](https://slicer.readthedocs.io/en/latest/user_guide/image_segmentation.html). If you have any specific questions then let us know.

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**Author:** ![jw\_yi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jw_yi/32/16310_2.png) [@jw\_yi](https://discourse.slicer.org/u/jw_yi)\
**Post date:** [August 16, 2022, 2:41pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/4 "2022-08-16T14:41:14Z")

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Fusion of reconstructed SPECT images with CT is not a problem, however, it seems 3D slicer cannot show the counts in the ROI, but only voxels in the ROI. I wonder if there is any solution?  
Thanks so much!!

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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:** [August 16, 2022, 3:52pm UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/5 "2022-08-16T15:52:50Z")

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You can get several metrics of a segmented region of an image (not just the volume, but mean, minimum, maximum, standard deviation, etc.) using Segment Statistics module. Would this be sufficient for you?

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**Author:** ![jw\_yi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jw_yi/32/16310_2.png) [@jw\_yi](https://discourse.slicer.org/u/jw_yi)\
**Post date:** [August 17, 2022, 5:25am UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/6 "2022-08-17T05:25:30Z")

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Thank you so much, Lassoan. however, counts in the ROI is a specific parameter in nuclear medicine, it dose not parallel to the Voxel or volume.It just like SUV in PET, but not a normalized paramter. It seems that in the Segment statistics module, i can’t find this parameter.

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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:** [August 17, 2022, 10:27am UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/7 "2022-08-17T10:27:05Z")

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You need to compute the quantity you want to measure (“counts”) using numpy, scipy, or any higher-level library available for this in Python or C++. Then you can use Segment Statistics module to compute statistics on it in selected regions.

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**Author:** ![jw\_yi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jw_yi/32/16310_2.png) [@jw\_yi](https://discourse.slicer.org/u/jw_yi)\
**Post date:** [August 18, 2022, 2:02am UTC](https://discourse.slicer.org/t/spect-ct-fusion/6814/8 "2022-08-18T02:02:26Z")

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Thank you，Lassoan！I’ll have a try!