# LongitudinalPETCT **URL:** \ **Category:** Support\ **Created:** [November 20, 2020, 2:15pm UTC](https://discourse.slicer.org/t/longitudinalpetct/14709 "2020-11-20T14:15:08Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Jakub\_Mitura](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jakub_mitura/32/8858_2.png) [@Jakub\_Mitura](https://discourse.slicer.org/u/Jakub_Mitura)\ **Post date:** [November 20, 2020, 2:15pm UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/1 "2020-11-20T14:15:08Z")
System : Windows 10 Version of 3dSlicer 4.11.20200930 When I try to load PET/CT data I got information that I should install LongitudinalPETCT extension Hovewer when I query the Extension manager nothing shows up, what can be done? In Nuclear Medicine Category I have only this ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/c/dc6f62cc1eab01f4ec7fec0b0e2bd4d39492bf56.png) query also do not help ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/a/aaa4de52b1cd96d3d066a32790cc805687daadc8.png) ---
**Author:** ![wintermute](https://avatars.discourse-cdn.com/v4/letter/w/e19b73/32.png) [@wintermute](https://discourse.slicer.org/u/wintermute)\ **Post date:** [April 28, 2021, 5:34am UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/2 "2021-04-28T05:34:49Z")
I wish to know the same. My Mac reported the same issue but I couldn’t find such an extension in the Extension Manager… ---
**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 28, 2021, 7:13pm UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/3 "2021-04-28T19:13:59Z")
That’s a somewhat old extension and the original developer is not around as far as I know. It would be great if someone wanted to adopt it and bring it up to the current codebase. It may happen eventually if someone needs this, but volunteers could help move this forward more quickly. ---
**Author:** ![Jakub\_Mitura](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jakub_mitura/32/8858_2.png) [@Jakub\_Mitura](https://discourse.slicer.org/u/Jakub_Mitura)\ **Post date:** [May 8, 2021, 10:14am UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/4 "2021-05-08T10:14:44Z")
Eventually I would like to help it, I need to first complete some other projects, Yet I have some problems with joining PET and CT data - I am able to visualize them separately but do not see how to display one over the other (clicking the eye icon next to the images do not work); link to the data below [https://wwsi365-my.sharepoint.com/:f:/g/personal/s9956jm\_ms\_wwsi\_edu\_pl/Eq4W77ZBPhhPjwLM8SPxXOUB\_c9z2vPTJp3TCoILFJqFNQ?e=YgzzPl](https://wwsi365-my.sharepoint.com/:f:/g/personal/s9956jm_ms_wwsi_edu_pl/Eq4W77ZBPhhPjwLM8SPxXOUB_c9z2vPTJp3TCoILFJqFNQ?e=YgzzPl) ---
**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:** [May 8, 2021, 3:59pm UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/5 "2021-05-08T15:59:06Z")
That’s a huge download. If you still need help can you post just pet and ct data? In any case, you can use the [slice view controller](https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#slice-view) to set the ct in the background and pet in the foreground and then use the Foreground volume opacity slider to adjust the fusion. HTH ---
**Author:** ![Jakub\_Mitura](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jakub_mitura/32/8858_2.png) [@Jakub\_Mitura](https://discourse.slicer.org/u/Jakub_Mitura)\ **Post date:** [May 11, 2021, 10:12am UTC](https://discourse.slicer.org/t/longitudinalpetct/14709/6 "2021-05-11T10:12:45Z")
Thank You it works !