Dear expert,
There is no PyTomography Extension in 3D Slicer version 5.8.1.
Please help me add it.
Thank you.
That is correct. There is no such extension available through the Slicer extensions manager. Are you thinking about Add SlicerSPECTRecon extension by ObedDzik · Pull Request #2083 · Slicer/ExtensionsIndex · GitHub which is under review?