A cool property of volume rendering is that it requires much simpler calculations than other 3D rendering problems. It's simple enough that you can use Homomorphic Encryption to calculate the rendering of _encrypted_ medical data!

Here is my summary of it[1] and the original paper[2] I found this in

[1] https://azeemba.com/posts/homomorphic-encryption-with-images...

[2] https://arxiv.org/abs/2009.02122