I've written an addon for Godot that lets you view 3D image data, such as data produced by MRI and PET scans. Add it to your project and view your scan data from any direction.
Github:
https://github.com/blackears/godot_volume_layers
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0:00 Intro
0:39 Explanation of slicing
1:32 Installation
1:42 Adding the viewer to your scene
2:12 Converting your data
2:46 Setting the parameters
3:58 Outro