In which I describe the complexities of analysing 3D images...
3D image analysis just seems to be one of those things that is harder to do than I'd like it to be.
Before starting it is worth pointing out that with MRI you can acquire volumes in two ways - traditional 2D with multiple slices or a 3D scan. As far as this blog post is concerned these are the same.*
A common measure in clinical MRI is the volume of an organ or part of an organ. After all when someone has brain cancer - "How big is the tumour?" can be a very important question. Here are my experiences of trying to measure volumes on MRI images.
*There are differences between these two methods of acquisition but that would require a whole blog post on it's own.