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Hi Mark, That's what I thought initially as well, but since the question is how many *whole *cubes can one fit into the sphere, I think the formula should be a different one, i.e. one that takes into account the fact that not every single cubed mm of the spherical volume will actually be usable by the cubes (for instance, the areas close to the surface of the sphere). ANyway, if the problem is not trivial from a 3D geometry point of view, then I should probably not concern myself with reporting how many (whole) voxels the 8000 mm^3 spherical volume actually contains. F. On 6 August 2014 09:31, Mark Jenkinson <[log in to unmask]> wrote: > Hi, > > Unless I'm missing something here, the answer is 8000: i.e. 8000/1=8000 (!) > Each voxel just has a volume of 1mm^3. > If you've measured the volume inside the sphere to be 8000 mm^3, then it > is as simple as this. > > All the best, > Mark > > > On 5 Aug 2014, at 21:03, Francesco Puccettone < > [log in to unmask]> wrote: > > > Hello, > > > > I have a mask defined in FSL that has a volume of 8000 mm^3, and I need > to find how many whole voxels that corresponds to. I find myself struggling > with this apparently simple geometry problem: how many 1x1x1 mm cubes can > you fit into a 8000 mm^3 sphere? > > > > Can anyone help please? :-} > > > > Thanks! > > > > Francesco >