3D Shepp-Logan Phantom

3D extension of Matlab's phantom()

A 3D extension of MATLAB's phantom function - generates a phantom consisting of an arbitrary number of ellipsoids in 3D.

Originally written by Matthias Schabel and extended by Patrick Bolan to support anisotropic phantom dimensions.

I had some memory issues while generating larger phantoms, so I improved the code's memory efficiency (using two 2D meshgrids + a for-loop instead of three 3D meshgrids). The function also supports optional command window outputs and the ability to choose the output datatype (single/double).