Spherical coordinates transformation pre-processing in MRI

Source code used to apply transformation from Cartesian to Spherical coordinates as a pre-processing step in Deep Learning for MRI automatic tumor segmentation.

This python code is part of the code used to train Deep Learning model in the Original Article Spherical coordinates transformation pre-processing in Deep Convolution Neural Networks for brain tumor segmentation in MRI by C. Russo et al.

Usage: python cartesian2spherical.py <input nifti file> <output nifti file>
example: python cartesian2spherical.py mri_demo.nii.gz sph_mri_demo.nii.gz