[AstroPy] Transforming an image into polar coordinates and back to cartesian

[Maria de Juan Ovelar]

Dear all, 

I want to transform an image (array) into polar coordinates, operate on it and transform it back to cartesian. I found an entry on the stackoverflow forum with some ideas but I can't manage to recover the image in cartesian properly using those recipes...Is there any scipy or astropy function that can help?

Thanks!
Maria