Nano Dimesnion has announced that it has filed patent application too U.S Patent and Trademark Office for the 3D printing of stem cells. The patent discloses it will be using MRI and CT scans to print biological structure of the tissue or organ using 3D bioprinter and bioink materials. The patent came after concept of 3D printing stem cells weeks back.
Source: http://3dprintingindustry.com/news/will-mri-allow-print-new-organs-81236/