The October 2014 issue of The Strad Magazine, reports on the investigation into a recently rediscovered contralto viola by Girolamo Amati. The study involved CT scanning, macro photography and 3D imaging. At the following link it is possible to watch an impressive video with a 360-degree rendering of the viola’s interior, made by Violinforensic, using scans taken at the Vienna Micro-CT Lab. 
To view the video, just follow THIS LINK