Professor Phil Butler's Wrist (IMAGE) University of Otago Caption This is an image of Professor Phil Butler's wrist, produced by the MARS spectral x-ray scanner. Credit MARS Bioimaging Ltd. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.