Mike Fossum, NASA (IMAGE) NASA/Johnson Space Center Caption Astronaut Mike Fossum performs a SPRINT leg muscle self scan in the Columbus laboratory of the International Space Station. Fossum powered on the USND-2 (Ultrasound 2) and VPC (Video Power Converter) hardware, and connected the VPC to HRF-1 in order to perform this activity. Credit NASA Usage Restrictions Photo credit to NASA 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.