Prosthesis Experiment (IMAGE) University of California - San Diego Caption (a) A plastic rod was used as a prosthesis surrogate. (b) The rod was coated with a pH-sensitive thin film sensor and (c) tested experimentally using a prototype ECT mapping system. Credit UC San Diego Usage Restrictions Please credit UC San Diego 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.