Intraoral vertical ramus osteotomy (IMAGE) The University of Hong Kong Caption Intraoral vertical ramus osteotomy (IVRO): (Left) The pre-operative virtual surgical planning (red frame); (Right) The post-operative CT scan (red frame). Credit The University of Hong Kong Usage Restrictions N/A License Original 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.