Precision-Guided Epidurals (image) The Optical Society Caption Results of OCT-guided insertion are shown. A)The porcine spine used for experiment. B) Anatomy of lumbar spine (sagittal view). C) Images acquired by GRIN needle device corresponding to different tissues. Credit Qinggong Tang Usage Restrictions Include caption & credit 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.