New Software Labels Patients' Vertebrae before Spine Surgery (image) Johns Hopkins Medicine Share Print E-Mail Caption LevelCheck software clearly labels each vertebra in this X-ray image taken just before a patient's spinal surgery. Note the pin to the left of L3. L and S stand for the lumbar and sacral regions of the spine, respectively. Credit The I-STAR Laboratory, The Johns Hopkins University Usage Restrictions None Share Print E-Mail 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.