Inclusion Criteria:  Patients that require exposure of bony posterior spine anatomy for localization as standard of care. Have had a CT scan performed prior to the procedure. Clinically planned for spine surgery. Able to provide written informed consent from subject, using IRB approved consent form, and agrees to comply with protocol requirements.  Exclusion Criteria:  Language problems that would prevent from properly understanding instructions. Patients less than 18 years of age. Requirement of an interpreter. Patients who are excluded from consideration for the surgical procedure are therefore excluded from the research study. Special populations: pregnant women, prisoners. Minimally invasive spine surgery that does not expose the necessary bone/s. Spine surgery without posterior exposure.