Outpatient Surgery Magazine

Watch Your Step - May 2014 - Subscribe to Outpatient Surgery Magazine

Outpatient Surgery Magazine, providing current information on Surgical Services, Surgical Facility Administration, Outpatient Surgery News and Trends, OR Excellence and more.

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1 1 9 M AY 2 0 1 4 | O U T P AT I E N T S U R G E R Y M A G A Z I N E O N L I N E Great ideas for your OR The new system, using an algorithm that the research team had pre- viously constructed to help spine surgeons navigate vertebral levels, automatically matches 2D fluoroscopic images to 3D CT scans and updates them throughout the case. "Rather than adding complicated tracking systems and special mark- ers to the already busy surgical scene, we realized a method in which the imaging system is the tracker and the patient is the marker," says Dr. Siewerdsen. Testing the system on cadavers, the team has found that its results are consistently more precise than those of existing systems, deliver- ing better than 2mm of accuracy as compared to a standard of 2mm to 4mm. They're currently working to translate their methods into a system that can be studied by a wider clinical audience. "The breakthrough came when we discovered how much geometric information could be extracted from just one or two X-ray images of the patient," says computer science graduate student Ali Uneri. "From just a single frame, we achieved better than 3 millimeters of accuracy, and with 2 frames acquired with a small angular separation, we could provide surgical navigation more accurately than a conventional tracker." Better still: the system can derive this navigational information from images taken with an extremely low dose of radiation, expos- ing the patient to even less radiation than a routine intraoperative image would. — David Bernard OSE_1405_part3_Layout 1 5/8/14 2:29 PM Page 119

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