Proof‐of‐concept of a laser mounted endoscope for touch‐less navigated procedures. Issue 6 (4th June 2013)

• Record Type: Journal Article
• Authors: Kral, Florian; Gueler, Oezguer; Perwoeg, Martina; Bardosi, Zoltan; Puschban, Elisabeth J.; Riechelmann, Herbert; Freysinger, Wolfgang
• Is Part Of: Lasers in surgery and medicine. Volume 45:Issue 6(2013)
• Page Start: 377
• Page End: 382
• Publication Date: 2013-06-04
• Subjects: Lasers in medicine -- Periodicals; Lasers in surgery -- Periodicals; 617
• DOI: 10.1002/lsm.22148
• Languages: English
• ISSNs: 0196-8092

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="lsm22148-sec-0001" sec-type="section"> <title>Background and Objectives</title> <p>During navigated procedures a tracked pointing device is used to define target structures in the patient to visualize its position in a registered radiologic data set. When working with endoscopes in minimal invasive procedures, the target region is often difficult to reach and changing instruments is disturbing in a challenging, crucial moment of the procedure. We developed a device for touch less navigation during navigated endoscopic procedures.</p> </sec> <sec id="lsm22148-sec-0002" sec-type="section"> <title>Materials and Methods</title> <p>A laser beam is delivered to the tip of a tracked endoscope angled to its axis. Thereby the position of the laser spot in the video‐endoscopic images changes according to the distance between the tip of the endoscope and the target structure. A mathematical function is defined by a calibration process and is used to calculate the distance between the tip of the endoscope and the target. The tracked tip of the endoscope and the calculated distance is used to visualize the laser spot in the registered radiologic data set.</p> </sec> <sec id="lsm22148-sec-0003" sec-type="section"> <title>Results</title> <p>In comparison to the tracked instrument, the touch less target definition with the laser spot yielded in an over and above error of 0.12 mm. The overall application error in this experimental setup with a plastic head was 0.61 ± 0.97 mm (95% CI −1.3 to +2.5 mm).</p> </sec> <sec id="lsm22148-sec-0004" sec-type="section"> <title>Conclusion</title> <p>Integrating a laser in an endoscope and then calculating the distance to a target structure by image processing of the video endoscopic images is accurate. This technology eliminates the need for tracked probes intraoperatively and therefore allows navigation to be integrated seamlessly in clinical routine. However, it is an additional chain link in the sequence of computer‐assisted surgery thus influencing the application error. Lasers Surg. Med. 45:377–382, 2013. © 2013 Wiley Periodicals, Inc.</p> </sec> </abstract>