Elvis C S Chen1, Burton Ma2, Terry M Peters3. 1. Robarts Research Institute, Western University, London, ON, Canada. chene@robarts.ca. 2. Department of Electrical Engineering and Computer Science, York University, Toronto, ON, Canada. 3. Robarts Research Institute, Western University, London, ON, Canada.
Abstract
PURPOSE: We present a laser-based, contact-less, stylus for the purpose of fiducial registration and digitization in the context of surgical navigation. METHODS: We augmented a laser pointer with a spatial measurement device and used the laser beam as a means to locate a fiducial in 3D space. We developed a method for calibrating the orientation of the laser beam with respect to its attached tracking target. Digitization of a fiducial was formulated as a line intersection problem, and registration was formulated as a point-to-line registration problem. RESULTS: We achieved an RMS fiducial localization error of 0.63 mm for 151 measurements of 12 fiducial markers. Mean TRE values of less than 1.5 mm over the entire surface of a lumbar vertebra were achievable using 4 fiducial markers. We found that contact-based rigid registration performed carefully under near-ideal conditions outperforms contact-less registration in terms of TRE. CONCLUSION: An inexpensive contact-less stylus can be used to obtain accurate fiducial registration, which can be performed without explicit fiducial digitization.
PURPOSE: We present a laser-based, contact-less, stylus for the purpose of fiducial registration and digitization in the context of surgical navigation. METHODS: We augmented a laser pointer with a spatial measurement device and used the laser beam as a means to locate a fiducial in 3D space. We developed a method for calibrating the orientation of the laser beam with respect to its attached tracking target. Digitization of a fiducial was formulated as a line intersection problem, and registration was formulated as a point-to-line registration problem. RESULTS: We achieved an RMS fiducial localization error of 0.63 mm for 151 measurements of 12 fiducial markers. Mean TRE values of less than 1.5 mm over the entire surface of a lumbar vertebra were achievable using 4 fiducial markers. We found that contact-based rigid registration performed carefully under near-ideal conditions outperforms contact-less registration in terms of TRE. CONCLUSION: An inexpensive contact-less stylus can be used to obtain accurate fiducial registration, which can be performed without explicit fiducial digitization.
Authors: Elvis C S Chen; A Jonathan McLeod; John S H Baxter; Terry M Peters Journal: Int J Comput Assist Radiol Surg Date: 2015-04-11 Impact factor: 2.924
Authors: Amber L Simpson; Kay Sun; Thomas S Pheiffer; D Caleb Rucker; Allen K Sills; Reid C Thompson; Michael I Miga Journal: IEEE Trans Biomed Eng Date: 2014-06 Impact factor: 4.538
Authors: Amber L Simpson; Jessica Burgner; Courtenay L Glisson; S Duke Herrell; Burton Ma; Thomas S Pheiffer; Robert J Webster; Michael I Miga Journal: IEEE Trans Biomed Eng Date: 2012-08-23 Impact factor: 4.538