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23 February 2010 Splint deformation measurement: a contribution to quality control in computer assisted surgery
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Setting up a reliable and accurate reference coordinate system is a crucial part in computer assisted navigated surgery. As the use of splints is a well established technique for this purpose and any change in its geometry directly influences the accuracy of the navigation, a regular monitoring of such deformations should occur as a means of quality control. This work presents a method to quantify such deformations based on computed tomography images of a splint equipped with fiducial markers. Point-to-point registration is used to match the two data sets and some markers near to the navigation field are used to estimate the registration error. The Hausdorff Distance, describing the maximum of all minimal distances between two point sets in general, is applied to the surfaces of the models, being a measure for the overall change in geometry. Finally this method for quantification is demonstrated using a computed tomography data set of such a splint together with an artificially modified one, being an initial step to a study examining the influence of the Sterrad sterilisation system on acrylic splints.
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Christoph Weber, Michael Figl, and Kurt Schicho "Splint deformation measurement: a contribution to quality control in computer assisted surgery", Proc. SPIE 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling, 76253E (23 February 2010);

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