Int J Comput Assist Radiol Surg - Position error reduction in a mechanical tracking linkage for arthroscopic hip surgery.

Tópicos

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Resumo

RPOSE: Position tracking is an important aspect of many computer-aided surgical techniques. Given the obstacles of current optical, electromagnetic, and mechanical systems for medical applications, this work investigates error reduction in a new mechanical tracking system developed for arthroscopic hip surgery. This new tracking linkage addresses the current contradictory requirements of a thin, small linkage for ease of surgical use and a large, bulky linkage for increased accuracy by using (1) kinematic redundancy and (2) data averaging and curve fitting.METHOD: To reduce the position error in the proposed mechanical tracking linkage, four numerical techniques were applied to data from the linkage. Two averaging techniques and two curve fitting techniques were investigated. After implementing each numerical technique, error testing was performed to quantify improvement in performance.RESULTS: While the simple average and moving average techniques lowered the error by over 30%, these two methods were undesirable for the overall system performance. The lowest error was measured by the linear curve prediction method. This technique measured 0.552 mm of error, roughly half of the error measured by the control case. The quadratic prediction method reduced the error by 35% and had the lowest standard deviation in the measurements.CONCLUSION: The linear prediction technique was able to significantly lower the error measured by a kinematically redundant mechanical tracking linkage. While further testing is still necessary, this data suggests that a thin, small mechanical tracking linkage could achieve a high level of accuracy to be an appropriate choice for a surgical tracking application.

Resumo Limpo

rpose posit track import aspect mani computeraid surgic techniqu given obstacl current optic electromagnet mechan system medic applic work investig error reduct new mechan track system develop arthroscop hip surgeri new track linkag address current contradictori requir thin small linkag eas surgic use larg bulki linkag increas accuraci use kinemat redund data averag curv fittingmethod reduc posit error propos mechan track linkag four numer techniqu appli data linkag two averag techniqu two curv fit techniqu investig implement numer techniqu error test perform quantifi improv performanceresult simpl averag move averag techniqu lower error two method undesir overal system perform lowest error measur linear curv predict method techniqu measur mm error rough half error measur control case quadrat predict method reduc error lowest standard deviat measurementsconclus linear predict techniqu abl signific lower error measur kinemat redund mechan track linkag test still necessari data suggest thin small mechan track linkag achiev high level accuraci appropri choic surgic track applic

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