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214Chapter12bepositionedwiththeX-Guidesystem(NobelBiocareZürichSwitzerland)orthopedicscrewscanbeplacedusingothersystems2930andyetanother3Dguidancesystemshasbeendevelopedtoaccuratelypositioningorbitalfloorimplants31AllthesemethodsrequirespecializedtoolsoratrackingsystemthatisdevelopedforasinglepurposeARcoulddisplaythevirtualcontentintherealenvironment whichmakesapplicationmuchsimplerandcould thereforebeusedforvariouspurposesThiswillfacilitatemassadoptionofimage-guidedsurgicalapplicationsandindeedmakeARguidedsurgeryadisruptivetechnologyTECHNICALIMPROVEMENTSBeforeARcanbecomefullyimplementedintothesurgicalworkflowtherearesome technicalaspects thatneeds tobeimprovedSinceregistrationand trackingfulfillafundamentalroleinAR-guidedsurgeryvariousfutureoptimizationsaredesiredforbothaspectsFigure9severalfactorsthatwillenhancethediagnose-planning-surgery-evaluationcyclePOINT-BASEDREGISTRATIONIn Chapter 8point-basedregistration (PBR) in combination with skinmarksprovedtobeaverypracticalandsuccessfulmethodforourDIEPapplicationAlimitationofPBRisthepotentialFiducialLocalizationError(FLE)causedbytheuserwho
