Med Biol Eng Comput - In vitro quantification of the performance of model-based mono-planar and bi-planar fluoroscopy for 3D joint kinematics estimation.

Tópicos

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Resumo

Model-based mono-planar and bi-planar 3D fluoroscopy methods can quantify intact joints kinematics with performance/cost trade-off. The aim of this study was to compare the performances of mono- and bi-planar setups to a marker-based gold-standard, during dynamic phantom knee acquisitions. Absolute pose errors for in-plane parameters were lower than 0.6?mm or 0.6? for both mono- and bi-planar setups. Mono-planar setups resulted critical in quantifying the out-of-plane translation (error?<?6.5?mm), and bi-planar in quantifying the rotation along bone longitudinal axis (error?<?1.3?). These errors propagated to joint angles and translations differently depending on the alignment of the anatomical axes and the fluoroscopic reference frames. Internal-external rotation was the least accurate angle both with mono- (error?<?4.4?) and bi-planar (error?<?1.7?) setups, due to bone longitudinal symmetries. Results highlighted that accuracy for mono-planar in-plane pose parameters is comparable to bi-planar, but with halved computational costs, halved segmentation time and halved ionizing radiation dose. Bi-planar analysis better compensated for the out-of-plane uncertainty that is differently propagated to relative kinematics depending on the setup. To take its full benefits, the motion task to be investigated should be designed to maintain the joint inside the visible volume introducing constraints with respect to mono-planar analysis.

Resumo Limpo

modelbas monoplanar biplanar d fluoroscopi method can quantifi intact joint kinemat performancecost tradeoff aim studi compar perform mono biplanar setup markerbas goldstandard dynam phantom knee acquisit absolut pose error inplan paramet lower mm mono biplanar setup monoplanar setup result critic quantifi outofplan translat errormm biplanar quantifi rotat along bone longitudin axi error error propag joint angl translat differ depend align anatom axe fluoroscop refer frame internalextern rotat least accur angl mono error biplanar error setup due bone longitudin symmetri result highlight accuraci monoplanar inplan pose paramet compar biplanar halv comput cost halv segment time halv ioniz radiat dose biplanar analysi better compens outofplan uncertainti differ propag relat kinemat depend setup take full benefit motion task investig design maintain joint insid visibl volum introduc constraint respect monoplanar analysi

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