Image resolution affects tracking in vivo biplanar x-ray images of the human foot during dynamic motion

Dynamic in vivo tracking of foot bone motion is challenging due to occlusions of the many small, close-packed bones. In this study, we investigated image resolution of dynamic biplanar videoradiography data and whether it affects the performance of bone tracking when using CT-derived models. Downsampling the dynamic images caused the largest tracking improvement, model upsampling and high-resolution images did not, when compared to manual rotoscoping.