Grimpampi, Eleni and Camomilla, Valentina and Cereatti, Andrea and Cappozzo, Aurelio (2012) Quantitative assessment of soft tissue artefact propagation to the marker cluster level. Journal of Biomechanics, Vol. 45 (Suppl. 1), S296. eISSN 1873-2380. Article.
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The instantaneous pose of a bone during activity is commonly estimated using a cluster of at least 3 non-collinear skin markers the position of which in a global frame (G) is reconstructed through stereophotogrammetry. A time-invariant clustermodel, rigidly associated with a set of local axes (L), is defined and registered with the skin markers in each sampled instant of time. Soft tissue deformation, however, engenders an artefact (STA) that affects the reconstructed position of the markers and causes a shape variation (SV) of the cluster. Because of this, both the determination of the cluster model and the registration call for optimization procedures. To this purpose several algorithms have been proposed [Andriacchi, 1998; Taylor, 2005]. The estimated pose of L embeds not only the motion of the bone relative to G, the goal of the analysis, but also the motion of L relative to the bone (CB), the latter also caused by STAs and representing an error. Thus, STAs manifest themselves at the cluster level through two components (SV and CB). This study aims to quantitatively investigate these components as a prerequisite for devising better marker placement, cluster configurations, and STA compensation algorithms.
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