title: The development and test of a device for the reconstruction of 3-D position and orientation by means of a kinematic sensor assembly with rate gyroscopes and accelerometers.
abstract: In this paper, we propose a device for the Position and Orientation (P&O) reconstruction of human segmental locomotion tasks. It is based on three mono-axial accelerometers and three angular velocity sensors, geometrically arranged to form two orthogonal terns. The device was bench tested using step-by-step motor-based equipment. The characteristics of the six channels under bench test conditions were: crosstalk absent, non linearity < +/- 0.1% fs, hysteresis < 0.1% fs, accuracy 0.3% fs, overall resolution better than 0.04 deg/s, 2 x g x 10(-4). The device was validated with the stereophotogrammetric body motion analyzer during the execution of three different locomotion tasks: stand-to-sit, sit-to-stand, gait-initiation. Results obtained comparing the trajectories of the two methods showed that the errors were lower than 3 x 10(-2) m and 2 deg during a 4s of acquisition and lower than 6 x 10(-3) m and 0.2 deg during the effective duration of a locomotory task; showing that the wearable device hereby presented permits the 3-D reconstruction of the movement of the body segment to which it is affixed for time-limited clinical applications.
authors.affiliation: Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, 00161 Roma, Italy. dgiansa@iss.it
authors.forename: Daniele
authors.initials: D
authors.lastname: Giansanti
authors.forename: Giovanni
authors.initials: G
authors.lastname: Maccioni
authors.forename: Velio
authors.initials: V
authors.lastname: Macellari
mesh_terms: D000054:Acceleration; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D005684:Gait / Q000502:physiology*; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D009068:Movement / Q000502:physiology*; D010808:Physical Examination / Q000295:instrumentation* / Q000379:methods; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers