Gait analysis using ultrasound and inertial sensors

Dirk Weenk, Fokke B. van Meulen, Bert-Jan J.F. van Beijnum, Ed Droog, Daniel Roetenberg, Hermie J. Hermens, Peter H. Veltink

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    Introduction and past research: Inertial sensors are great for orientation estimation, but they cannot measure relative positions of human body segments directly. In previous work we used ultrasound to estimate distances between body segments [1]. In [2] we presented an easy to use system for gait analysis in clinical practice but also in-home situations. Ultrasound range estimates were fused with data from foot-mounted inertial sensors, using an extended Kalman filter, for 3D (relative) position and orientation estimation of the feet. Validation: From estimated 3D positions we calculated step lengths and stride widths and compared this to an optical reference system for validation. Mean (±standard deviation) of absolute differences was 1.7 cm (±1.8 cm) for step lengths and 1.2 cm (±1.2 cm) for stride widths when comparing 54 walking trials of three healthy subjects. Clinical application: Next, the system presented in [2] was used in the INTERACTION project, for measuring eight stroke subjects during a 10 m walk test [3]. Step lengths, stride widths and stance and swing times were compared with the Berg balance scale score. The first results showed a correlation between step lengths and Berg balance scale scores. To draw real conclusions, more patients and also different activities will be investigated next. Future work: In future work we will extend the system with inertial sensors on the upperand lower legs and the pelvis, to be able to calculate a closed loop and improve the estimation of joint angles compared with systems containing only inertial sensors.
    Original languageEnglish
    Title of host publication5th Dutch Conference on Bio-Medical Engineering, BME 2015
    Place of PublicationEgmond aan Zee, The Netherlands
    Number of pages1
    Publication statusPublished - 22 Jan 2015
    Event5th Dutch Bio-Medical Engineering Conference, BME 2015 - Hotel Zuiderduin, Egmond aan Zee, Netherlands
    Duration: 22 Jan 201523 Jan 2015
    Conference number: 5


    Conference5th Dutch Bio-Medical Engineering Conference, BME 2015
    Abbreviated titleBME 2015
    CityEgmond aan Zee


    • BSS-Biomechatronics and rehabilitation technology
    • EWI-25684
    • IR-94111
    • METIS-312490


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