Ambulatory Estimation of Relative Foot Positions using Ultrasound

D. Weenk, Michiel van der Coelen, Arno A.G. Geessink, Frank J. van der Hoek, Bart Verstoep, H.G. Kortier, Fokke van Meulen, Bernhard J.F. van Beijnum, Petrus H. Veltink

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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Abstract

The recording of human movement is used for biomedical applications like physical therapy and sports training. Over the last few years inertial sensors have been proven to be a useful ambulatory alternative to traditional optical systems. An example of a successful application is the instrumented shoe, which contains two 6D force/moment sensors beneath the heel and the forefoot and two inertial sensors rigidly attached to the force/moment sensors [1]. These shoes can be used for ambulatory assessment of walking kinetics and kinematics. The relative position of the feet is currently not measured directly but estimated from double integration of feet accelerations. However, this method immediately leads to large position errors (drift) when the estimated inertial accelerations are inaccurate. In this study we investigated the ambulatory estimation of the relative positions of the feet using ultrasound transducers. On one shoe we mounted a 400PT120 Air Ultrasonic Ceramic Transducer (13 mm diameter, 10 mm height, 85º beam angle) sending a 40 kHz pulse to a similar transducer on the other shoe. Using the time of flight, the distance is estimated. Under static conditions a mean error of 5.7 ±0.8 mm was obtained over a range of 5 till 75 cm [2]. From this pilot study we concluded that the distance between the feet can be estimated ambulatory using small and low-cost ultrasound transducers. Future research includes the use of multiple transducers on each foot for a distance measure during different daily-life activities. Also the relative positions of the feet will be investigated by fusing the distance estimates with inertial sensor data.
Original languageUndefined
Title of host publicationFourth Dutch Conference on Bio-Medical Engineering
Place of PublicationEgmond aan Zee, The Netherlands
PublisherBME
Pages155-155
Number of pages1
ISBN (Print)not assigned
Publication statusPublished - 24 Jan 2013
Event4th Dutch Bio-Medical Engineering Conference, BME 2013 - Hotel Zuiderduin, Egmond aan Zee, Netherlands
Duration: 24 Jan 201325 Jan 2013
Conference number: 4
http://www.bme2013.nl/

Publication series

Name
PublisherBME

Conference

Conference4th Dutch Bio-Medical Engineering Conference, BME 2013
Abbreviated titleBME
CountryNetherlands
CityEgmond aan Zee
Period24/01/1325/01/13
OtherFourth Dutch BME Conference
Internet address

Keywords

  • EWI-23013
  • METIS-296274
  • IR-83739
  • BSS-Biomechatronics and rehabilitation technology

Cite this

Weenk, D., van der Coelen, M., Geessink, A. A. G., van der Hoek, F. J., Verstoep, B., Kortier, H. G., ... Veltink, P. H. (2013). Ambulatory Estimation of Relative Foot Positions using Ultrasound. In Fourth Dutch Conference on Bio-Medical Engineering (pp. 155-155). Egmond aan Zee, The Netherlands: BME.
Weenk, D. ; van der Coelen, Michiel ; Geessink, Arno A.G. ; van der Hoek, Frank J. ; Verstoep, Bart ; Kortier, H.G. ; van Meulen, Fokke ; van Beijnum, Bernhard J.F. ; Veltink, Petrus H. / Ambulatory Estimation of Relative Foot Positions using Ultrasound. Fourth Dutch Conference on Bio-Medical Engineering. Egmond aan Zee, The Netherlands : BME, 2013. pp. 155-155
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title = "Ambulatory Estimation of Relative Foot Positions using Ultrasound",
abstract = "The recording of human movement is used for biomedical applications like physical therapy and sports training. Over the last few years inertial sensors have been proven to be a useful ambulatory alternative to traditional optical systems. An example of a successful application is the instrumented shoe, which contains two 6D force/moment sensors beneath the heel and the forefoot and two inertial sensors rigidly attached to the force/moment sensors [1]. These shoes can be used for ambulatory assessment of walking kinetics and kinematics. The relative position of the feet is currently not measured directly but estimated from double integration of feet accelerations. However, this method immediately leads to large position errors (drift) when the estimated inertial accelerations are inaccurate. In this study we investigated the ambulatory estimation of the relative positions of the feet using ultrasound transducers. On one shoe we mounted a 400PT120 Air Ultrasonic Ceramic Transducer (13 mm diameter, 10 mm height, 85º beam angle) sending a 40 kHz pulse to a similar transducer on the other shoe. Using the time of flight, the distance is estimated. Under static conditions a mean error of 5.7 ±0.8 mm was obtained over a range of 5 till 75 cm [2]. From this pilot study we concluded that the distance between the feet can be estimated ambulatory using small and low-cost ultrasound transducers. Future research includes the use of multiple transducers on each foot for a distance measure during different daily-life activities. Also the relative positions of the feet will be investigated by fusing the distance estimates with inertial sensor data.",
keywords = "EWI-23013, METIS-296274, IR-83739, BSS-Biomechatronics and rehabilitation technology",
author = "D. Weenk and {van der Coelen}, Michiel and Geessink, {Arno A.G.} and {van der Hoek}, {Frank J.} and Bart Verstoep and H.G. Kortier and {van Meulen}, Fokke and {van Beijnum}, {Bernhard J.F.} and Veltink, {Petrus H.}",
note = "http://www.bme2013.nl/program/show_slot/37",
year = "2013",
month = "1",
day = "24",
language = "Undefined",
isbn = "not assigned",
publisher = "BME",
pages = "155--155",
booktitle = "Fourth Dutch Conference on Bio-Medical Engineering",

}

Weenk, D, van der Coelen, M, Geessink, AAG, van der Hoek, FJ, Verstoep, B, Kortier, HG, van Meulen, F, van Beijnum, BJF & Veltink, PH 2013, Ambulatory Estimation of Relative Foot Positions using Ultrasound. in Fourth Dutch Conference on Bio-Medical Engineering. BME, Egmond aan Zee, The Netherlands, pp. 155-155, 4th Dutch Bio-Medical Engineering Conference, BME 2013, Egmond aan Zee, Netherlands, 24/01/13.

Ambulatory Estimation of Relative Foot Positions using Ultrasound. / Weenk, D.; van der Coelen, Michiel; Geessink, Arno A.G.; van der Hoek, Frank J.; Verstoep, Bart; Kortier, H.G.; van Meulen, Fokke; van Beijnum, Bernhard J.F.; Veltink, Petrus H.

Fourth Dutch Conference on Bio-Medical Engineering. Egmond aan Zee, The Netherlands : BME, 2013. p. 155-155.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

TY - GEN

T1 - Ambulatory Estimation of Relative Foot Positions using Ultrasound

AU - Weenk, D.

AU - van der Coelen, Michiel

AU - Geessink, Arno A.G.

AU - van der Hoek, Frank J.

AU - Verstoep, Bart

AU - Kortier, H.G.

AU - van Meulen, Fokke

AU - van Beijnum, Bernhard J.F.

AU - Veltink, Petrus H.

N1 - http://www.bme2013.nl/program/show_slot/37

PY - 2013/1/24

Y1 - 2013/1/24

N2 - The recording of human movement is used for biomedical applications like physical therapy and sports training. Over the last few years inertial sensors have been proven to be a useful ambulatory alternative to traditional optical systems. An example of a successful application is the instrumented shoe, which contains two 6D force/moment sensors beneath the heel and the forefoot and two inertial sensors rigidly attached to the force/moment sensors [1]. These shoes can be used for ambulatory assessment of walking kinetics and kinematics. The relative position of the feet is currently not measured directly but estimated from double integration of feet accelerations. However, this method immediately leads to large position errors (drift) when the estimated inertial accelerations are inaccurate. In this study we investigated the ambulatory estimation of the relative positions of the feet using ultrasound transducers. On one shoe we mounted a 400PT120 Air Ultrasonic Ceramic Transducer (13 mm diameter, 10 mm height, 85º beam angle) sending a 40 kHz pulse to a similar transducer on the other shoe. Using the time of flight, the distance is estimated. Under static conditions a mean error of 5.7 ±0.8 mm was obtained over a range of 5 till 75 cm [2]. From this pilot study we concluded that the distance between the feet can be estimated ambulatory using small and low-cost ultrasound transducers. Future research includes the use of multiple transducers on each foot for a distance measure during different daily-life activities. Also the relative positions of the feet will be investigated by fusing the distance estimates with inertial sensor data.

AB - The recording of human movement is used for biomedical applications like physical therapy and sports training. Over the last few years inertial sensors have been proven to be a useful ambulatory alternative to traditional optical systems. An example of a successful application is the instrumented shoe, which contains two 6D force/moment sensors beneath the heel and the forefoot and two inertial sensors rigidly attached to the force/moment sensors [1]. These shoes can be used for ambulatory assessment of walking kinetics and kinematics. The relative position of the feet is currently not measured directly but estimated from double integration of feet accelerations. However, this method immediately leads to large position errors (drift) when the estimated inertial accelerations are inaccurate. In this study we investigated the ambulatory estimation of the relative positions of the feet using ultrasound transducers. On one shoe we mounted a 400PT120 Air Ultrasonic Ceramic Transducer (13 mm diameter, 10 mm height, 85º beam angle) sending a 40 kHz pulse to a similar transducer on the other shoe. Using the time of flight, the distance is estimated. Under static conditions a mean error of 5.7 ±0.8 mm was obtained over a range of 5 till 75 cm [2]. From this pilot study we concluded that the distance between the feet can be estimated ambulatory using small and low-cost ultrasound transducers. Future research includes the use of multiple transducers on each foot for a distance measure during different daily-life activities. Also the relative positions of the feet will be investigated by fusing the distance estimates with inertial sensor data.

KW - EWI-23013

KW - METIS-296274

KW - IR-83739

KW - BSS-Biomechatronics and rehabilitation technology

M3 - Conference contribution

SN - not assigned

SP - 155

EP - 155

BT - Fourth Dutch Conference on Bio-Medical Engineering

PB - BME

CY - Egmond aan Zee, The Netherlands

ER -

Weenk D, van der Coelen M, Geessink AAG, van der Hoek FJ, Verstoep B, Kortier HG et al. Ambulatory Estimation of Relative Foot Positions using Ultrasound. In Fourth Dutch Conference on Bio-Medical Engineering. Egmond aan Zee, The Netherlands: BME. 2013. p. 155-155