A feasibility study for measuring accurate tendon displacements using an audio-based fourier analysis of pulsed-wave doppler ultrasound signals

Stegman, Kelly J.; Podhorodeski, Ronald; Park, E. J.

doi:10.1109/iembs.2009.5334450

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…To collect the data needed for this work, the demodulated and filtered audible output signal from the LogicScan is sampled by a sound card (SigmaTel) in the PC, at 44.1 kHz, as shown in box F in Figure 4. 26,27 The sound card has two channels, thus preserving the tendon’s flow-directional information moving towards or away from the transducer. This signal is transferred into Matlab™ and is first filtered with a 25-point moving average filter to reduce the noise by a factor of 5.…”

Section: Methodsmentioning

confidence: 99%

Doppler ultrasound-based measurement of tendon velocity and displacement for application toward detecting user-intended motion

Stegman

Park

Dechev

2012

Proc Inst Mech Eng H

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The motivation of this research is to non-invasively monitor the wrist tendon's displacement and velocity, for purposes of controlling a prosthetic device. This feasibility study aims to determine if the proposed technique using Doppler ultrasound is able to accurately estimate the tendon's instantaneous velocity and displacement. This study is conducted with a tendon mimicking experiment consisting of two different materials: a commercial ultrasound scanner, and a reference linear motion stage set-up. Audio-based output signals are acquired from the ultrasound scanner, and are processed with our proposed Fourier technique to obtain the tendon's velocity and displacement estimates. We then compare our estimates to an external reference system, and also to the ultrasound scanner's own estimates based on its proprietary software. The proposed tendon motion estimation method has been shown to be repeatable, effective and accurate in comparison to the external reference system, and is generally more accurate than the scanner's own estimates. After establishing this feasibility study, future testing will include cadaver-based studies to test the technique on the human arm tendon anatomy, and later on live human test subjects in order to further refine the proposed method for the novel purpose of detecting user-intended tendon motion for controlling wearable prosthetic devices.

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Section: Methodsmentioning

confidence: 99%