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Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study
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Measuring trunk orientation with a CMOS camera: feasibility and accuracy.

A-S Gissot1, G Barbieri, M Iacobelis

  • 1Service de rééducation neurologique, CHU, INSERM/U887 Motricité-Plasticité, 23 rue Gaffarel, 21079 Dijon Cedex, France. anne-sophie.gissot@chu-dijon.fr

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A new tool using a simple camera objectively measures trunk orientation in stroke patients, aiding in lateropulsion assessment and rehabilitation. This low-cost device offers accurate and reproducible postural measurements at the bedside.

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Clinical Measurement

Background:

  • Postural assessment is crucial for stroke patients.
  • Objective quantification of trunk orientation, particularly lateropulsion, is challenging at the bedside.
  • Existing methods may lack portability, cost-effectiveness, or objectivity.

Purpose of the Study:

  • To develop and validate a novel, objective tool for measuring trunk orientation.
  • To specifically assess lateropulsion in acute and subacute stroke patients.
  • To provide a cost-effective and portable bedside solution.

Main Methods:

  • Development of software to analyze 2D movement using a CMOS camera and color markers.
  • Evaluation of accuracy, reproducibility, and noise of the camera system.
  • Comparison of CMOS camera measurements with a gold-standard 3D video system (BTS SMART-e) in static and dynamic conditions.

Main Results:

  • The CMOS camera system demonstrated high accuracy (mean error: 0.05 ± 0.12 degrees) and reproducibility (SD: 0.005 degrees).
  • Measurements showed minimal noise (0.02 degrees) and high correlation with the 3D system.
  • Careful camera positioning is needed to mitigate image distortion errors; parallax error was negligible.

Conclusions:

  • This CMOS camera-based system offers an accurate, reproducible, and objective method for bedside trunk orientation measurement.
  • It represents a significant advancement in postural assessment for stroke patients, particularly for lateropulsion.
  • The tool's low cost and portability support its use in clinical rehabilitation, potentially enabling biofeedback-based training programs.