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Related Experiment Videos

Contour tracking using a knowledge-based snake algorithm to construct three-dimensional pharyngeal bolus movement.

M W Chang1, E Lin, J N Hwang

  • 1Department of Rehabilitation Medicine, University of Washington, Seattle, Washington 98195, USA.

Dysphagia
|August 31, 1999
PubMed
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This study introduces a knowledge-based Snake algorithm to accurately track 3-D pharyngeal bolus movement from videofluorography images, improving swallowing disorder analysis.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Computer Vision

Background:

  • Videofluorography (VFG) is crucial for assessing swallowing disorders, typically using separate lateral (LA) and anterior-posterior (AP) views.
  • A real-time 3-D representation of pharyngeal bolus evolution can enhance the analysis of swallowing kinematics and therapeutic strategies.

Purpose of the Study:

  • To develop and validate a knowledge-based Snake algorithm for automated 3-D contour tracking and reconstruction of pharyngeal bolus movement in VFG.
  • To quantitatively analyze the 3-D evolution and kinematics of a pharyngeal bolus during swallowing.

Main Methods:

  • Applied a knowledge-based Snake algorithm to VFG images (LA and AP views) of barium-mixed boluses (5-20 ml).
  • Used internal (smoothness) and external (boundary fitting) constraints, incorporating pharyngeal image knowledge to enhance accuracy.

Related Experiment Videos

  • Traced 3-D bolus movement assuming elliptic cross-sectional geometry and generated a 3-D movie of bolus transport.

    • Main Results:

    • The algorithm demonstrated satisfactory efficiency, reproducibility, and accuracy in tracing pharyngeal bolus boundaries.
    • Successfully estimated front/tail velocities of the bolus movement.
    • Generated a 3-D visualization of pharyngeal bolus transport.

    Conclusions:

    • The knowledge-based Snake search algorithm provides an accurate and efficient method for tracing 3-D pharyngeal bolus movement.
    • This technique offers a valuable tool for analyzing swallowing kinematics and informing dysphagia treatment strategies.