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Vector Flow Visualization of Urinary Flow Dynamics in a Bladder Outlet Obstruction Model.

Takuro Ishii1, Billy Y S Yiu1, Alfred C H Yu1

  • 1Schlegel Research Institute for Aging and Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada.

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Summary

Vector projectile imaging (VPI) non-invasively visualizes urinary flow dynamics. This technique successfully differentiated normal and bladder outlet (BO) obstructed urinary tracts, revealing flow jets and vortices in diseased models.

Keywords:
Doppler ultrasoundHigh frame rate imagingUrinary flowUrinary tract phantomVector flow visualizationVoiding dysfunction

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Imaging

Background:

  • Voiding dysfunction due to bladder outlet obstruction significantly alters urinary tract flow dynamics.
  • Non-invasive, time-resolved imaging of these dynamics is crucial for understanding and diagnosing such conditions.
  • Existing methods may lack the temporal resolution or non-invasive nature required for detailed flow analysis.

Purpose of the Study:

  • To apply Vector Projectile Imaging (VPI) for non-invasive, time-resolved visualization of urinary tract flow dynamics.
  • To assess VPI's capability in differentiating flow patterns between normal and bladder outlet obstructed urethral tracts.
  • To evaluate VPI's effectiveness in characterizing flow alterations associated with voiding dysfunction.

Main Methods:

  • Development of an anthropomorphic urethral tract phantom simulating normal and bladder outlet obstructed conditions.
  • Application of Vector Projectile Imaging (VPI), a novel flow visualization technique operating at 10,000 fps.
  • Acquisition and analysis of VPI cine loops to reconstruct spatiotemporal flow vector fields under controlled pressures.

Main Results:

  • VPI successfully depicted distinct differences in flow dynamics between normal and obstructed urinary tract models.
  • In the obstructed model, VPI identified a pronounced flow jet and vortices within the prostatic urethra.
  • Peak flow velocity in the obstructed model reached 2.43 m/s, significantly higher than the normal model's 1.52 m/s, aligning with CFD simulations.

Conclusions:

  • Vector Projectile Imaging (VPI) is a feasible technique for non-invasively examining internal flow characteristics in the urethral tract.
  • VPI can effectively visualize and quantify flow alterations associated with voiding dysfunction and bladder outlet obstruction.
  • This technology holds promise for improved diagnosis and understanding of urinary tract flow pathologies.