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Urinary bladder volume tracking using a Kalman filter.

N K Kristiansen1, S O Sjöström, H Nygaard

  • 1Institute of Clinical Medicine, Aarhus University Hospital and University, Aarhus, Denmark. niels.kristiansen@ki.au.dk

Medical & Biological Engineering & Computing
|July 23, 2005
PubMed
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This study presents a Kalman filter for tracking urinary bladder filling using ultrasound measurements. The method enhances volume measurement precision without impacting accuracy, aiding urologic patient monitoring.

Area of Science:

  • Biomedical Engineering
  • Urology
  • Signal Processing

Background:

  • Accurate monitoring of urinary bladder filling is crucial for diagnosing and managing urologic conditions.
  • Intermittent bladder volume measurements can be imprecise, necessitating advanced signal processing techniques.
  • Existing methods may lack the precision required for real-time bladder volume tracking.

Purpose of the Study:

  • To introduce and evaluate a Kalman filter procedure for tracking urinary bladder filling.
  • To improve the precision of bladder volume measurements obtained from an ultrasonic bladder volume monitor.
  • To assess the filter's accuracy and the effectiveness of its micturition reset mechanism.

Main Methods:

  • A Kalman filter was developed using a double integrator model for bladder filling dynamics between micturitions.

Related Experiment Videos

  • A procedure to reset the Kalman filter upon detection of micturition was incorporated.
  • Experimental evaluation was conducted on seven male urologic patients during cystometry with controlled saline infusion.

    • Main Results:

    • The Kalman filter significantly improved the precision of measured bladder volumes, reducing mean absolute error by 4.2 ml (p = 0.025).
    • The filter did not significantly affect the accuracy of the volume measurements (slope p=0.92, intercept p=0.32).
    • The micturition reset procedure was successfully verified using simulated data.

    Conclusions:

    • The Kalman filter provides a precise method for tracking urinary bladder filling from intermittent ultrasonic measurements.
    • This technique enhances the reliability of bladder volume monitoring in urologic applications.
    • The developed filter offers a valuable tool for improving patient care and diagnostic accuracy in urology.