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Related Experiment Video

Updated: Oct 8, 2025

Three-Dimensional Ultrasonic Needle Tip Tracking with a Fiber-Optic Ultrasound Receiver
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Ultrasonic Needle Tracking with Dynamic Electronic Focusing.

Sunish J Mathews1, Dzhoshkun I Shakir2, Charles A Mosse1

  • 1Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK.

Ultrasound in Medicine & Biology
|January 3, 2022
PubMed
Summary

This study introduces an ultrasonic needle tracking system that enhances precision in medical procedures. Dynamic focusing significantly reduces needle tip position variability compared to fixed focusing, improving accuracy in ultrasound-guided interventions.

Keywords:
Fabry–Perot interferometerFibre-optic ultrasound sensorInterventional ultrasoundNeedle tip localizationUltrasonic needle trackingUltrasound-guided needle intervention

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Ultrasound Technology

Background:

  • Accurate needle tip identification is crucial for ultrasound-guided percutaneous interventions in regional anesthesia, fetal surgery, and cardiovascular medicine.
  • Current methods face challenges in precisely tracking needle tips during these procedures.

Purpose of the Study:

  • To develop and evaluate an ultrasonic needle tracking system that utilizes the measured needle tip location to dynamically adjust the electronic focus of an external ultrasound probe.
  • To assess the impact of electronic focal depth on needle tip tracking accuracy.

Main Methods:

  • Developed a system integrating a fiber-optic ultrasound sensor into a needle stylet for needle tip tracking.
  • Processed A-lines from the sensor to generate tracking images and estimate needle tip position.
  • Investigated the dependency of tracking image quality and needle tip position accuracy on the electronic focal depth in a water bath and clinical phantom.

Main Results:

  • Fixed electronic focus resulted in increased needle tip position variability with greater distance from the focal depth (up to 3.97 mm).
  • Dynamic focusing, adjusting the electronic focus based on needle tip location, significantly reduced variability.
  • With dynamic focusing, the maximum variability in tracked needle tip position was less than 0.31 mm.

Conclusions:

  • The developed ultrasonic needle tracking system with dynamic focusing substantially improves the accuracy of needle tip localization during ultrasound-guided procedures.
  • Dynamic electronic focusing is essential for minimizing tracking errors and enhancing the reliability of percutaneous interventions.
  • This technology holds significant potential for improving safety and efficacy in regional anesthesia, fetal surgery, and cardiovascular medicine.