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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Split-based elevational localization of photoacoustic guidewire tip by 1D array probe using spatial impulse response.

Tomohiko Tanaka1, Ryo Imai2, Hirozumi Takeshima1

  • 1Innovative Technology Laboratory, FUJIFILM Healthcare Corporation, Tokyo, Japan.

Physics in Medicine and Biology
|February 12, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new method using ultrasound probe interference patterns to locate guidewire tips in 3D space. This technique helps track the tip

Keywords:
echo-guided interventionphotoacousticsspatial impulse responseultrasound

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Interventional Radiology

Background:

  • Photoacoustic emitters are crucial for echo-guided interventions.
  • Current methods struggle to track guidewire tips deviating from the ultrasound plane.
  • Accurate 3D localization of interventional tools is essential for patient safety.

Purpose of the Study:

  • To develop a novel method for guidewire tip localization in the elevation direction using a 1D ultrasound array probe.
  • To address the challenge of guidewire tips moving out of the standard 2D ultrasound imaging plane.
  • To improve the precision and safety of minimally invasive procedures.

Main Methods:

  • Utilized 'interference split' phenomenon observed when the photoacoustic emitter is off-plane.
  • Introduced 'split-based elevation localization (SEL)' and 'Signed SEL' for estimating absolute and signed elevation positions.
  • Developed a 'modeled split matching (MSM)' algorithm for pattern matching of split waveforms with precalculated models.

Main Results:

  • Numerical simulations confirmed the interference split phenomenon.
  • Experimental validation demonstrated successful elevation position estimation in a vessel-mimicking phantom.
  • SEL achieved a root-mean-squared error (RMSE) of 2.0 mm (0–30 mm range); Signed SEL achieved 2.4 mm RMSE and 80.8% sign accuracy (-30–30 mm range).

Conclusions:

  • The proposed SEL and Signed SEL methods enable accurate elevation localization of guidewire tip emitters.
  • This technology can provide sonographers with approximate tip positions for enhanced tracking during interventions.
  • The findings suggest potential for improved guidance and safety in echo-guided therapeutic devices.