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Related Experiment Videos

Doppler catheter tip localization using color enhancement

L J Frazin1, M J Vonesh, A S Yaacoub

  • 1Department of Medicine, Northwestern University, Chicago, Illinois 60611.

Catheterization and Cardiovascular Diagnosis
|May 1, 1994
PubMed
Summary
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This study shows that Doppler catheter ultrasound emissions can identify its 3D position using color Doppler patterns. This advances non-fluoroscopic catheterization guidance by improving tip visualization.

Area of Science:

  • Medical Imaging
  • Cardiovascular Interventions
  • Ultrasound Technology

Background:

  • Doppler catheters enable non-fluoroscopic retrograde catheterization of the aortic root and left ventricle.
  • A key challenge is visualizing the Doppler catheter tip, as crossing points can be mistaken for the tip.

Purpose of the Study:

  • To determine if Doppler catheter ultrasound emissions can be used for 3D positioning via conventional echocardiography.
  • To investigate color Doppler patterns for identifying the Doppler catheter tip.

Main Methods:

  • In vitro trials using a Doppler catheter, velocimeter, and 5 MHz imaging transducer with color Doppler.
  • In vivo investigation in dog aorta using Doppler retrograde guidance and transesophageal echocardiography.
  • Synchronized water bath trials to analyze physical mechanisms of tip visualization.

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Main Results:

  • Distinct color Doppler banded patterns were observed, demarcating the Doppler catheter tip.
  • Tip identification was successful in various angles within the beam width.
  • A 40-degree blind cone directly away from the transducer was noted as an exception.

Conclusions:

  • Ultrasound emissions from Doppler catheters can be utilized for 3D localization using echocardiography.
  • Color Doppler patterns offer a method for identifying the catheter tip, enhancing guidance.
  • This technique has potential to improve safety and accuracy in catheter-based procedures.