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Researchers modified intravascular ultrasound (IVUS) catheters to develop intravascular acoustic radiation force impulse (ARFI) imaging for detecting vulnerable plaque. This novel approach shows feasibility for early heart attack and stroke risk detection.

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Area of Science:

  • Cardiovascular Imaging
  • Biomedical Engineering
  • Medical Ultrasound

Background:

  • Vulnerable plaque in coronary arteries, characterized by a thin fibrous cap and lipid-rich core, is a precursor to heart attack and stroke.
  • Early detection of vulnerable plaque can significantly alter patient treatment and prevent ischemic events.
  • Previous work involved carotid plaque characterization and IVUS catheter modification for hyperthermia.

Purpose of the Study:

  • To explore the feasibility of intravascular acoustic radiation force impulse (ARFI) imaging using modified intravascular ultrasound (IVUS) catheters.
  • To adapt IVUS catheters for ARFI applications to detect vulnerable plaque in coronary arteries.
  • To investigate the potential for early detection and characterization of vulnerable plaques.

Main Methods:

  • Modified Volcano Visions (8.2 French, 9 MHz) and Volcano Platinum (3.5 French, 20 MHz) IVUS catheters by short-circuiting array elements for ARFI.
  • Utilized a Verasonics scanner with pushing pulses (180 V p-p) to acquire ARFI data.
  • Tested the modified catheters on a soft gel phantom (Young's modulus 2.9 kPa) to assess ARFI motion.

Main Results:

  • The modified IVUS catheters successfully generated radiation force for ARFI imaging.
  • Observed ARFI motion in the gel phantom ranged from 1 to 2 microns displacement and recovery.
  • Demonstrated that hardware modifications mimic potential beamforming strategies for IVUS scanners.

Conclusions:

  • Intravascular ARFI imaging using modified IVUS catheters is feasible.
  • This technology holds promise for the in vivo detection and characterization of vulnerable coronary plaques.
  • Further development could lead to improved prevention strategies for heart attack and stroke.