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A 40-MHz Ultrasound Transducer with an Angled Aperture for Guiding Percutaneous Revascularization of Chronic Total

Junsu Lee1, Jin Ho Chang2,3

  • 1Department of Electronic Engineering, Sogang University, Seoul 04107, Korea. leejs@sogang.ac.kr.

Sensors (Basel, Switzerland)
|November 25, 2018
PubMed

Insights

A new 40-MHz forward-looking intravascular ultrasound (FL-IVUS) transducer helps surgeons visualize calcification within chronic total occlusion (CTO) lesions. This imaging advancement aims to improve guidewire crossing success rates in complex coronary artery blockages.

Area of Science:

  • Cardiovascular medicine
  • Medical imaging technology
  • Interventional cardiology

Background:

  • Chronic total occlusion (CTO) is a complete blockage of coronary arteries, often caused by atherosclerosis.
  • Current angiography methods fail to image inside CTO lesions, leaving surgeons
  • blind
  • during guidewire crossing.
  • Guidewire crossing success rates decrease significantly (from 69.0% to 32.5%) when extensive, guidewire-impermeable calcification is present.

Purpose of the Study:

  • To report on a newly developed 40-MHz forward-looking intravascular ultrasound (FL-IVUS) transducer.
  • To enable visualization of calcification within CTO lesions.
  • To assist surgeons in making informed decisions during guidewire crossing procedures.

Main Methods:

  • Development of a novel 40-MHz FL-IVUS transducer with a single element angled aperture and guidewire passage.
  • Spherical deformation of the aperture to a 3 mm focal length for enhanced spatial resolution.
  • Optimization of the angle between the beam direction and rotation axis to 30° for effective visualization of calcification and vessel walls.

Main Results:

  • The developed FL-IVUS transducer successfully visualized calcification within CTO lesions.
  • Experimental results confirmed the transducer's capability to image the blood vessel wall.
  • The imaging facilitated decision-making for surgeons regarding guidewire advancement or procedural changes.

Conclusions:

  • The novel FL-IVUS transducer provides crucial visualization of calcification in CTO lesions.
  • This technology has the potential to improve the success rates of guidewire crossing in complex CTO interventions.
  • Enhanced intra-lesional imaging empowers surgeons to navigate challenging atherosclerotic blockages more effectively.

Keywords:
atherosclerosischronic total occlusionforward-looking IVUSguidewire crossinghigh-frequency ultrasoundintravascular ultrasound (IVUS)percutaneous coronary intervention (PCI)ultrasound transducers

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