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Flexible ultrasonic transducer array with automatic phase calibration for arteriosclerosis detection.

He Sun1, Chunyu Lv2, Linfeng Wang1

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A novel flexible ultrasonic transducer array with automatic phase calibration (FUT-APC) provides high-resolution carotid artery imaging. This wearable technology enables continuous monitoring of vascular mechanics for atherosclerosis risk assessment.

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Atherosclerosis monitoringBiomechanical assessmentFlexible ultrasonic transducerHigh-resolution ultrasound imagingPhase compensation

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Materials Science

Background:

  • Conventional ultrasound probes struggle with imaging curved surfaces like the carotid artery.
  • Accurate, continuous monitoring of vascular mechanical properties is crucial for atherosclerosis detection.

Purpose of the Study:

  • To develop a flexible ultrasonic transducer array with automatic phase calibration (FUT-APC) for enhanced carotid artery imaging.
  • To enable real-time monitoring of vascular mechanical parameters on complex geometries.

Main Methods:

  • Integrated element position sensing and real-time phase compensation using five flexible pressure sensors.
  • Reconstructed surface curvature with a low error of 0.34 mm.
  • Developed a contact pressure visualization mechanism for consistent long-term measurements.

Main Results:

  • Achieved high-resolution imaging with a -6 dB focal width of 0.74 mm and axial/lateral resolutions better than 0.75 mm and 0.93 mm, respectively.
  • Successfully captured dynamic carotid artery diameter variations and extracted mechanical parameters (stress, strain, elastic modulus).
  • Demonstrated stable operation and improved imaging quality on complex curved surfaces.

Conclusions:

  • The FUT-APC offers a wearable and accurate solution for high-resolution carotid artery imaging.
  • Enables early screening, risk assessment, and dynamic tracking of atherosclerosis.
  • Significantly improves ultrasound imaging quality on irregular geometries.