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    Forward-looking intravascular ultrasound (FL-IVUS) integrated into rotary atherectomy devices provides real-time imaging feedback. This enhances surgical precision for treating calcified blockages and reduces complication risks.

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    Area of Science:

    • Cardiovascular Interventions
    • Medical Imaging Technology
    • Biomedical Engineering

    Background:

    • Coronary rotational atherectomy (CRA) is crucial for treating calcified arterial blockages.
    • Lack of real-time intravascular imaging during CRA can lead to suboptimal parameter settings and surgical complications.
    • Forward-looking intravascular ultrasound (FL-IVUS) offers unique advantages for imaging severely calcified or occluded vessels.

    Purpose of the Study:

    • To develop and evaluate a visual rotary surgical instrument incorporating FL-IVUS for intraoperative feedback during CRA.
    • To investigate the impact of transducer angle parameters on image quality for FL-IVUS catheters.
    • To assess the imaging performance of the integrated FL-IVUS system in various phantoms and ex vivo tissues.

    Main Methods:

    • Designed and manufactured FL-IVUS imaging catheters with forward viewing angles of 30°, 45°, and 60°.
    • Evaluated imaging performance using wire phantoms, ex vivo porcine aorta, a vascular phantom model, and a calcified tissue substitute.
    • Assessed the influence of transducer tilt angles on spatial resolution and penetration depth.

    Main Results:

    • FL-IVUS imaging demonstrated satisfactory performance for visualizing ex vivo porcine aorta tissue.
    • Transducers with varying tilt angles exhibited comparable performance and resolution.
    • Increasing the beam's angle to the axial direction enhanced spatial resolution but reduced penetration depth.

    Conclusions:

    • Integrated FL-IVUS rotary cutting devices provide effective intracavitary information feedback.
    • This technology aids in optimizing parameter settings and evaluating rotary grinding during CRA.
    • Miniaturized, integrated FL-IVUS rotary devices facilitate real-time ultrasound feedback, potentially reducing surgical risks.