ArticleIEEE transactions on ultrasonics, ferroelectrics, and frequency control2025
Optical Tracking for Freehand Swept Synthetic Aperture Imaging.
Article in IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Achieving higher resolution for deeper tissue structures remains a significant challenge in ultrasound (US) imaging due to the inherent limitations of diffraction. Swept synthetic aperture (SSA) techniques, which utilize the motion of a single transducer to effectively increase the imaging aperture, offer a promising solution. Building on SSA, we propose that freehand SSA provides a flexible approach with real-time adaptability to varying patient anatomies. This article introduces the optically tracked SSA (OT-SSA) platform, an approach that integrates external tracking to ensure accurate transducer positioning during freehand sweeps. Key sources of image degradation, such as spatial calibration error, tracking precision, and out-of-plane motion were directly analyzed and addressed within the system. In in vivo quadriceps imaging, OT-SSA reduced average lateral speckle autocorrelation size from 2.33 to 0.49 mm compared to a stationary aperture, demonstrating substantial resolution gains. The results establish OT-SSA as a robust and adaptable approach for high-resolution imaging.
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