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Ultrafast Endoscopic Ultrasonography With Circular Array.

Qingyuan Tan, Congzhi Wang, Jiamei Liu

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    Summary
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    Ultrafast endoscopic ultrasonography (EUS) now includes a novel coherent diverging wave compounding (CDWC) method for circular arrays. This technique achieves high frame rates and image quality for advanced gastrointestinal imaging.

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    Area of Science:

    • Medical Imaging
    • Biomedical Engineering
    • Ultrasound Technology

    Background:

    • Ultrafast ultrasound imaging enables advanced applications like elastography and super-resolution vascular imaging.
    • Endoscopic ultrasonography (EUS) with circular arrays offers a wider view in the alimentary canal but lacks ultrafast capabilities.
    • Existing EUS arrays (linear, convex) have limitations compared to circular arrays for certain applications.

    Purpose of the Study:

    • To propose and implement a coherent diverging wave compounding (CDWC) imaging method for ultrafast EUS using a circular array.
    • To optimize CDWC parameters (virtual source radius, quantity) for high frame rates and image quality in EUS.
    • To demonstrate the feasibility of ultrafast EUS imaging with a custom circular array.

    Main Methods:

    • Developed a CDWC imaging method utilizing virtual acoustic point sources and time delays for synthetic transmit focusing.
    • Theoretically analyzed and experimentally verified the effects of virtual source radius (r) and quantity on image quality.
    • Conducted simulations, phantom studies, and ex-vivo experiments using an 8 MHz, 124-element circular array.

    Main Results:

    • Achieved a frame rate of 1000 frames/s with image quality comparable to multi-focus imaging.
    • Optimized CDWC by using 16 virtual sources with a virtual source radius (r) of 1.605 mm.
    • Demonstrated the successful implementation of ultrafast EUS imaging on a custom circular array.

    Conclusions:

    • The proposed CDWC method enables ultrafast imaging for endoscopic ultrasonography with circular arrays.
    • This advancement promotes the development of multi-functional EUS devices for improved gastrointestinal diagnostics.
    • Ultrafast EUS imaging with CDWC offers a promising new modality for medical diagnostics.