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    Area of Science:

    • Medical Imaging
    • Physics
    • Materials Science

    Background:

    • Conventional absorption contrast X-ray imaging lacks information obtainable through phase contrast and dark-field techniques.
    • Grating-based imaging (GBI) and speckle-based imaging (SBI) are advanced methods for multi-modal X-ray imaging.
    • A systematic comparison between GBI and SBI is currently lacking.

    Purpose of the Study:

    • To experimentally compare grating-based imaging (GBI) and speckle-based imaging (SBI) using a synchrotron X-ray source.
    • To evaluate the advantages and disadvantages of each technique for X-ray phase contrast and dark-field imaging.
    • To provide guidance for selecting the optimal imaging technique for various synchrotron-based applications.

    Main Methods:

    • Experimental comparison of GBI and SBI techniques.
    • Utilized a synchrotron radiation X-ray source.
    • Analyzed image retrieval capabilities, phase unwrapping issues, and differential phase gradient extraction.

    Main Results:

    • Speckle-based imaging (SBI) does not require phase unwrapping, a common issue with grating-based imaging (GBI).
    • SBI allows for simultaneous extraction of two orthogonal differential phase gradients via a single 1D scan.
    • GBI exhibits less stringent requirements for detector pixel size and transverse coherence length when using multiple gratings.

    Conclusions:

    • SBI presents a simpler experimental setup and overcomes phase unwrapping limitations inherent in GBI.
    • SBI's ability to extract dual orthogonal phase gradients in one scan offers significant advantages.
    • This comparative study serves as a valuable reference for researchers choosing between GBI and SBI at synchrotron facilities.