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X-ray computed tomography using partially coherent Fresnel diffraction with application to an optical fiber.

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    A new X-ray computed tomography (XCT) algorithm improves optical fiber reconstruction by incorporating Fresnel diffraction and Bayesian methods, reducing artifacts for greater accuracy.

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    Area of Science:

    • Physics
    • Materials Science
    • Imaging Science

    Background:

    • Partially coherent X-ray computed tomography (XCT) presents reconstruction challenges.
    • Existing methods may produce artifacts, limiting accuracy in microscale imaging.
    • Accurate reconstruction of microscale structures like optical fibers is crucial for material analysis.

    Purpose of the Study:

    • To develop and apply a novel reconstruction algorithm for partially coherent XCT.
    • To enhance the accuracy of XCT reconstructions by including Fresnel diffraction.
    • To improve the imaging of microscale objects, specifically optical fibers.

    Main Methods:

    • Developed a reconstruction algorithm for partially coherent XCT incorporating Fresnel diffraction.
    • Applied the algorithm to a laboratory-scale, tube-based XCT instrument.
    • Utilized maximum likelihood and a Bayesian method for reconstruction of a tilt series from an optical fiber.

    Main Results:

    • The algorithm successfully reconstructed a graded-index optical fiber at the micrometer scale.
    • Inclusion of Fresnel diffraction reduced specific reconstruction artifacts.
    • Bayesian prior probability distribution further minimized artifacts, leading to a more accurate reconstruction.
    • The algorithm's computing time is comparable to projective methods.

    Conclusions:

    • The developed XCT algorithm offers a significant improvement in reconstruction accuracy for partially coherent imaging.
    • The combined use of Fresnel diffraction and Bayesian methods effectively mitigates common reconstruction artifacts.
    • This approach is suitable for high-resolution laboratory-scale XCT of microscale objects.