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Distortion in diffraction tomography caused by multiple scattering.

M Azimi, A C Kak

    IEEE Transactions on Medical Imaging
    |January 1, 1983
    PubMed
    Summary
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    A new computational method reveals that multiple scattering significantly distorts images of multicomponent objects, even with weak scattering components. This challenges current diffraction tomography algorithms, highlighting the need for advanced scattering calculations.

    Area of Science:

    • Computational electromagnetics
    • Wave scattering theory
    • Image reconstruction

    Background:

    • First-order approximations (Born, Rytov) limit current diffraction tomography.
    • Multicomponent objects present complex scattering scenarios.
    • Understanding multiple scattering is crucial for accurate imaging.

    Purpose of the Study:

    • Introduce a novel computational procedure for calculating true forward scattered fields.
    • Investigate the impact of multiple scattering on multicomponent objects.
    • Evaluate the performance of existing diffraction tomography algorithms under violated assumptions.

    Main Methods:

    • Developed a new computational procedure for "true" forward scattered field calculation.
    • Performed computer simulations for multicomponent objects.

    Related Experiment Videos

  • Extended results to include second-order scattering effects.
  • Generalized procedure for higher-order scattering.

    • Main Results:

    • Multiple scattering effects become significant when weakly scattering components block each other.
    • Scattering effects are negligible when large, strongly scattering components do not block each other.
    • Simulations demonstrate severe distortions in multicomponent objects due to multiple scattering, even with 5% inhomogeneities.

    Conclusions:

    • The developed computational procedure accurately calculates forward scattered fields beyond first-order approximations.
    • Multiple scattering significantly impacts image reconstruction accuracy in diffraction tomography.
    • Existing algorithms fail when the first-order scattering assumption is violated, introducing artifacts.