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Related Experiment Videos

Coherent scatter in diagnostic radiology.

P C Johns, M J Yaffe

    Medical Physics
    |January 1, 1983
    PubMed
    Summary

    Coherent scatter, often overlooked in diagnostic radiology, significantly degrades image contrast. This effect is substantial even with grids, particularly in lower-energy imaging like mammography.

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    Area of Science:

    • Medical Physics
    • Radiological Imaging
    • Diagnostic Radiology

    Background:

    • Coherent scatter is typically disregarded in diagnostic radiology due to its small cross-section and perceived indistinguishability from primary radiation.
    • Previous assumptions overlooked the impact of coherently scattered photons on image quality.

    Purpose of the Study:

    • To investigate the significance of coherent scatter in diagnostic radiology.
    • To quantify the contribution of coherent scatter to image degradation and scattered radiation.
    • To evaluate the effectiveness of grids in mitigating coherent scatter.

    Main Methods:

    • Utilized single-scatter calculations to analyze photon behavior.
    • Quantified coherent scatter contributions in abdominal radiography with and without grids.
    • Compared coherent scatter's impact across different energy examinations, including mammography.

    Main Results:

    • Coherently scattered photons diverge sufficiently to degrade image contrast.
    • Coherent scatter constitutes a significant fraction of total scattered energy fluence.
    • Grids are less effective against coherent single scatter compared to incoherent and multiple scatter.
    • In abdominal radiography, coherent first scatter represents a notable percentage of total scatter and primary fluence, both before and after grid application.
    • Coherent scatter is more prominent in lower-energy imaging modalities like mammography.

    Conclusions:

    • Coherent scatter is a crucial factor impacting image contrast in diagnostic radiology.
    • Standard scatter reduction techniques like grids are less effective against coherent scatter.
    • The impact of coherent scatter is more pronounced in lower-energy imaging, necessitating further consideration in modalities like mammography.

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