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Compton scatter densitometry with polychromatic sources.

P R Duke, J A Hanson

    Medical Physics
    |September 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    X-ray tubes offer a viable alternative to monochromatic sources for Compton scatter densitometry (CSD). Their high activity and small focal spots can overcome limitations in statistical precision, counting times, and spatial resolution for CSD applications.

    Area of Science:

    • Medical Physics
    • Radiation Detection and Measurement

    Background:

    • Compton scatter densitometry (CSD) is a technique used for measuring material density.
    • Traditional CSD often uses monochromatic sources, which can have limitations.

    Purpose of the Study:

    • To theoretically evaluate the use of x-ray tubes as radiation sources for CSD.
    • To define bias correction factors (bcf's) for comparing monochromatic and x-ray tube CSD devices.

    Main Methods:

    • Theoretical evaluation of x-ray tubes for CSD.
    • Computer modeling to determine bias correction factors (bcf's).
    • Comparison of x-ray tube CSD with monochromatic CSD for various materials (nylon, muscle, bone).

    Main Results:

    • X-ray tube spectra (100-kVp with Pb filtration) showed minimal bias (0.008-0.34%) compared to a 70-keV monochromatic source.

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  • This bias is insignificant given typical multiple scatter errors.
  • X-ray tubes offer high equivalent activities (10-80 TBq) and small focal spots (1.0-2.0 mm).

    • Conclusions:

    • X-ray tubes are a promising radiation source for Compton scatter densitometry.
    • The use of x-ray tubes can potentially resolve issues with statistical precision, counting times, and spatial resolution in CSD.