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Related Concept Videos

Nuclear Power02:36

Nuclear Power

Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...

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Updated: May 16, 2026

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Spherical lead shields for megavoltage teletherapy.

R A Morrison

    Radiology
    |May 1, 1978
    PubMed
    Summary

    A novel method for creating custom lead shields for megavoltage teletherapy was developed. These focused shields maintain penumbra width effectively, unlike nonfocused ones, improving radiation therapy precision.

    Area of Science:

    • Medical Physics
    • Radiation Oncology
    • Biomedical Engineering

    Background:

    • Megavoltage teletherapy requires precise radiation delivery.
    • Traditional lead shields can have limitations in maintaining beam characteristics at varying distances.
    • Individualized shielding is crucial for patient safety and treatment efficacy.

    Purpose of the Study:

    • To introduce a new manufacturing method for individualized, focused lead shields for megavoltage teletherapy.
    • To evaluate the performance of these focused shields compared to nonfocused shields.
    • To assess the impact of shield design on radiation beam penumbra maintenance.

    Main Methods:

    • Development of a novel manufacturing process for custom-fit lead shields.
    • Utilizing computerized film dosimetry for quantitative analysis.

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  • Measuring penumbra width maintenance under varying beam conditions.

    • Main Results:

    • The new focused lead shields demonstrated superior maintenance of penumbra width.
    • Performance was consistent even as the distance between the beam edge and central axis increased.
    • Nonfocused shields showed less consistent penumbra maintenance.

    Conclusions:

    • The developed method produces effective individualized, focused lead shields.
    • These focused shields offer improved control over radiation beam penumbra in teletherapy.
    • This advancement has the potential to enhance the precision and safety of radiation treatments.