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Related Experiment Videos

Photon contamination in 8-20-MeV electron beams from a linear accelerator.

D Gur, A G Bukovitz, C Serago

    Medical Physics
    |March 1, 1979
    PubMed
    Summary

    Direct measurements reveal significant X-ray contamination in electron beams, potentially overestimating superficial dose. This photon contamination, measured using a magnetic field, impacts radiation therapy planning.

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    Obesity and extent of emphysema depicted at CT.

    Clinical radiology·2015

    Area of Science:

    • Medical Physics
    • Radiation Oncology

    Background:

    • Electron beams in radiation therapy can carry photon contamination.
    • Conventional methods may underestimate the dose contribution of this contamination to superficial tissues.

    Purpose of the Study:

    • To directly measure X-ray contamination near the surface of a phantom irradiated with electron beams.
    • To determine if photon contamination contributes a higher superficial dose than conventionally indicated.

    Main Methods:

    • Used a magnetic field to deflect electron beams from a linear accelerator.
    • Studied electron energies ranging from 8 to 20 MeV.
    • Measured photon contamination characteristics directly in a water tank.

    Main Results:

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  • Significant photon contamination was detected in all tested electron beam energies.
  • Measured photon contamination qualities matched theoretical bremsstrahlung spectra.
  • This suggests a potential for increased superficial dose not accounted for by standard dosimetry.

    • Conclusions:

    • Direct measurement confirms substantial X-ray contamination in clinical electron beams.
    • This contamination may lead to an overestimation of superficial dose in radiation therapy.
    • Findings necessitate re-evaluation of dosimetry protocols for electron beam treatments.