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Related Experiment Videos

A comparison of surface doses for two immobilizing systems

M W Johnson1, M A Griggs, S C Sharma

  • 1Department of Radiation Oncology, E. W. Sparrow Hospital, Lansing, MI 48909.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|January 1, 1995
PubMed
Summary

Alpha Cradle and VacFix immobilizing systems improve treatment repositioning. CT scans revealed density variations, impacting radiation dose delivery and patient surface dose, crucial for radiotherapy accuracy.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Radiation Oncology

Background:

  • Accurate patient positioning is vital for reproducible radiotherapy treatments.
  • Immobilization devices like Alpha Cradle and VacFix conform to patients, enhancing daily setup consistency.
  • Potential beam modification by these systems can alter target dose and increase surface dose.

Purpose of the Study:

  • To evaluate the dosimetric impact of Alpha Cradle and VacFix immobilization systems.
  • To compare the relative densities of these systems using CT scans.
  • To assess the effect on patient surface dose from different radiation sources.

Main Methods:

  • CT scans were performed on Alpha Cradle and VacFix systems.
  • Relative densities were calculated and compared to air.

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  • Surface dose measurements were taken using Cobalt-60 and dual photon linear accelerator beams.

    • Main Results:

    • CT scans provided relative density data for both immobilization systems.
    • Calculated densities indicate potential for radiation beam modification.
    • Surface dose data highlights variations depending on the immobilization system and radiation source.

    Conclusions:

    • Immobilization systems can influence radiation dose distribution.
    • Understanding material densities is key to predicting dosimetric effects.
    • Further investigation is needed to optimize immobilization techniques for accurate radiotherapy delivery.