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A patient dose verification program using diode detectors

C Li1, L S Lamel, D Tom

  • 1Radiation Oncology Department, Marin General Hospital, Greenbrae, CA 94904, USA.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|January 1, 1995
PubMed
Summary
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This study details a patient dose verification program for external beam radiotherapy using a dual diode detector. Careful consideration of factors affecting diode sensitivity ensures accurate patient dosimetry, achieving a 90% acceptance rate.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Accurate patient dose verification is crucial in external photon beam radiotherapy.
  • Dual diode detector systems offer a method for patient dose verification.
  • Diode sensitivity can be influenced by various physical and environmental factors.

Purpose of the Study:

  • To establish a comprehensive patient dose verification program using a commercial dual diode detector.
  • To identify and evaluate factors affecting diode sensitivity in radiotherapy dosimetry.
  • To ensure acceptable accuracy in patient dose measurements.

Main Methods:

  • Utilized a commercial dual diode detector system for dose verification.
  • Investigated the impact of temperature, saturation, linearity, radiation damage, and beam incidence angle on diode sensitivity.

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  • Assessed the influence of wedge filters, block trays, field size variations, and measurement source-to-surface distances (SSDs).

    • Main Results:

    • Diode sensitivity is significantly affected by temperature, saturation, linearity, radiation damage, and beam incidence angle.
    • Wedge filters, close proximity of block trays, field size variations, and measurement SSDs also impact diode sensitivity.
    • A 5% dose deviation threshold was implemented for reevaluation, leading to a 90% acceptance rate in clinical cases.

    Conclusions:

    • A robust patient dose verification program requires careful consideration of factors influencing dual diode detector sensitivity.
    • Implementing a 5% dose deviation criterion ensures high accuracy and acceptance rates in clinical radiotherapy.
    • This program enhances the reliability of patient dosimetry in external photon beam radiotherapy.