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Small field measurements with a novel silicon position sensitive diode array.

S Manolopoulos1, C Wojnecki, R Hugtenburg

  • 1Rutherford Appleton Laboratory, Science and Technology Facilities Council, Chilton OX110QX, UK.

Physics in Medicine and Biology
|January 7, 2009
PubMed
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A new dosimeter (DOSI) shows excellent agreement with diamond detectors for small radiotherapy field measurements. While showing discrepancies with ionization chambers at smaller field sizes, DOSI offers efficient real-time dosimetry for faster quality assurance.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Physics Instrumentation

Background:

  • Accurate dosimetry is critical in radiotherapy, especially for small fields.
  • Traditional dosimetry methods can be time-consuming for commissioning and quality assurance (QA).
  • Novel detectors are needed to improve efficiency and accuracy in clinical settings.

Purpose of the Study:

  • To evaluate the performance of DOSI, a novel position-sensitive detector dosimeter, for relative clinical dosimetry in small radiotherapy fields.
  • To compare DOSI measurements with established detectors like diamond detectors and ionization chambers.
  • To assess the potential of DOSI for real-time, high-resolution dosimetry in stereotactic radiotherapy.

Main Methods:

  • DOSI was used for relative dosimetry measurements in small radiotherapy fields (6 MV photons).

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  • Measurements included basic beam data: relative output factors (ROF), percentage depth doses (PDD), and off-axis ratios (OAR).
  • Data acquired with DOSI were compared against measurements from a small diamond detector and a PinPoint ionization chamber.

    • Main Results:

    • DOSI demonstrated excellent agreement with the diamond detector across all measurements.
    • Discrepancies were observed between DOSI and ionization chamber measurements for ROF in fields smaller than 15 mm.
    • PDD agreement was within 1%, OAR within 3%, and ROF within 1% for most comparisons.
    • All measurements were completed rapidly (within 45 min), highlighting DOSI's efficiency.

    Conclusions:

    • DOSI is a viable tool for relative clinical dosimetry in small radiotherapy fields, offering high spatial resolution and real-time capabilities.
    • Its performance is comparable to diamond detectors, though differences with ionization chambers warrant further investigation for small fields.
    • The rapid measurement capability of DOSI can significantly reduce time for radiotherapy commissioning and QA.