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Related Experiment Video

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Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement
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Dosimetric intercomparison for multicenter clinical trials using a patient-based anatomic pelvic phantom.

M A Ebert1, K M Harrison, S J Howlett

  • 1Department of Radiation Oncology, Sir Charles Gairdner Hospital, Western Australia 6009, Australia. Martin.Ebert@health.wa.gov.au

Medical Physics
|October 8, 2011
PubMed
Summary

This study used a realistic pelvic phantom to verify radiotherapy dose delivery accuracy in rectal and prostate cancer treatments across multiple centers. Results show generally accurate dosing, but highlight potential overdosing near the sacrum and underdosing at the prostate-rectal border.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Clinical Dosimetry

Background:

  • Accurate dose delivery is crucial in pelvic radiotherapy for effective cancer treatment and minimizing side effects.
  • Variability in radiotherapy practices across centers can impact treatment outcomes.
  • Realistic patient geometries are essential for accurate dose verification.

Purpose of the Study:

  • To evaluate the accuracy of radiation dose delivery to critical points in realistic pelvic anatomy for rectal and prostate cancer radiotherapy.
  • To assess dose delivery consistency across multiple radiotherapy centers using a standardized phantom.
  • To identify potential discrepancies between planned and delivered doses in clinical scenarios.

Main Methods:

  • A heterogeneous pelvic phantom simulating realistic anatomy was used.
  • The phantom underwent treatment at 36 radiotherapy centers in Australia and New Zealand, following established trial protocols.
  • Point dose measurements were performed using thermoluminescent dosimeters (TLDs) and an ionization chamber, with comprehensive data collection.

Main Results:

  • Rectal treatment: Dose to the prescription point was consistent with planned dose (-0.1% ± 0.3%). However, doses in the sacral hollow region were higher than planned (+1.2% ± 0.2%).
  • Prostate treatment: Dose delivery to the prostate volume was accurate (-0.49% ± 0.2%), but the planning target volume (PTV) at the prostate-rectal border tended to be underdosed.
  • Out-of-field doses were measured to be significantly higher than planned.

Conclusions:

  • A realistic, heterogeneous phantom is effective for comprehensively assessing radiotherapy dose delivery across various treatment parameters.
  • The phantom facilitated verification of dose delivery for two distinct clinical trials, demonstrating its utility and efficiency.
  • Findings highlight the need for careful monitoring of dose delivery, particularly in specific anatomical regions and for out-of-field doses.