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Related Experiment Videos

Portal dose measurements by a 2D array.

S Cilla1, L Grimaldi, G D'Onofrio

  • 1U.O. di Fisica Sanitaria, Università Cattolica S. Cuore, Campobasso, Italy.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|June 15, 2007
PubMed
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This study validates a 2D array detector for in vivo portal dose measurements in head and neck cancer radiotherapy. The detector accurately verifies treatment planning system predictions, aiding in dose delivery quality control during patient weight loss.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Quality Assurance

Background:

  • Accurate dose verification is crucial in radiotherapy, especially for head and neck tumors where patient weight loss can alter delivered doses.
  • In vivo dosimetry provides real-time feedback on dose delivery accuracy during treatment fractions.

Purpose of the Study:

  • To calibrate and evaluate a 2D array detector for in vivo comparison of measured and predicted portal doses in head and neck radiotherapy.
  • To establish acceptance criteria for comparing treatment planning system (TPS) predicted portal doses with 2D ion chamber measurements.

Main Methods:

  • A PTW 2D array with 729 vented plane parallel ion chambers was used for in vivo portal dose measurements.
  • Portal doses were measured and compared to predictions from a commercial TPS for seven head and neck cancer patients.

Related Experiment Videos

  • Gamma index analysis was employed to assess agreement between measured and predicted doses, using criteria of 5% dose difference and 4mm distance agreement.

    • Main Results:

    • The PTW 2D array demonstrated agreement >95% (P(gamma)>95%) with TPS predictions within the defined acceptance criteria.
    • One patient showed decreased agreement after three weeks due to significant weight loss, highlighting the detector's sensitivity to anatomical changes.
    • The 2D array proved to be a stable, efficient dosimeter for in vivo verification and time-efficient for IMRT quality control.

    Conclusions:

    • The PTW 2D array is a valuable tool for in vivo portal dose verification in head and neck radiotherapy, offering accurate quality control.
    • The study provides acceptance criteria for TPS-predicted portal dose image comparisons with in vivo measurements.
    • Portal dose measurements can identify the need for treatment replanning during the course of radiotherapy.