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Related Experiment Videos

CT based lung density correction verification with in vivo dosimetry using diodes.

U Schneider1, J Besserer, C Erckes

  • 1Medizinische Physik, Klinik für Radio-Onkologie und Nuklearmedizin, Stadtspital Triemli, Zürich.

Zeitschrift Fur Medizinische Physik
|February 1, 2002
PubMed
Summary

Diode measurements of patient exit doses are precise for verifying radiation therapy treatment planning. This study confirms diode measurements can effectively identify systematic errors in dose calculations, ensuring treatment accuracy.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Dosimetry

Background:

  • In vivo dose measurements are crucial for verifying radiotherapy accuracy.
  • Diode dosimetry offers a practical method for patient dose assessment.
  • Accurate verification of treatment planning system (TPS) calculations, especially inhomogeneity corrections, is essential.

Purpose of the Study:

  • To determine the precision of diode measurements for verifying patient exit doses.
  • To assess the accuracy of the modified Batho Law inhomogeneity correction in the CadPlan TPS.
  • To evaluate the utility of exit dose measurements in identifying TPS calculation errors.

Main Methods:

  • Performed in vivo dose measurements using diodes in the thoracic region of 115 patients.

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  • Measured both entrance and exit doses to compare with TPS calculations.
  • Compared diode measurements with dose calculations from the CadPlan TPS, specifically evaluating inhomogeneity corrections.

    • Main Results:

    • Diode measurements demonstrated sufficient precision (< 0.5% of ICRU dose) for verifying TPS density corrections.
    • The mean deviation between measured and calculated exit doses was found to be zero within measurement error.
    • The study confirmed that exit dose measurements are highly effective in detecting systematic errors in dose calculations.

    Conclusions:

    • In vivo diode measurements of patient exit doses are precise enough for verifying inhomogeneity corrections in radiotherapy.
    • The modified Batho Law inhomogeneity correction in the CadPlan TPS demonstrated good agreement with measured data.
    • Exit dose measurements, even in a limited patient cohort, are a valuable tool for identifying systematic errors in radiotherapy dose calculations.