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Dose rate correction for a silicon diode detector array.

Andreas Jäger1, Sonja Wegener1, Otto A Sauer1

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Summary
This summary is machine-generated.

Dose rate dependence (DRD) in ArcCHECK detectors affects quality assurance measurements. This study quantifies corrections for average and instantaneous DRD, improving treatment plan accuracy and reducing falsely failed plans.

Keywords:
ArcCHECKQAVMATcorrectiondiodedose ratedosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Detector Technology

Background:

  • ArcCHECK detector signal is sensitive to dose rate due to recombination.
  • This dose rate dependence (DRD) impacts the accuracy of quality assurance measurements.

Purpose of the Study:

  • Quantify the signal dependence on dose rate for ArcCHECK detectors.
  • Develop and apply corrections to improve quality assurance measurements.

Main Methods:

  • Investigated average and instantaneous DRD using a linear accelerator and ArcCHECK array.
  • Compared measurements with an ion chamber reference.
  • Fitted exponential saturation functions to data for ArcCHECK detector types 2 and 3.
  • Applied corrections to volumetric modulated arc therapy plans.

Main Results:

  • Sensitivity decreased by up to 2.8% (average DRD) and 9% (instantaneous DRD).
  • Correcting instantaneous DRD improved gamma pass rates by 8.4 PP (type 3) and 0.9 PP (type 2).
  • Correcting average DRD improved gamma pass rates by 5 PP (type 3) and 0.4 PP (type 2).

Conclusions:

  • Instantaneous DRD is the primary factor affecting diode sensitivity.
  • A validated method for correcting instantaneous DRD was developed.
  • Corrections significantly reduce the number of falsely failed treatment plans.