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Calibration of a detector array through beam profile reconstruction with error-locking.

Song Wang1, Zhiqiu Li, K S Clifford Chao

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Summary

A new iterative method accurately calibrates radiation detector sensitivities with fewer measurements and improved robustness against positioning errors compared to existing techniques. This method is suitable for various detector arrays, including electronic portal imaging devices.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Detector Calibration

Background:

  • Accurate calibration of radiation detector arrays is crucial for precise radiotherapy delivery.
  • Existing iterative calibration methods can be sensitive to positioning errors and require numerous measurements.

Purpose of the Study:

  • To develop and validate a novel iterative method for calibrating two-dimensional (2D) radiation detector array sensitivities.
  • To assess the robustness and efficiency of the proposed method against positioning errors and measurement requirements.

Main Methods:

  • An iterative approach was used to reconstruct 2D beam profiles from shifted irradiations.
  • An error-locking scheme was implemented to mitigate propagation errors from output variations and positioning inaccuracies.
  • The proposed method was compared against a commercial iterative method and a noniterative method using a MapCHECK2 detector array and a 6 MV photon beam.

Main Results:

  • The proposed iterative method required significantly fewer irradiations (9) compared to the noniterative method (29).
  • It demonstrated superior robustness against a 5 mm positioning error, yielding a 0.40% ± 0.36% deviation, compared to the commercial method's 3.58% ± 1.94% deviation.
  • Patient studies showed the proposed method maintained comparable dose to agreement passing rates, unlike the commercial method which decreased by 2.7% with positioning errors.

Conclusions:

  • The proposed iterative method provides accurate detector sensitivity calibration within 1% mean error.
  • It offers improved robustness against positioning errors and requires fewer measurements than traditional methods.
  • The method's applicability to inline detector arrays without rotation functions, such as EPID, is a significant advantage.