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Implementation and validation of 2-D-array based tests in routine linac quality assurance.

Jiří Valenta1, Manfred Schmidt1, Christoph Bert1

  • 1Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Universitätsstraße 27, 91054 Erlangen, Germany; Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN), Östliche Stadtmauerstraße 30, 91054 Erlangen, Germany.

Zeitschrift Fur Medizinische Physik
|February 17, 2024
PubMed
Summary

A low-resolution 2-D ionization chamber array effectively replaces film dosimetry in medical linear accelerator (linac) quality assurance (QA). This method maintains high test sensitivity and offers significant QA time savings.

Keywords:
2-D arrayLinear accelerator quality assuranceTest sensitivityTest specificity

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Traditional film dosimetry in medical linear accelerator (linac) quality assurance (QA) is being replaced by electronic methods.
  • Low-resolution 2-D ionization chamber arrays offer a potential alternative for enhanced efficiency and accuracy.

Purpose of the Study:

  • To evaluate the feasibility of replacing film dosimetry with 2-D ionization chamber array measurements in linac QA.
  • To validate these new procedures and conduct a thorough sensitivity analysis.

Main Methods:

  • A 2-D ionization chamber array (7.62 mm resolution) was used for junction, MLC transmission, and beam profile/energy constancy tests.
  • Test validation and sensitivity analyses were performed using short- and long-term statistical data.

Main Results:

  • All mechanical and dosimetry tests were successfully executed using the 2-D array.
  • Sensitivities of 99.0% or higher and specificities of 99.5%–99.9% were achieved, meeting AAPM TG-142 recommendations.

Conclusions:

  • A low-resolution 2-D ionization chamber array can replace film dosimetry in linac QA without compromising test sensitivity.
  • Implementing this technology in routine QA programs can lead to substantial time savings.