Performance evaluation of myQA Dailyfor output constancy check on linear accelerator

Authors

  • Sakda Kingkaew Division of Radiation Oncology, Department of Radiology, King Chulalongkorn University, Thai Red Cross Society
  • Noppin Sowanna Department of Radiological Technology and Medical Physics, Faculty of Allied Health Sciences, Chulalongkorn University
  • Panida Silprakob Department of Radiological Technology and Medical Physics, Faculty of Allied Health Sciences, Chulalongkorn University
  • Pattaravadee Promnguluem Department of Radiological Technology and Medical Physics, Faculty of Allied Health Sciences, Chulalongkorn University
  • Sornjarod Oonsiri Division of Radiation Oncology, Department of Radiology, King Chulalongkorn University, Thai Red Cross Society

Keywords:

Linear accelerator, myQA Daily, Quality assurance

Abstract

Background: The myQA Daily device is a daily quality control device for controlling machine-specific parameters, such as dose output, flatness, symmetry, center, field size, and energy. The myQA Daily device also contains temperature sensors and pressure sensors for measuring temperature and pressure.
Objective: To evaluate the performance of the myQA Daily device as a daily quality control device for a linear accelerator.
Materials and Methods: Performance evaluation was performed using Varian TrueBEAM linear accelerator at 6 MV photon beams and 9 MeV electron beams. The evaluating parameters consist of short-term reproducibility, linearity, temperature and pressure, dose rate and output constancy. Measurements of the machine using the myQA daily device were compared to ionization chamber, thermometer and barometer.
Results: The coefficient of variation for the myQA Daily short-term reproducibility was 0.05% and also showed a linear dose output response. On temperature and pressure test, the myQA Daily agreed with calibrated thermometer and barometer. The variation of dose rate was within 0.30%. Over the period, the myQA Daily output constancy agreed with the ionization chamber to within 1.30%.
Conclusion: The myQA Daily device is reliable as an ionization chamber for routine quality assurance of linear accelerator.

References

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IBA Dosimetry GmbH., Schwarzenbruch, Germany. myQA Daily User's Guide. 2019 [Retrieved July 31, 2020]. Available from: https://www.iba-dosimetry.com/product/myqa-daily/.

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Published

2021-08-13

How to Cite

1.
Kingkaew S, Sowanna N, Silprakob P, Promnguluem P, Oonsiri S. Performance evaluation of myQA Dailyfor output constancy check on linear accelerator. J Thai Assn of Radiat Oncol [Internet]. 2021 Aug. 13 [cited 2024 Nov. 15];27(2):R1-R12. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/248723

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Original articles