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Se An Oh 1 Article
Clinical performance of FractionLab in patient-specific quality assurance for intensity-modulated radiotherapy: a retrospective study
Se An Oh, Sung Yeop Kim, Jaehyeon Park, Jae Won Park, Ji Woon Yea
Yeungnam Univ J Med. 2022;39(2):108-115.   Published online September 9, 2021
DOI: https://doi.org/10.12701/yujm.2021.01123
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AbstractAbstract PDF
Background
This study was aimed at comparing and analyzing the results of FractionLab (Varian/Mobius Medical System) with those of portal dosimetry that uses an electronic portal imaging device. Portal dosimetry is extensively used for patient-specific quality assurance (QA) in intensity-modulated radiotherapy (IMRT).
Methods
The study includes 29 patients who underwent IMRT on a Novalis-Tx linear accelerator (Varian Medical System and BrainLAB) between June 2019 and March 2021. We analyzed the multileaf collimator (MLC) DynaLog files generated after portal dosimetry to evaluate the same condition using FractionLab. The results of the recently launched FractionLab at various gamma indices (0.1%/0.1 mm–1%/1 mm) are analyzed and compared with those of portal dosimetry (3%/3 mm).
Results
The average gamma passing rates of portal dosimetry (3%/3 mm) and FractionLab are 98.1 (95.5%–100%) and 97.5% (92.3%–99.7%) at 0.6%/0.6 mm, respectively. The results of portal dosimetry (3%/3 mm) are statistically comparable with the QA results of FractionLab (0.6%/0.6 mm–0.9%/0.9 mm).
Conclusion
This paper presents the clinical performance of FractionLab by the comparison of the QA results of FractionLab using portal dosimetry with various gamma indexes when performing patient-specific QA in IMRT treatment. Further, the appropriate gamma index when performing patient-specific QA with FractionLab is provided.

JYMS : Journal of Yeungnam Medical Science