Comparison of Portal Dosimetry System (PDs) and ArcCHECK Phantom by HALCYON of Patient Treatment Plans in Radiation Techniques VMAT QA Systems
Keywords:
VMAT, HALCYON, treatment plan verification systemAbstract
Background and Objective: Volumetric modulated arc therapy (VMAT) is a complex radiation technique. Therefore, the radiation dose should be checked before starting treatment. Verification of the treatment plan is an important step for validation. to ensure that the radiation received by the patient is according to the treatment plan. Therefore, a comparative study was conducted on the verification of VMAT treatment plans by HALCYON using the portal dosimetry system (PDs) and the ArcCHECK radiation measuring instrument.
Methods: The VMAT treatment plan for head and neck cancer patients of Maharat Nakhon Ratchasima Hospital during October 2021 to March 2022 (n = 77) were irradiated with HALCYON onto electronic portal imaging devices (EPIDs) and ArcCHECK compared the radiation dose from the planar radiation measurement with the radiation dose from the treatment plan. Analyzed by gamma criteria at 3%/3 mm, 3%/2 mm and 2%/2 mm..
Results: Verification of PDs and ArcCHECK treatment plans, all gamma criteria divided into 3%/3 mm., 3%/2 mm., and 2%/2 mm. equal to 99.9±0.1%(PDs) 97.2±4.9%(ArcCHECK ),99.7±0.3%(PDs) 94.6 ± 7.4% (ArcCHECK), and 98.9 ± 1%(PDs) 90.9 ± 9.6%(ArcCHECK), respectively, with a statistically significant difference (p < 0.05) and when classified according to the number of arcs and isocenters, it was found that most were able to pass the criteria for both systems. However, the VMAT treatment plan, 3arcs 1isocenter format for ArcCHECK, found that the gamma passing rate was slightly lower than the criteria.
Conclusion: Both treatment plan verification systems, when verifying the overall varian HALCYON machine radiation treatment plan, passed the gamma criteria, with PDs passing the criteria better than ArcCHECK.
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