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KMID : 0357520230460030231
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Journal of Radiological Science and Technology
2023 Volume.46 No. 3 p.231 ~ p.238
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A Comparison of Patient-specific Delivery Quality Assurance (DQA) Devices in Radiation Therapy
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Chang Kyung-Hwan
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Abstract
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This study aimed to compare the results of delivery quality assurance (DQA) using MapCHECK and OCTAVIUS for radiation therapy. Thirty patients who passed the DQA results were retrospectively included in this study. The point dose difference (DD) and gamma passing rate (GPR) were analyzed to evaluate the agreement between the measured and planned data for all cases, Plan complexity was evaluated to analyze dosimetric accuracy by quantifying the degree of modulation according to each plan. We analyzed the monitor units (MUs) and total MUs for each plan to evaluate the correlation between the MUs and plan complexity. We used a paired t-test to compare the DD and GPRs that were obtained using the two devices. The DDs and GPRs were within the tolerance range for all cases. The average GPRs difference between the two devices was statistically significant for the brain, and head and neck for gamma criteria of 3%/3 mm and 2%/2 mm. There was no significant correlation between the modulation index and total MUs for any of the cases. These DQA devices can be used interchangeably for routine patient-specific QA in radiation therapy.
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KEYWORD
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Delivery Quality Assurance, MapCHECK, OCTAVIUS, Modulation Index, Radiation Therapy
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