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A comparative study of dosimetric verification of HalcyonTM treatment plans using Varian Portal Dosimetry and PTW array 1500 / 中华放射医学与防护杂志
Chinese Journal of Radiological Medicine and Protection ; (12): 58-62, 2019.
Article in Chinese | WPRIM | ID: wpr-734316
ABSTRACT
Objective To compare two pretreatment plan QA methods for HalcyonTM accelerator using Portal Dosimetry (PD),and PTW OCTAVIUS 1500 detector array + Octagonal phantom (Oct 1500)respectively.Methods Parallel measurement-based pretreatment QA using two methods was performed for 22 IMRT/VMAT plans (74 fields) that have been used to treat 20 patients recruited in the Halcyon clinical trial.Several γ 2D comparisons were also applied to provide guidelines for Halcyon planning QA.Results Using Oct1500 method,the γ 2D passing rates for 74 fields in 22 Plans were 95.26±3.59,95.01±3.62 (Local Dose),99.05± 1.35,98.57± 1.96 (Max Dose) respectively.Two-related samples non-parametric tests suggested that the differences between the evaluation criteria were of statistical significance (Z =-7.220,-4.108,P<0.05).For PD method,the γ 2D passing rates were 84.11% ± 1.35% (1 mm/1%),99.07%± 1.35% (2 mm/2%),and 99.86% ± 1.35% (3 mm/3%).Two-related samples non-parametric tests suggested that the differences between evaluation criteria of PD method were statistically significant (Z =-7.475,-7.475,-6.906,P<0.05).For 74 fields and max dose,3 mm/3% evaluation criteria,two-related samples non-parametric tests suggested that the differences between PD and Oct1500 method were statistically significant (Z=-5.072,P<0.05).Conclusions Both methods can be used for Halcyon pretreatment plan QA.PD is superior to Oct1500 with respect to efficiency and spatial resolution-induced verification accuracy.The criteria of 2 mm/2% for PD,and Max Dose/3 mm/3% for Oct1500 was suggested.

Full text: Available Index: WPRIM (Western Pacific) Type of study: Practice guideline Language: Chinese Journal: Chinese Journal of Radiological Medicine and Protection Year: 2019 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Type of study: Practice guideline Language: Chinese Journal: Chinese Journal of Radiological Medicine and Protection Year: 2019 Type: Article