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- W2465733044 abstract "Purpose:To develop an automated method to calculate a linear accelerator (LINAC) photon radiation field size, flatness, symmetry, output and beam quality in a single delivery for flattened (FF) and flattening-filter-free (FFF) beams using an ionization chamber array.Methods:The proposed method consists of three control points that deliver 30×30, 10×10 and 5×5cm2 fields (FF or FFF) in a step-and-shoot sequence where the number of monitor units is weighted for each field size. The IC Profiler (Sun Nuclear Inc.) with 5mm detector spacing was used for this study. The corrected counts (CCs) were calculated and the locations of the maxima and minima values of the first-order gradient determined data of each sub field. Then, all CCs for each field size are summed in order to obtain the final profiles. For each profile, the radiation field size, symmetry, flatness, output factor and beam quality were calculated. For field size calculation, a parameterized gradient method was used. For method validation, profiles were collected in the detector array both, individually and as part of the step-and-shoot plan, with 9.9cm buildup for FF and FFF beams at 90cm source-to-surface distance. The same data were collected with the device (plus buildup) placed on a movable platform to achieve a 1mm resolution.Results:The differences between the dosimetric quantities calculated from both deliveries, individually and step-and-shoot, were within 0.31±0.20% and 0.04±0.02mm. The differences between the calculated field sizes with 5mm and 1mm resolution were ±0.1mm.Conclusion:The proposed single delivery method proved to be simple and efficient in automating the photon dosimetric monthly and annual quality assurance." @default.
- W2465733044 created "2016-07-22" @default.
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- W2465733044 date "2016-06-01" @default.
- W2465733044 modified "2023-09-27" @default.
- W2465733044 title "SU-G-BRB-05: Automation of the Photon Dosimetric Quality Assurance Program of a Linear Accelerator" @default.
- W2465733044 doi "https://doi.org/10.1118/1.4956912" @default.
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