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• W2943048329 abstract "To estimate in-air primary radiation output in a wide-beam multidetector computed tomography (CT) scanner.A 6-cc ionization chamber was placed free-in-air at the isocenter, and two sheets of lead (1-mm thickness) were placed on the bottom of the gantry cover, forming apertures of 40-80 mm in increments of 8 mm. The air-kerma rate profiles were measured with and without the apertures ( K˙w-A , K˙w/o-A ) for 4.8 s at tube potentials of 80, 100, 120, and 135 kVp, tube current of 50 mA, and rotation time of 0.4 s. The nominal beam width was varied from 40 to 160 mm in increments of 40 mm. Upon completion of data acquisition, the K˙w/o-A were plotted as a function of the measured beam width, and the extrapolated dose rates ( K˙0-w/o-A ) at zero beam width were calculated by second-order least-squares estimation. Similarly, the K˙w-A were plotted as a function of the radiation field (measured beam width × aperture size at the isocenter), and the extrapolated dose rates ( K˙0-w-A ) were compared with the K˙0-w/o-A .The means and standard errors of the K˙w/o-A with 40-, 80-, 120-, and 160-mm nominal beam widths at 120 kVp were 10.94 ± 0.01, 11.13 ± 0.01, 11.22 ± 0.01, and 11.31 ± 0.01 mGy/s, respectively, and the K˙0-w/o-A was reduced to 10.67 ± 0.02 mGy/s. The K˙0-w-A of 40-, 80-, 120-, and 160-mm beam widths were reduced to 10.6 ± 0.1, 10.6 ± 0.2, 10.5 ± 0.1, and 10.6 ± 0.1 mGy/s and were not significantly different from the K˙0-w/o-A .A method for describing the in-air primary radiation output in a wide-beam CT scanner was proposed that provides a means to characterize the scatter-to-primary ratio of the CT scanner." @default.
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• W2943048329 date "2019-05-02" @default.
• W2943048329 modified "2023-10-16" @default.
• W2943048329 title "Estimation of primary radiation output for wide‐beam computed tomography scanner" @default.
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• W2943048329 doi "https://doi.org/10.1002/acm2.12598" @default.
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