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• W2810144259 abstract "Knowledge of the effective energy of 320-multidetector computed tomography (CT) is important for quality assurance and quality control. Evaluation in two dimensions is necessary because the effective energy varies depending on the shape of the wedge filter located in the CT device. The purpose of this study was to measure the two-dimensional effective energy distribution of the CT using GAFCHROMIC EBT3 (EBT3), which has a weak energy dependence. The exposure parameters of the 320-multidetector CT were 120 kV, 500 mA, and 5.0 s, and the X-ray tube was stopped at the 0 o’clock position. To avoid scattered radiation, the distance between the EBT3 and other scatterers was set to 200 mm or more. The Al filter thickness was increased from 2 to 20 mm. The irradiated area was divided into 54 compartments, and the density attenuation ratio was measured. The half-value layers (HVLs) were determined using the density attenuation ratios. The effective energies were obtained from the HVLs, and the two-dimensional effective energy distribution was evaluated. Because the thickness of the wedge filter in the longitudinal direction (parallel to the bed) remained unchanged, the variation in the effective energy was negligible in this direction. On the other hand, in the lateral direction (perpendicular to the bed), because the wedge filter gradually thickened from the center to the side, the effective energy from the center to the side increased. The two-dimensional effective energy distribution of the CT could thus be measured using EBT3." @default.
• W2810144259 created "2018-07-10" @default.
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• W2810144259 date "2018-05-30" @default.
• W2810144259 modified "2023-09-27" @default.
• W2810144259 title "Evaluation of Effective Energy Distribution of 320-Multidetector CT Using GAFCHROMIC EBT3" @default.
• W2810144259 cites W1659720364 @default.
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• W2810144259 doi "https://doi.org/10.1007/978-981-10-9023-3_94" @default.
• W2810144259 hasPublicationYear "2018" @default.
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