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• W2007295963 abstract "Our purpose in this study was to evaluate the fundamental image quality characteristics of a new slot‐scan digital chest radiography system (ThoraScan, Delft Imaging Systems/Nucletron, Veenendaal, The Netherlands). The linearity of the system was measured over a wide exposure range at 90, 117, and 140 kVp with added Al filtration. System uniformity and reproducibility were established with an analysis of images from repeated exposures. The modulation transfer function (MTF) was evaluated using an established edge method. The noise power spectrum (NPS) and the detective quantum efficiency (DQE) of the system were evaluated at the three kilo‐voltages over a range of exposures. Scatter fraction (SF) measurements were made using a posterior beam stop method and a geometrical chest phantom. The system demonstrated excellent linearity, but some structured nonuniformities. The 0.1 MTF values occurred between The DQE(0.15) and DQE(2.5) were 0.21 and 0.07 at 90 kVp, 0.18 and 0.05 at 117 kVp, and 0.16 and 0.03 at 140 kVp, respectively. The system exhibited remarkably lower SFs compared to conventional full‐field systems with anti‐scatter grid, measuring 0.13 in the lungs and 0.43 in the mediastinum. The findings indicated that the slot‐scan design provides marked scatter reduction leading to high effective DQE of the system and reduced patient dose required to achieve high image quality." @default.
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• W2007295963 date "2004-08-27" @default.
• W2007295963 modified "2023-09-25" @default.
• W2007295963 title "Fundamental imaging characteristics of a slot-scan digital chest radiographic system" @default.
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• W2007295963 doi "https://doi.org/10.1118/1.1783531" @default.
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