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• W2244685763 abstract "While the assessment of CT noise constitutes an important task for the optimization of scan protocols in clinical routine, the majority of noise measurements in practice still rely on manual operation, hence limiting their efficiency and reliability. This study presents an algorithm for the automated measurement of CT noise in patient images with a novel structure coherence feature. The proposed algorithm consists of a four-step procedure including subcutaneous fat tissue selection, the calculation of structure coherence feature, the determination of homogeneous ROIs, and the estimation of the average noise level. In an evaluation with 94 CT scans (16 517 images) of pediatric and adult patients along with the participation of two radiologists, ROIs were placed on a homogeneous fat region at 99.46% accuracy, and the agreement of the automated noise measurements with the radiologists' reference noise measurements (PCC = 0.86) was substantially higher than the within and between-rater agreements of noise measurements (PCCwithin = 0.75, PCCbetween = 0.70). In addition, the absolute noise level measurements matched closely the theoretical noise levels generated by a reduced-dose simulation technique. Our proposed algorithm has the potential to be used for examining the appropriateness of radiation dose and the image quality of CT protocols for research purposes as well as clinical routine." @default.
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• W2244685763 date "2015-11-12" @default.
• W2244685763 modified "2023-09-25" @default.
• W2244685763 title "Automated measurement of CT noise in patient images with a novel structure coherence feature" @default.
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• W2244685763 doi "https://doi.org/10.1088/0031-9155/60/23/9107" @default.
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