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• W2891029166 abstract "To evaluate the ability of a model-based iterative reconstruction (MBIR) for improving image quality in upper abdominal CT with quarter of the normal dose, in comparison with adaptive statistical iterative reconstruction (ASiR) at normal dose.40 upper abdominal patients were randomly divided into two groups: normal-dose group (n = 20) with tube current modulation for noise index (NI) of 10 HU and 40% ASiR reconstruction; low-dose group (n = 20) with NI = 20 HU in the delay phase and MBIR and 40%ASiR. Images in the delay phase were compared. The CT values and standard deviation (SD) values of the liver, spleen, pancreas, kidney, erector spine and fat were measured. Contrast-noise-ratio (CNR = (CTtissue-CT fat)/SDfat) of each measured organ were calculated and compared with one-way ANOVA among the three reconstruction groups. The subjective image scores of the three groups were assessed blindly by two experienced physicians using a 5-point system and the score consistency was compared by the κ test.Dose reduction of 75 % was achieved for the low-dose scan. The subjective scores (95 % confidence intervals) of the three groups (NI 10-40 % ASiR, NI 20-40% ASiR and NI 20-MBIR) were 4.00 ± 0.79 (3.62-4.37), 3.35 ± 0.58 (3.07-3.62) and 3.90 ± 0.64 (3.60-4.19), respectively with no difference between the NI 10-40% ASiR and NI20-MBIR groups and good consistency between reviewers (κ = 0.726). MBIR had statistically lower SD values and higher contrast-to-noise ratio values in the liver, spleen, pancreas, kidney and erector spine than NI 10-40% ASiR and NI 20-40% ASiR (all p < 0.05).At 75 % dose reduction, MBIR provides similar image quality compared to 40% ASiR at normal-dose.MBIR provides good image quality at 25 % of the normal dose." @default.
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• W2891029166 date "2018-09-21" @default.
• W2891029166 modified "2023-09-27" @default.
• W2891029166 title "Improving image quality with model-based iterative reconstruction at quarter of nominal dose in upper abdominal CT" @default.
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• W2891029166 doi "https://doi.org/10.1259/bjr.20180137" @default.
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