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- W2004933762 abstract "In this study, we systematically investigated the noise correlation properties among detector bins of CBCT projectiondata by analyzing repeated projection measurements. The measurements were performed on a TrueBeam on-boardCBCT imaging system with a 4030CB flat panel detector. An anthropomorphic male pelvis phantom was used to acquire500 repeated projection data at six different dose levels from 0.1 mAs to 1.6 mAs per projection at three fixed angles. Tominimize the influence of the lag effect, lag correction was performed on the consecutively acquired projection data. Thenoise correlation coefficient between detector bin pairs was calculated from the corrected projection data. The noisecorrelation among CBCT projection data was then incorporated into the covariance matrix of the penalized weightedleast-squares (PWLS) criterion for noise reduction of low-dose CBCT. The analyses of the repeated measurements showthat noise correlation coefficients are non-zero between the nearest neighboring bins of CBCT projection data. Theaverage noise correlation coefficients for the first- and second- order neighbors are 0.20 and 0.06, respectively. The noisecorrelation coefficients are independent of the dose level. Reconstruction of the pelvis phantom shows that the PWLScriterion with consideration of noise correlation results in a lower noise level as compared to the PWLS criterion withoutconsidering the noise correlation at the matched resolution." @default.
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- W2004933762 date "2014-03-19" @default.
- W2004933762 modified "2023-09-27" @default.
- W2004933762 title "An experimental study on the noise correlation properties of CBCT projection data" @default.
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- W2004933762 doi "https://doi.org/10.1117/12.2043151" @default.
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