CT images with a low-contrast resolution were presented by calculating differences in CT values, in which differences with 15, 10 and 5 HU between CT values indicated that1.5%, 1.0% and 0.5% of CT images had a low-contrast resolution, respectively.
The quantitative method of calculating contrast to noise ratio (CNR) took all the influence factors such as background material, targets and noise into consideration when used to evaluate low-contrast resolution. CNR for low-contrast resolution evaluation was calculated as follows [15]:
where CTB and CTI are the mean CT values in background ROI and insert ROI respectively, and SDB is the standard deviation in ROIB.
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