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Noise and contrast-to-noise ratio (CNR) are plotted as a function to exposure and reconstruction type. The noise is measured from the substrate in the CTP515 low contrast module. The noise is quantified as the standard deviation of a selection of voxels in Hounsfield units. CNR is calculated using Equation 1. The contrasting regions of interest are in the 1% elements of CTP515 and the adjacent substrate.
