Fig. 3From: A method to assess image quality for Low-dose PET: analysis of SNR, CNR, bias and image noisePlot of CNR at different count levels. a CNR at the full count range, (b) CNR at counts fewer than 20 × 106, (c) normalized CNR (CNR normalized by the value at full count level) at the full count range and the fitted function, (d) normalized CNR at counts fewer than 20 × 106 and the fitted functionBack to article page