Fig. 5From: Emphysema quantification using chest CT: influence of radiation dose reduction and reconstruction techniqueNoise (a and b) and CNR (c) measured at different dose levels with FBP, HIR and MIR. Noise was measured in the aorta (a) and subcutaneous fat (b). The dotted line represents the reference (FBP at routine dose). CNR contrast-to-noise ratio, FBP filtered back projection, HIR hybrid iterative reconstruction, MIR model-based iterative reconstructionBack to article page