Fig. 4From: Optimization of pulmonary emphysema quantification on CT scans of COPD patients using hybrid iterative and post processing techniques: correlation with pulmonary function testsBoxplot of %LAA-950 for the various iDose4 levels of ISP6 and ISP7 with and without denoising (n = 22, one patient had missing values). %LAA-950 percentage of lung voxels with attenuation < − 950 Hounsfield units, ISP IntelliSpace PortalBack to article page