Additional file 1: of Emphysema quantification using chest CT: influence of radiation dose reduction and reconstruction technique

Table S1. Effect of different HU thresholds on emphysema quantification. Values represent the median [interquartile range] percentage emphysema at each dose level with FBP, HIR and MIR. FBP filtered back projection, HIR hybrid iterative reconstruction; MIR model-based iterative reconstruction, NA not applicable. Table S2. Effect of different percentiles on emphysema quantification. Values represent the median [interquartile range] HU value at each dose level with FBP. FBP filtered back projection; NA not applicable. Table S3. Effect of different percentiles on emphysema quantification. Values represent the median [interquartile range] HU value at each dose level with HIR. HIR hybrid iterative reconstruction; NA not applicable. Table S4. Effect of different percentiles on emphysema quantification. Values represent the median [interquartile range] HU value at each dose level with MIR. MIR model-based iterative reconstruction. (DOCX 35 kb)