Table 1.

Comparison of lesion conspicuity between filtered back projections and iterative reconstructions

	Standard-dose CT with FBP	Low-dose CT with FBP	Low-dose CT with ASIR	Low-dose CT with MBIR
Consolidation or mass	4.9 ± 0.2	4.7 ± 0.6	4.8 ± 0.4	4.9 ± 0.2
Ground-glass attenuation	5.0 ± 0.2	4.8 ± 0.4	4.8 ± 0.4	4.8 ± 0.4
Reticular opacity	5.0 ± 0	4.9 ± 0.4	5.0 ± 0	5.0 ± 0
Decreased lung attenuation (bulla, emphysema, or cyst)	4.9 ± 0.2	4.5 ± 0.6 *§	4.6 ± 0.5 *§	4.9 ± 0.2
Mediastinal lymph node enlargement	4.8 ± 0.4	3.0 ± 0.5 *§	4.0 ± 0.5 *§	4.7 ± 0.5

CT Computed tomography, FBP Filtered back projection, ASIR Adaptive statistical iterative reconstruction, MBIR Model-based iterative reconstruction.

The comparisons of lesion conspicuity scores were made by the Wilcoxon signed-rank test. * refers to statistically significant differences with standard-dose FBP CT (* p < 0.05). ^§ refers to statistically significant differences with low-dose MBIR CT (^§ p < 0.05).