Fig. 1. Images of 43-year-old woman with metastatic lung nodule from rectal cancer show round pulmonary nodule measuring 5 mm (arrows) in left basal lung. ASIR-driven ultra-low-dose CT (A), FBP-driven ultra-low-dose CT (B), and standard dose CT (C) images. All observers detected nodule on ASIR- and FBP-driven ultra-low-dose CT and on standard dose CT. Using ultra-low-dose CT, ASIR provides more acceptable image noise, better diagnostic acceptability, and visual sharpness of pulmonary nodule than FBP. ASIR = adaptive statistical iterative reconstruction, FBP = filtered back projection Fig. 1. Images of 43-year-old woman with metastatic lung nodule from rectal cancer show round pulmonary nodule measuring 5 mm (arrows) in left basal lung. ASIR-driven ultra-low-dose CT (A), FBP-driven ultra-low-dose CT (B), and standard dose CT (C) images. All observers detected nodule on ASIR- and FBP-driven ultra-low-dose CT and on standard dose CT. Using . . . Korean J Radiol. 2015 Sep-Oct;16(5):1132-1141. http://dx.doi.org/10.3348/kjr.2015.16.5.1132