Assessment of sub-milli-sievert abdominal computed tomography with iterative reconstruction techniques of different vendors

Figure 1 Top row (A-D) and bottom row (E-H) of a 71-year-old male. A-D: Transverse abdominal CT images of a 71-year-old male (BMI 24 kg/m²) acquired at SD FBP (8 mGy) and RD (1.4 mGy) (reconstructed with A-1, A-2, and A-3). The left kidney stone (red arrows) was optimally depicted on SD FBP (A). However, left kidney stone was missed on RD A-1, RD A-2, and RD A-3 images (B-D). In addition, probably pseudo kidney stone (blue arrows) was seen on RD A-1, RD A-2, and RD A-3 images; E-H: Transverse abdominal CT images of a 3-year-old male (BMI 20 kg/m²) acquired at SD FBP (5 mGy) and RD (1.3 mGy) reconstructed with A-1, A-2, and A-3. The liver parenchyma was optimally depicted on SD FBP, scored sufficiently on RD A-2, and limited on RD A-1 and RD A-3 images. SD: Standard of care; FBP: Filtered back projection; RD: Reduced dose; BMI: Body mass index; CT: Computed tomography.