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.

Figure 2 Top row (A-D) and bottom (E-H) row of a 68-year-old female. A-D: Transverse abdominal CT images of a 68-year-old female (BMI 25 kg/m²) acquired at SD FBP (5 mGy) and RD (1.3 mGy) (reconstructed with B-1, B-2, and B-3). The gall bladder stones (arrows) were optimally depicted on SD FBP but missed on RD B-1, RD B-2, and RD B-3 images; E-H: Transverse abdominal CT images of a 71-year-old female (BMI 25 kg/m²) acquired at SD FBP (5 mGy) and RD (1.2 mGy) (reconstructed with B-1, B-2, and B-3). The liver parenchyma was optimally depicted on SD FBP, scored sufficiently on RD B-3, and limited on RD B-1 and RD B-2 images. SD: Standard of care; FBP: Filtered back projection; RD: Reduced dose; BMI: Body mass index; CT: Computed tomography.

Figure 3 Top row (A-D) and bottom row (E-H) of a 41-year-old female. A-D: Transverse abdominal CT images of a 41-year-old female (BMI 38 kg/m²) acquired at SD FBP (16 mGy) and RD (1.3 mGy) (reconstructed with C-1, C-2, and C-3). The gall bladder stone (arrows) was optimally depicted on SD FBP. However, gall bladder stone was missed on RD C-1, RD C-2, and RD C-3 images; E-H: Transverse abdominal CT images of a 29-year-old male (BMI 18 kg/m²) acquired at SD FBP (6 mGy) and RD (1.4 mGy) (reconstructed with C-1, C-2, and C-3). The liver parenchyma was optimally depicted on SD FBP, scored sufficiently on RD C-3, and limited on RD C-1 and RD C-2 images. SD: Standard of care; FBP: Filtered back projection; RD: Reduced dose; BMI: Body mass index; CT: Computed tomography.