Fig. 2.

Forty-three-year-old male with small hepatic cysts.

A. Image scanned with 120 kVp and reference mAs of 240 and reconstructed with FBP, resulting in effective dose 8.69 mSv. B, C and D. CT scan obtained 2 months later with CARE kV (i.e., 100 kVp) and 30% reduced reference mAs of 170, resulting in effective dose of 4.74 mSv (45.5% dose reduction) and reconstructed without application of SAFIRE (i.e., use of FBP); (B) and with SAFIRE strengths of 3 (C) and 5 (D). Image noise was 7 HU (A), 12 HU (B), 8.7 (C) and 4.8 (D), respectively. FBP = filtered back projection, SAFIRE = sinogram-affirmed iterative reconstruction, HU = Hounsfield Unit