Table 2 CT dosing measurements and image quality for the initial “low-dose” and suggested “ultra-low dose” CT protocols according to body weight
CT protocol | ||||
|---|---|---|---|---|
Initial “low dose” | Suggested “ultra-low dose” | |||
Body weight | ||||
< 80 kg | ≥ 80 kg | < 80 kg | ≥ 80 kg | |
CT dose | ||||
CTDIvol (mGy) | 1.6 ± 0.4 | 1.6 ± 0.4 | 1.1 ± 0.3 | 1.1 ± 0.3 |
DLP (mGy cm) | 60.9 ± 9.5 | 60.9 ± 9.5 | 42.2 ± 7.9 | 42.2 ± 7.9 |
Mean effective dose (mSv/mGy cm) | 0.85 | 0.85 | 0.59 | 0.59 |
Absolute cancer risk | 0.03 × 10-4 | 0.03 × 10-4 | 0.02 × 10-4 | 0.02 × 10-4 |
Image quality | ||||
Objective image noise (SD) | 39.1–44.4 | 48.3–54.1 | 59.5–61 | 65.9–73.8 |
Signal-to-noise ratio (SNR) | 21.2–24.4 | 17.5–19.8 | 15.3–16.1 | 12.8–14.5 |