Signal-to-Noise Results for CT Images of Water Phantoms
| Phantom diameter (mm) | ||||||
| Voltage (kV) | Current (mA) | Reference phantom* | 270 | 200 | 160 | 100 |
| 140 | 2.5 | 42 (35–52) | 27 (23–34) | 18 (15–21) | 11 (9–14) | |
| 140 | 2.0 | 30 (27–35) | 21 (22–25) | 12 (10–15) | ||
| 140 | 1.5 | 35 (26–45) | 25 (23–32) | 14 (12–16) | ||
| 140 | 1.0 | 43 (36–54) | 29 (28–33) | 16 (14–19) | ||
| 120 | 2.5 | 33 (27–43) | 22 (21–26) | 13 (11–16) | ||
| 120 | 2.0 | 37 (25–49) | 25 (24–31) | 15 (13–16) | ||
| 120 | 1.5 | 43 (37–52) | 29 (27–34) | 17 (15–19) | ||
| 120 | 1.0 | 53 (44–69) | 36 (33–42) | 20 (17–23) | 11 (10–12) | |
↵* Torso phantom (260 × 380 mm).
Data are SDs in Hounsfield units, followed by ranges in parentheses.