Table 2.
Reference mAs, delivered mAs, CTDIvol and DLP for each phantom and tube voltage
| Phantom | Lungman | Lungman plus fat | Esser | NEMA IQ | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CARE kV status | Semi (fixed kV) | Semi (fixed kV) | Semi (fixed kV) | Semi (fixed kV) | ||||||||||||
| Tube voltage (kV) | 80 | 100* | 120 (ref) | 140 | 80 | 100 | 120 (ref)* | 140 | 80 | 100* | 120 (ref) | 140 | 80 | 100* | 120 (ref) | 140 |
| Reference mAs (eff) | 247 | 84 | 50 | 35 | 247 | 84 | 50 | 35 | 247 | 84 | 50 | 35 | 247 | 84 | 50 | 35 |
| Delivered mean mAs (eff) | 145 | 45 | 27 | 20 | 275 | 84 | 46 | 32 | 68 | 26 | 17 | 13 | 115 | 41 | 25 | 19 |
| CTDIvol (mGy)a | 2.99 (+ 48.8) | 1.97 (− 2.0) | 2.01 | 2.2 (+ 9.5) | 5.65 (+ 64.7) | 3.59 (+ 4.7) | 3.43 | 3.57 (+ 4.1) | 1.41 (+ 10.2) | 1.16 (− 9.4) | 1.28 | 1.51 (+ 18.0) | 2.38 (+ 27.3) | 1.81 (− 3.2) | 1.87 | 2.13 (+ 13.9) |
| DLP (mGy.cm)a | 110.2 (+ 48.9) | 72.5 (− 2.0) | 74 | 79 (+ 6.8) | 206.9 (+ 65.0) | 131.2 (+ 104.6) | 125.4 | 128.3 (+ 2.3) | 32.2 (+ 10.7) | 26.4 (− 9.3) | 29.1 | 35.2 (+ 21.0) | 55.5 (+ 25.9) | 42.6 (− 3.4) | 44.1 | 50.2 (+ 13.8) |
*The optimal tube voltage as determined by CARE kV on mode
aValues in brackets show percentage difference to reference (ref) dataset (120 kV scan in CARE kV semi mode)