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Table 2 Reference mAs, delivered mAs, CTDIvol and DLP for each phantom and tube voltage

From: Validation of CARE kV automated tube voltage selection for PET-CT: PET quantification and CT radiation dose reduction in phantoms

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)
  1. *The optimal tube voltage as determined by CARE kV on mode
  2. aValues in brackets show percentage difference to reference (ref) dataset (120 kV scan in CARE kV semi mode)