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

EJNMMI Physics

Table 2 Reference mAs, delivered mAs, CTDI_vol 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)