Table 1.

Patients’ demographics and CT scanner manufacturer and acquisition parameters plus overscanning ranges selected by the technologist in both directions in the whole dataset categorized by centers

Database	Gender		DAP (cm)	DLat (cm)	Scanner Manufacturer	Tube current (mA)	CTDIvol (mGy)	SSDE (mGy)	DLP (mGy.cm)	Overscanning (mm)
										Superior	Inferior
	Male	Female	Mean ± STD	Mean ± STD		Mean ± STD	Mean ± STD	Mean ± STD	Mean ± STD	Mean ± STD	Mean ± STD
C1	260	223	23.3 ± 2.3	31.1 ± 3.6	GE	186.2 ± 34.0	8.47 ± 0.53	11.69 ± 0.85	97 ± 24	19.6 ± 10.9	42.3 ± 29.9
C2	759	564	24.1 ± 2.7	32.0 ± 3.7	GE	228.4 ± 27.2	6.82 ± 1.02	9.04 ± 0.98	19 ± 15	2.27 ± 1.71	1.89 ± 2.39
C3	435	303	23.7 ± 2.7	31.2 ± 3.6	Siemens	123.6 ± 9.6	3.40 ± 0.42	4.65 ± 0.6	33 ± 11	25.0 ± 19.0	54.0 ± 37.2
C4	978	929	23.2 ± 3.0	31.7 ± 4.0	Siemens	147.1 ± 43.2	6.13 ± 2.07	8.21 ± 2.14	103 ± 36	28.0 ± 11.5	33.7 ± 21.3
C5	196	171	22.7 ± 3.1	31.4 ± 4.1	Siemens	151.1 ± 47.8	6.22 ± 2.17	8.48 ± 2.52	106 ± 39	29.2 ± 12.3	37.8 ± 22.6
C6	465	412	24.2 ± 3.0	33.1 ± 3.7	Siemens	166.2 ± 51.3	4.30 ± 1.54	5.49 ± 1.50	79 ± 29	30.0 ± 11.4	39.6 ± 22.1
C7	869	779	22.7 ± 2.8	30.4 ± 3.9	NMS	220.7 ± 27.9	8.92 ± 1.40	12.61 ± 1.89	199 ± 33	30.9 ± 12.2	35.3 ± 26.1
C8	518	530	23.0 ± 3.8	31.5 ± 5.0	Phillips	89.3 ± 48.2	3.73 ± 2.09	5.05 ± 2.62	59 ± 34	23.5 ± 13.2	24.8 ± 21.7
C9	1489	1300	23.3 ± 2.9	31.2 ± 3.8	Siemens	174.0 ± 37.5	5.91 ± 1.52	7.99 ± 1.49	149 ± 42	25.7 ± 12.3	37.3 ± 21.9
C10	594	372	23.2 ± 3.2	31.0 ± 4.6	Siemens	210.7 ± 39.6	5.57 ± 1.21	7.69 ± 1.65	47 ± 27	24.0 ± 17.9	37.9 ± 39.1
D1	NA	NA	20.4 ± 3.1	26.7 ± 5.4	NA	NA	NA	NA	NA	32.6 ± 10.9	26.0 ± 17.2
D2	NA	NA	23.3 ± 3.3	29.7 ± 4.8	NA	NA	NA	NA	NA	34.7 ± 13.3	34.8 ± 22.4
D3	NA	NA	23.0 ± 3.2	30.6 ± 4.2	NA	424.0 ± 191.8	NA	NA	NA	22.1 ± 12.4	40.6 ± 35.6