Table 4

Comparison of the ambient dose equivalent (nSV) at different projection angles

Model	View	Position	PO	P value	Assistant	P value	Nurse	P value	Anaesthetist	P value
Adult	PA/lateral	Conventional	1632±109	<0.01	17±8	<0.01	6±6	0.68	4±6	0.68
	PA/lateral	Upside-down	145±14	<0.01	116±39	<0.01	7±6	0.68	5±6	0.68
	Cranial-LAO/lateral	Conventional	3540±196	<0.01	42±5	<0.01	24±4	0.04	12±4	1
	Cranial-LAO/lateral	Upside-down	106±6	<0.01	175±83	<0.01	19±6	0.04	12±4	1
	Cranial-RAO/lateral	Conventional	2534±123	<0.01	123±51	0.59	15±6	1	7±6	0.19
	Cranial-RAO/lateral	Upside-down	152±10	<0.01	113±25	0.59	15±6	1	11±6	0.19
Paediatric	PA/lateral	Conventional	224±11	<0.01	9±5	<0.01	0±0	0.35	1±4	1
	PA/lateral	Upside-down	127±41	<0.01	50±17	<0.01	1±4	0.35	1±4	1
	Cranial-LAO/lateral	Conventional	468±20	<0.01	30±16	0.09	2±5	1	2±5	0.35
	Cranial-LAO/lateral	Upside-down	179±11	<0.01	52±25	0.09	2±5	1	1±4	0.35
	Cranial-RAO/lateral	Conventional	360±23	<0.01	34±20	0.02	1±4	1	4±6	0.59
	Cranial-RAO/lateral	Upside-down	57±14	<0.01	67±43	0.02	1±4	1	5±6	0.59
Spherical	PA/lateral	Conventional	4184±234	<0.01	124±89	0.06	19±6	0.17	9±5	0.17
	PA/lateral	Upside-down	137±8	<0.01	316±211	0.06	15±5	0.17	11±0	0.17
	Cranial-LAO/lateral	Conventional	4781±194	<0.01	47±5	<0.01	26±6	0.28	15±5	0.55
	Cranial-LAO/lateral	Upside-down	111±4	<0.01	281±163	<0.01	22±6	0.28	14±5	0.55
	Cranial-RAO/lateral	Conventional	2754±65	<0.01	130±58	0.38	19±6	0.35	11±0	0.08
	Cranial-RAO/lateral	Upside-down	129±10	<0.01	165±86	0.38	22±6	0.35	15±6	0.08

LAO, left anterior oblique; RAO, right anterior oblique.