Table 4. Equivalent dose (µSv) to tissues and organs in the head and neck from Kodak 9500 large field of view (FOV) (18 × 21 cm) and medium FOV (9 × 15 cm) examinations using default exposure settings for small, medium and large adults and comparing pre-production and current production units.

									Remainder
Field (Adult size)	Unit status	Bone marrow	Thyroid	Oesophagus	Skin	Bone surface	Salivary glands	Brainb	Braina	Lymphatic nodesb	Extrathoracic airwaya	Musclea,b	Oral mucosab
18 × 21 cm (small)	Added filtration	134	471	36	70	485	1513	1017	1017	63	1262	63	1437
18 × 21 cm (medium)	Pre production	292	2000	216	345	1181	4573	2030	2030	190	3736	190	4239
	Added filtration	218	835	131	123	747	2645	1640	1640	114	2286	114	2549
	% reduction	25%	58%	39%	65%	37%	42%	19%	19%	40%	39%	40%	40%
18 × 21 cm (large)	Pre production	399	2045	307	451	1548	5447	2730	2730	233	4669	233	5219
	Added filtration	342	1356	233	182	1098	4161	2694	2694	185	3655	185	4048
	% reduction	14%	34%	24%	60%	29%	24%	1%	1%	21%	22%	21%	22%
9 × 15 cm (small)	Pre production	150	960	89	132	1039	3672	180	180	155	2738	155	3572
	Added filtration	70	475	52	33	255	1582	100	100	68	1196	68	1530
	% reduction	53%	51%	42%	75%	75%	57%	44%	44%	56%	56%	56%	57%
9 × 15 cm (medium)	Pre production	173	1010	117	176	1202	4682	265	265	189	3386	189	4413
	Added filtration	113	533	54	55	386	1680	264	264	94	1738	94	2143
	% reduction	35%	47%	54%	68%	68%	64%	0%	0%	50%	49%	50%	51%
9 × 15 cm (large)	Added filtration	170	840	90	86	547	3612	350	350	156	2836	156	3570

^aICRP 2007; ^bICRP 1990