Table 1.

Distribution (%) of the tube voltage in each anatomical region

Anatomical regions	Tube voltage (kV)
	n	80	100	110	120	130	135	140
Head (non-helical)
Adults	536	–	0.2	0.4	93.8	4.3	0.4	0.9
Children (5 years)	318	–	6.0	1.9	89.6	2.2	–	0.3
Head (helical)
Adults	482	0.2	0.8	–	95.4	2.7	0.2	0.4
Children (5 years)	271	–	5.5	1.1	93.0	0.4	–	–
Chest
Adults	584	–	0.5	0.5	95.2	3.4	0.2	0.2
Children (5 years)	274	3.3	13.9	2.9	78.8	0.4	–	–
Abdomen
Adults	570	–	0.5	0.4	95.3	3.7	–	0.2
Children (5 years)	269	2.2	14.5	1.9	79.6	1.1	–	–