Table 2.

Percent dose reduction acquired using bismuth shields.

	1-ply	2-ply	3-ply	4-ply	5-ply	6-ply
80 kVp	7.2	31.6	42.0	42.4	52.1	59.7
100 kVp	15.7	29.6	35.8	40.3	51.2	55.9
120 kVp	11.1	20.6	26.6	33.9	43.5	50.5
140 kVp	15.5	24.3	35.2	36.3	42.3	47.0