Table 1.

Sample sizes for the “standard” systems (rooms 1 and 2) and the “dose reduction” system (room 3)

		Room 1	Room 2	Room 3
X-ray system		Standard	Standard	Dose reduction
No. clinical procedures		1659	2683	667
No. total radiation events		110,676	159,849	70,522
% of total KAP with	No added filtration	74%	72%	10%
	0.1 mm Cu +1 mm Al	2%	2%	20%
	0.4 mm Cu +1 mm Al	4%	4%	70%
	0.9 mm Cu +1 mm Al	20%	22%	0%

The use of the different filtrations in the three rooms in this sample is shown as the % of the total KAP delivered.