Insights into Imaging

Table 1 Comparison of mean CT doses between current and optimised protocols (confidence interval p < 0.05)

From: Visual grading characteristics and ordinal regression analysis during optimisation of CT head examinations

CT head	GE BrightSpeed			Philips Brilliance
Independent samples t-test	Current	Optimised	p	Current	Optimised	p
	n =24	n =20		n =24	n =20
CTDIvol (mGy)	35.8	33.1	0.00	39.6	28.3	0.00
(Range)	(30.0-37.6)	(29.8-36.1)		(39.6-39.6)	(28.3-28.3)
DLP (mGy-cm)	489.4	461.5	0.03	694.8	637.3	0.03
(Range)	(420.0-564.0)	(389.2-575.1)		(491.0-820.0)	(541.1-823.1)

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