Insights into Imaging

Table 1 Mean reconstruction time for filtered back projection and iterative CT reconstructions

From: Iterative reconstruction does not substantially delay CT imaging in an emergency setting

	Time (s)					P value^a			Slices (N)
	FBP	L2	Percentual delay	L4	Percentual delay	FBP vs L2	FBP vs L4	L2 vs L4
CTA ^b	25.5 ± 1.4	35.6 ± 1.8	+40 %	37.6 ± 2.4	+47 %	<0.001	<0.001	0.057	647.8 ± 16.6
	FBP	L1	Percentual delay	L6	Percentual delay	FBP vs L1	FBP vs L6	L1 vs L6
Total body ^c	18.1 ± 0.9	28.3 ± 1.0	+56 %	27.8 ± 1.1	+54 %	<0.001	<0.001	0.255	200.2 ± 6.6
Abdominal ^c	33.2 ± 1.7	44.3 ± 1.8	+33 %	45.7 ± 2.1	+38 %	<0.001	<0.001	0.139	674.1 ± 21.8
Chest ^c	20.1 ± 1.1	28.2 ± 1.4	+40 %	27.8 ± 1.5	+38 %	<0.001	<0.001	0.633	389.6 ± 16.3
Cervical ^c	15.9 ± 0.6	30.8 ± 0.9	+94 %	31.0 ± 0.9	+95 %	<0.001	<0.001	0.780	476.2 ± 16.1
Total trauma CT	87.3 ± 14.6	131.7 ± 16.7	+51 %	132.2 ± 17.9	+51 %	<0.001	<0.001	0.921	1740.1 ± 213.5

FBP filtered back projection, L2 iDose⁴ level 2, L4 iDose⁴ level 4
^aBased on dependent t-test
^bn = 25
^cn = 15

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