Table 5.

Range of misrepresentation of the centroid of the 10- and 31.5-mm diameter targets.

Target Diameter (mm)	S-I Motion Amplitude ± (mm)	Centroid mis-placement (mm), single-slice fast scan CT
		S-I		A-P		R-L
		Mean	95% CI	Mean	95% CI	Mean	95% CI
10	5	-0.8	6.2	0.2	1.0	0.6	1.2
	10	-1.1	5.2	0.3	2.2	0.7	1.8
	15	-0.7	7.0	0.2	1.4	1.6	3.0
31.5	5	-2.2	5.2	-0.2	0.2	-0.1	0.6
	10	-2.7	4.2	-0.3	1.4	0.4	1.6
	15	-2.5	8.8	-0.5	1.0	0.1	1.2
Target Diameter (mm)	S-I Motion Amplitude ± (mm)	Centroid mis-placement (mm), multi-slice fast scan CT
		S-I		A-P		R-L
		Mean	95% CI	Mean	95% CI	Mean	95% CI
10	5	1.1	4.6	0.0	1.4	0.5	0.6
	10	0.4	3.0	0.0	1.4	0.4	1.2
	15	0.4	5.4	0.1	1.6	0.2	1.0
31.5	5	0.5	3.4	0.3	0.8	0.7	0.8
	10	1.2	5.4	0.1	1.0	1.1	1.2
	15	2.0	5.4	-0.4	0.8	0.8	1.2
Target Diameter (mm)	S-I Motion Amplitude ± (mm)	Centroid mis-placement (mm), single-slice slow scan CT
		S-I		A-P		R-L
		Mean	95% CI	Mean	95% CI	Mean	95% CI
10	5	-0.2	1.8	1.2	2.4	2.4	2.8
	10	-0.9	2.6	3.3	1.4	4.2	1.8
	15	-1.3	1.4	5.9	3.6	7.1	3.6
31.5	5	-2.2	3.4	0.0	1.0	1.3	3.6
	10	-1.8	2.6	0.0	2.4	0.8	2.2
	15	-2.8	2.4	0.9	3.4	1.6	2.4

From top to bottom, the tables were generated from single-slice fast (or 1-sec), multi-slice fast (or 1-sec), and single-slice slow (or 4-sec) scan acquisition techniques, respectively. Ranges were computed for three known motion amplitudes.