Table VIII.

Mean CT numbers of the 4.8 mm diameter reference nodules for the high resolution, the modified 1.25 mm slice NLST, and the standard NLST techniques.

		High resolution		1.25 mm slice NLST		Standard NLST
	Nodule no.	Mean	Standard deviation	Mean	Standard deviation	Mean	Standard deviation
100 mg/cc	1	47.5	0.4	39.8	9.5	−88.3	11.8
	2	44.3	2.1	43.4	7.1	−78.7	20.4
	3	44.3	2.2	41.6	7.0	−68.2	7.8
	4	42.0	0.6	33.0	7.6	−66.2	6.6
	5	40.7	2.4	45.0	7.6	−72.6	10.5
Overall mean		43.8±2.6		40.6±4.6		−74.8±9.0
50 mg/cc	6	−2.8	1.5	−4.4	2.5	−116.5	0.3
	7	−8.0	2.2	−18.9	7.4	−127.1	4.6
	8	−10.2	0.4	−37.8	4.8	−149.1	22.7
	9	−8.6	2.2	−20.5	2.0	−141.1	2.0
	10	−8.9	0.8	−23.0	7.0	−157.2	4.7
Overall mean		−7.7±2.8		−20.7±11.6		−138.2±16.4