Table 2.

Summary of measurements of the $X$-, $Y$-, and $Z$-dimension maximum orthogonal lengths, RECIST measure, and volume for the Teflon sphere (specified diameter 15.88 mm, volume of $2094.79{\mathrm{mm}}^3$) using constant and adaptive threshold segmentation for the study data set of 77 patients with 162 CT scans.

	Measure	Mean	Std. error of the mean	Systematic error		Random error		CV($\times 100$) relative to RECIST
				Mean bias	Bias % error	Standard deviation	CV ($\times 100$)
Constant	$X$ length	15.65	0.01	$-0.22$	$-1.41$	0.10	0.65	1.08
	$Y$ length	15.56	0.01	$-0.32$	$-1.99$	0.11	0.71	1.17
	$Z$ length	15.66	0.05	$-0.22$	$-1.36$	0.59	3.75	6.21
	RECIST	15.59	0.01	$-0.29$	$-1.81$	0.09	0.60	1.00
	Volume	1978.80	7.68	$-116.00$	$-5.54$	97.80	4.94	8.18
Adaptive	$X$ length	15.84	0.01	$-0.04$	$-0.25$	0.08	0.51	1.02
	$Y$ length	15.72	0.01	$-0.15$	$-0.95$	0.09	0.56	1.13
	$Z$ length	15.88	0.05	0.00	0.02	0.58	3.68	7.36
	RECIST	15.75	0.01	$-0.13$	$-0.79$	0.08	0.50	1.00
	Volume	2049.19	7.61	$-45.61$	$-2.18$	96.85	4.73	9.46