Table 2.

Coefficient of Variation Results^a

DRO	Approximate Volume	Surface Area	2D Diameter	3D Diameter	Sphericity	Mean Intensity	Standard Deviation	Kurtosisb	GLCM Entropy
Uniform Phantom	0.004%	13.41%	0.23%	0.27%	12.82%	0.00%	—	—	1002%
Intensity Varying Phantom	0.004%	13.41%	0.23%	0.27%	12.82%	0.00%	0.11%	0.31%	50.9%
Shape Varying Phantom	0.010%	12.27%	0.71%	0.18%	11.70%	0.00%	—	—	625%

^aCV results are expressed as a percentage for each feature and each DRO across all 13 submissions. Note that there was no value for standard deviation and kurtosis for the uniform phantom and shape varying phantom, as the intensity values for these phantoms were all set to the same value (100 HU).

^bw/Fisher correction.