Table 2.

Correlation coefficients between HU & Average Gray Level obtained via various measurements

	Pearson correlation between HU & Average Gray Level
26 selected areas (average mean of 3 slices); 80 milliseconds (A)	0.577 *
26 selected areas (average mean of 3 slices); 100 milliseconds (A)	0.656 **
26 selected areas (average mean of 3 slices); 200 milliseconds (A)	0.695 **
26 selected areas (1 slice); 80 milliseconds (B)	0.660 **
26 selected areas (1 slice); 100 milliseconds (B)	0.759 **
26 selected areas (1 slice); 200 milliseconds (B)	0.777 **
Correlation Coefficient between two methods of HU calculation	0.949 **

^*Correlation is significant at the 0.05 level (2-tailed)

^**Correlation is significant at the 0.01 level (2-tailed)