Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

Table 4

Three-way ANOVA and multiple comparison of the CNR.

Source of variation	value (ANOVA)	Multiple comparison	value
Detector	<0.001	Megadixel > VistaScan > Digora	<0.001
Lead	<0.001	With > without	<0.001
Exposure time	<0.001	Standard > half > one-tenth	<0.001
	<0.001	Digora	<0.001
	<0.001	Digora, VistaScan, Megadixel	<0.001
	0.960

ANOVA: analysis of variance; CNR: contrast-to-noise ratio.