Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems
Table 2
Contrast-to-noise ratio for each detector.
Dose
Digora
VistaScan
Megadixel
Pb (−)
Pb (+)
Pb (−)
Pb (+)
Pb (−)
Pb (+)
mean (SD)
mean (SD)
mean (SD)
mean (SD)
mean (SD)
mean (SD)
Standard
0.31 (0.48)
2.63 (1.07)
5.46 (0.60)
5.63 (1.42)
10.70 (0.06)
10.28 (0.09)
Half
0.64 (0.47)
2.23 (1.27)
4.26 (0.26)
4.48 (0.98)
7.51 (0.10)
7.48 (0.19)
One-tenth
0.27 (0.29)
1.20 (0.52)
2.16 (0.17)
1.94 (0.07)
4.79 (0.20)
6.11 (0.33)
Each dose for CCD (Megadixel) is half of that for PSP (Digora and VistaScan). Pb shows the existence of lead during exposure. (−) and (+) mean without and with lead.