970 / 1245
Scanner homogeneity
▪
Pixel value varies with position on the scanner plate due
to light scattering differences:
▪
small effects (<1%) when moving films parallel to
scan direction
▪
up to 8% variation when moving films perpendicular
to the scan direction, dose dependent.
<2% within 5 cm from the scanner axis for
D<2Gy)
▪
2D correction for “full” films
▪
Dose dependent
▪
Scanner dependent
EPSON Pro 1680 Expression scanner:
Paelinki et al PMB 52 (2007) and Fuss et al PMB 52 (2007)
Fiandra et al MP 33 (2006)
Epson 10000XL scanner
:
Ferreira et al. PMB54 (2009)
Scan direction
0,9273
0,9891
1
0,9859
0,9237
0,9992
0,9939
0,9933
1,0001
position
relative
pixel value
Scan direction