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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