Image Matrix Size - Kodak DirectView CR 825 Theory Manual

THEORY GUIDE
10DEC05

Image Matrix Size

TG4825-1
Page
The CR 825/850 SYSTEM scans the STORAGE PHOSPHOR SCREENS at the resolutions in
37 of 120
the table below. The scan rate is the same for General Purpose (GP), High Resolution (HR)
SCREENS, and Enhanced High Resolution (EHR) of the same sizes.
Size of SCREEN
15 x 30 cm
35 x 43 cm
35 x 35 cm
24 x 30 cm
24 x 18 cm
24 x 30 cm (EHR)
24 x 18 cm (EHR)
24 x 18 cm (HR)
24 x 30 cm (HR)
For smaller SCREENS, compared to larger SCREENS:
• pixel size is smaller
• spot size of the laser beam and digitizing rate are the same
• scanning speed is slower. To make smaller pixels, the speed of the horizontal motion of
the laser beam during the fast scan and the transport speed of the SCREEN under the
COLLECTOR during the slow scan decrease. The decrease in pixel size increases the
spatial resolution of the image.
Image Size
Sampling Rate
Pixels x Lines
1280 x 2560 8.33 pixels/mm 115 ± 2
2048 x 2500 5.8 pixels/mm
2048 x 2048 5.8 pixels/mm
2048 x 2500 8.33 pixels/mm 115 ± 2
2392 x 1792 9.95 pixels/mm
4800 x 6000 19.9 pixels/mm
4784 x 3584 19.9 pixels/mm
2392 x 1792 9.95 pixels/mm
2400 x 3000 9.95 pixels/mm
STORAGE PHOSPHOR CASSETTE
Pixel Size Spatial Resolution
in Microns LP = Line Pairs
4.0 LP/mm
168 ± 2 2.8 LP/mm
168 ± 2 2.8 LP/mm
4.0 LP/mm
97 ± 2 4.8 LP/mm
49 ± 2 10.3 LP/mm
49 ± 2 10.3 LP/mm
97 ± 2 5.15 LP/mm
97 ± 2 5.15 LP/mm
File Size
6.5 MB
10 MB
8 MB
10 MB
8 MB
40 MB
30 MB
10 MB
8 MB