THEORY GUIDE STORAGE PHOSPHOR CASSETTE
10DEC05
TG4825-1
Page
37 of 120
Image Matrix Size
The CR 825/850 SYSTEM scans the STORAGE PHOSPHOR SCREENS at the resolutions in
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.
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.
Size of SCREEN
Image Size
Pixels x Lines
Sampling Rate
Pixel Size
in Microns
Spatial Resolution
LP = Line Pairs
File Size
15 x 30 cm 1280 x 2560 8.33 pixels/mm 115 ± 2 4.0 LP/mm 6.5 MB
35 x 43 cm 2048 x 2500 5.8 pixels/mm 168 ± 2 2.8 LP/mm 10 MB
35 x 35 cm 2048 x 2048 5.8 pixels/mm 168 ± 2 2.8 LP/mm 8 MB
24 x 30 cm 2048 x 2500 8.33 pixels/mm 115 ± 2 4.0 LP/mm 10 MB
24 x 18 cm 2392 x 1792 9.95 pixels/mm 97 ± 2 4.8 LP/mm 8 MB
24 x 30 cm (EHR) 4800 x 6000 19.9 pixels/mm 49 ± 2 10.3 LP/mm 40 MB
24 x 18 cm (EHR) 4784 x 3584 19.9 pixels/mm 49 ± 2 10.3 LP/mm 30 MB
24 x 18 cm (HR) 2392 x 1792 9.95 pixels/mm 97 ± 2 5.15 LP/mm 10 MB
24 x 30 cm (HR) 2400 x 3000 9.95 pixels/mm 97 ± 2 5.15 LP/mm 8 MB
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