THEORY GUIDE STORAGE PHOSPHOR CASSETTE
10DEC05
TG4825-1
Page
35 of 120
The CR 825/850 SYSTEM uses SCREENS with the following resolutions.
The light intensity of the exposed GP-25 SCREEN is less than the HR and EHR SCREENS.
The CR 825/850 SYSTEM adjusts for the difference in light intensity by adjusting the pixel
code values in the image processing.
Resolution of the
SCREEN
Description
General Purpose
(GP-25)
• thicker PHOSPHOR COATING than the HR SCREEN, making the
image less sharp
• no special exposure procedures are necessary
High Resolution
(HR)
• thinner PHOSPHOR COATING than the GP-25 SCREEN, making
the image sharper
• approximately 2 times the X-ray exposure is necessary
Enhanced High
Resolution (EHR)
• thinner PHOSPHOR COATING than the HR SCREEN, improving the
image quality
• approximately 4 times the X-ray exposure
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