THEORY GUIDE Radiography Theory
10DEC05
TG4825-1
Page
17 of 120
Overview of CR Technology
Operations
The following operations are necessary to capture the latent image in the STORAGE
PHOSPHOR SCREEN and change it to a digital image that can be viewed on a computer
screen and sent to a PRINTER.
• Exposing the STORAGE PHOSPHOR SCREEN
• Stimulating the PHOSPHOR
• Changing Light Energy to an Analog Signal
• Changing Analog Signals to Digital Signals
• Processing the Digital Image
Exposing the STORAGE PHOSPHOR SCREEN
H194_5033BC
absorbed by screen.
proportional to X-ray energy
Charged storage phosphors
STORAGE PHOSPHOR SCREEN
latent
image
aerial
image
TUBE
X-RAY
Lighter values indicate that more
x-rays were absorbed by the
SCREEN - bone tissue
Mid-range values indicate that fewer
x-rays were absorbed by the
SCREEN - soft tissue
Darker values indicate that most
x-rays were absorbed by the
SCREEN - did not pass through the body
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