Overview Of Cr Technology; Operations; Exposing The Storage Phosphor Screen - Kodak DirectView CR 825 Theory Manual

THEORY GUIDE
10DEC05

Overview of CR Technology

TG4825-1
Page

Operations

17 of 120
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
X-RAY
TUBE
H194_5033BC
latent
aerial
image
image
STORAGE PHOSPHOR SCREEN
Charged storage phosphors
proportional to X-ray energy
absorbed by screen.
Radiography Theory
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