THEORY GUIDE Radiography Theory
10DEC05
TG4825-1
Page
13 of 120
Section 2: Radiography Theory
Comparison of Film/Screen and Computed Radiography (CR)
X-rays are used in medical imaging to make an image of given body parts on a surface,
which can be read by a Radiologist or other medical personnel. The available systems for
capturing these images are:
• Screen/film - captures a projection image on an X-ray film
• Computed Radiography (CR) - captures a digital image
(Film or Viewer)
IMAGE
AERIAL
FINAL VISIBLE
IMAGE
SCREEN
ENHANCED
PROCESSING
(CRT)
visible imagelatent image
(Storage Phosphor)
CONVERSIONS
FILM PROCESSING
visible image
(On Film)
PHOSPHOR
TUBE
X-RAY
STORAGE
SCREEN
FILM/
TUBE
X-RAY latent image
(On Film)
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