Card Set Information
4 EXPOSURE FACTORS
List the four patient factors and explain their effects on radiographic technique.
Identify four image-quality factors
Optical density is
he degree of blackening of the finished radiograph
Optical density can be controlled in radiography by two major factors:
mAs and SID
Detail describes the
sharpness of appearance of small structures on the radiograph
radiographic density is
The amount of overall blackening of a radiographic image
When a film is exposed, _____ halide crystals are converted to ____ metallic silver.
The latent image is the _____ Image on ______ film, consisting of ______ ions from the interaction with x-rays
A radiograph that appears too dark is said to be overexposed
: An instrument that measures film blackness
Which imaging system has a linear exposure relationship
Focal track :
The area of the anode where x-ray photons are produced by bombardment of electrons from the cathode
which one has the lowest Atomic #
Photoelectric effect absorbed or scattered
compton effect absorbed or scattered
Fat has the ______ water content
The primary problem with fat in terms of radiographic contrast is the _____ effect, not the tissue density, atomic number, or its ability to produce scatter.
Muscle also has the____water content of the tissue groups.
Grids act to _____contrast (higher contrast) by removing _____ before it exposes the image receptor.
(OID) or (SID) does have an effect on contrast
There are two categories of contrast media to consider:
negative contrast media
positive contrast media,
negative contrast media is usually
Scatter radiation has what effect on contrast
a increase i developer time will have what effect on contrast
Collimation will have what effect on contrast