Figure 1-50.Operator control panel.
discussed (e.g., incorrect horizontal angulation
produces superimposed radiographic images, and
incorrect vertical angulation produces images that may
be foreshortened or elongated.) The following are
additional causes of faulty radiographs:
No image (fig. 1-51): The film was immersed in
the fixer before the developer. If the film is completely
clear, it was never exposed.
Very light image (fig. 1-52): The film was
underexposed (kilovoltage too low); the developer was
Figure 1-51.No image.
Figure 1-53.Partial image (cone cutting).
Figure 1-52.Very light image.
weak; or the film was not left in the developer long
Very dark image: The film was over-exposed
(kilovoltage too high); the developer was too warm; or
the film was left in the developer too long.
Partial image (fig. 1-53): The film was not
completely immersed in the developer; the film came
into contact with other film or the side of the tank while
in the developer; or the film or tube head was incorrectly
positioned (cone cutting).
Blurred image: The patient or tube head moved
during the exposure.
The film was outdated or
contaminated; the film was overexposed by being held
too close to the safelight; the film was exposed to stray
radiation, excessive heat, chemical fumes, or lightleaks
in the darkroom; the developer was improperly mixed,
contaminated, or too hot.
Streaked or stained film: The film was
insufficiently washed or fixed; the processing solutions
were dirty; or the film hanger was dirty.