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Exposure
Time
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Exposure time
is one of the most important considerations in determining whether an x-ray
machine is adequate for large-animal
examinations. Exposure times of 0.1 sec or less generally ensure that the
problem of motion during the exposure will
be minimal.
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If the exposure times are longer than 0.1 sec, there will
frequently be motion of the horse, film holder, or tube. The range of available
exposure times is great, and some units
have minimum settings of 0.003 and 0.001
sec.
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Reviewing the relationship between ma
and exposure
time, it is obvious that a short exposure time can be obtained only in
association with the utilization of a high
milliamperage.
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Conversely, a machine with a low milliamperage (15-30 ma)
must utilize exposure times of rather
long
duration (0.1-0.5 sec).
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