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What does CT stand for?
computed tomography
how are ct scans taken?
by emitting x-rays around a body part at a known thickness
ct scans are aquired ____________ but can be reformatted
axially
which has better contrast, a CT scan or a plain film?
CT scan
What unit of measure represents radiodensity in a CT scan?
Hounsfield unit
structures that measure higher on the houndsfield scale are _________ radiodense
more
what is the orientation for viewing CT scans?
in anatomical position as if the person was in front of you
What is the purpose of windowing?
Gets greater detail since the shades of gray we can see are limited
the range of HUs emphasized when windowing
window width
average HU of the tissue of interest when windowing
level
should you be able to distinguish between cortical and spongy bone on standard CT?
no
Why are CT scans useful when a stroke is suspected
can be used to quickly determine if caused by a clot or a bleed
If seen on a CT scan, which type of stroke would lead to administration of a clot buster?
Thromcoembolytic
Why are CT scans helpful in identifying subtle or complex fractures
provides 3D image
When are CT scans useful?
bone issues and acute intracranial bleeding
Disadvantages of CT scans
more radiation exposure than radiographs, artifacts due to patient movement
Note
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