CT Flashcards
gantry
circular roatating frame
houses the x-ray tube with detectors
main steps in a CT scan
small slices are put together for a better image
what are the collimators made of nd what do they do
lead
pre patient- determines slice thickness
post patient - reduces the amount of scatter
kVP
accelerating voltage
tube current
effects rate of x-rays produced
focal spot size
smaller the higher the res.
exposure in CT vs x-ray
is much higher in CT due to time to get image
pros of CT
fast, available, detailed
cons of CT
high level of exposure
benifits of multi detector helical CT
increased efficiency
less exposure
multiplanar reconstruction
can see in coronal or sagittal views
done by stacking images and interpolation
high density
brighter
mRI vs CT
MRI better at soft tissue
CT better at bone vs tissue
