Module 1: Intro to CT Flashcards
CT was invented when and by who?
1970s by Sir Godfrey Hounsfield and Allan Cormack
who came up with the different values of anatomy in CT?
hounsfield
What determines slice thickness for multidetector CT scanners?
size of detector array
what plane does CT perform scans by?
axial
major components of CT:
gantry
computer
operator console
temporal resolution is the ability of the CT scanner to do what?
image fast moving objects and relate to time/speed at which data may be captured
window width controls the displayed image _________.
contrast
A wide window width will produce a low contrast image
true
a window level controls image ____________
brightness
in general, fat has a CT number of
-100
which of the following measures will reduce the dose during a pediatric CT study?
A. decrease kV
B. decrease slice thickness
C. increase slice thickness
D. 0.5:1 pitch ratio
increase slice thickness
A 2:1 pitch ratio is an example of undersampling.
true
advantages of multislice vs single
superior image quality
less contrast required
improved spatial resolution
CT term for a field size-tissue slice (volume element)
voxel
a technique used to view vessels demonstrated in CT defines:
maximum intensity projection (MIP)
divisions of the central nervous system
brain and spinal cord
dendrites are processes that conduct impulses ________ the neuron cell body
toward
axons conduct impulses ____________ the neuron cell body
away from
the divisions of the brain are the:
forebrain
midbrain
hindbrain
which structures make up the brain stem?
midbrain, pons, and medulla
how many lobes make up the cerebrum?
5
meninges from outer to inner:
dura
arachnoid
pia
what is the name of the pathway for CSF between the third and fourth ventricles?
cerebral aqueduct
daily CSF output
500 mL
