Brain Imaging (Lecture #4) Flashcards
what color will very dense material come up as on a CT scan
white
what color will not-very-dense material come up as on a CT scan
black
list materials in brain from least dense to most dense
air fat water CSF white matter grey matter fresh blood bone
where can you always find the 3rd ventricle on a CT
between thalami
where is it normal to see calcifications (white spots), especially in older patients
choroid plexus (blood vessels in ventricles)
slice names from inferior to superior
X star happy face frowny face worms coffee bean
what will infarcted tissue appear as on a CT
hypodense (dark)
what will hemorrage appear as on a CT
hyperdense (white)
mass effect
shift in brain to one side due to too much of something on one side of the brain
effacement
flattening of the ventricles as a result of mass effect
what do mass effect and effacement indicate
too much pressure on the brain
does MRI use radiation
no
what color does water appear in an MRI
light
more water=lighter
types of images MRIs produce
T1
T2
Proton weighted
how to describe MRI images
hyperintensity=whiter than surrounding tissue (hypodensity on a CT)
hypointensity= darker than surrounding tissue (hyperdensity on a CT)
