10.19 Imaging 1 Lecture Flashcards
in a CT of the brain, what color is choroid plexus?
white (calcified)
how does extravasated blood in CT scans change over time?
it starts as really bright (high density - looks whiter), but then it gets less dense over time.
Chronic looks like CSF in a CT scan
in a T1 weighted MRI, bone appears _______
dark
in a CT scan of the brain, bone appears _______
white
FLAIR MRI: _______ weighted but with ______
T2
normal CSF nulled out
T1 weighted MRI is “___________” and T2 weighted MRI is “_________”
anatomical
pathological
what is DWI (diffusion-weighted MRI)? what can it show you?
examines the degree of freedom for water molecules to diffuse around
when water can’t diffuse - restrictive diffusion - stroke
in a T2 weighted MRI, bone appears ___________
dark
what kind of scan of the brain is good in emergency situations?
CT, it is fast
in a CT of the brain, what color is CSF?
black
what does fMRI measure? what can it show?
changes in blood oxygen levels to tissues
you can see which areas of the brain are used during functional tasks
in a T1 weighted MRI of the brain, what color is CSF?
gray matter? white matter?
dark
gray
white
what does PET measure?
metabolic activity with radioactive glucose
what does diffusion tensor imaging measure? what can it show you?
looks at directional diffusion of water molecules
can show you white matter tract directions and location
