Brain Imaging (Lecture #4) Flashcards Preview

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Flashcards in Brain Imaging (Lecture #4) Deck (17):
1

what color will very dense material come up as on a CT scan

white

2

what color will not-very-dense material come up as on a CT scan

black

3

list materials in brain from least dense to most dense

air
fat
water
CSF
white matter
grey matter
fresh blood
bone

4

where can you always find the 3rd ventricle on a CT

between thalami

5

where is it normal to see calcifications (white spots), especially in older patients

choroid plexus (blood vessels in ventricles)

6

slice names from inferior to superior

X
star
happy face
frowny face
worms
coffee bean

7

what will infarcted tissue appear as on a CT

hypodense (dark)

8

what will hemorrage appear as on a CT

hyperdense (white)

9

mass effect

shift in brain to one side due to too much of something on one side of the brain

10

effacement

flattening of the ventricles as a result of mass effect

11

what do mass effect and effacement indicate

too much pressure on the brain

12

does MRI use radiation

no

13

what color does water appear in an MRI

light
more water=lighter

14

types of images MRIs produce

T1
T2
Proton weighted

15

how to describe MRI images

hyperintensity=whiter than surrounding tissue (hypodensity on a CT)
hypointensity= darker than surrounding tissue (hyperdensity on a CT)

16

advantage of MRI

ability to detect detail

17

disadvantages of MRI

time
pt can't have metal in body
fresh blood difficult to detect
bone fx difficult to detect