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anatomy unit 3 > neuroimaging > Flashcards

neuroimaging Flashcards

1
Q

are structures that are more dense bright or dark

A

bright

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2
Q

are structures that are less dense bright or dark

A

dark

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3
Q

is fat more or less dense than water

A

fat is less dense than water

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4
Q

is acute blood more or less dense than water

A

acute blood is more dense than water

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5
Q

what is the most common modality for head imaging

A

CT

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6
Q

normal blood number

A

40 HU

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7
Q

acute blood (clotted) number

A

60-90 HU

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8
Q

fat number

A

-100 HU

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9
Q

what structures are found in suprasellar cistern

A

optic chiasm
pituitary gland
circle of willis

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10
Q

what lobe is located in the anterior fossa

A

frontal lobe

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11
Q

what lobe is located in the middle fossa

A

temporal lobe

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12
Q

what lobe is located in the posterior fossa

A

cerebellum

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13
Q

early sign of ischemic stroke

A

hyper dense MCA

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14
Q

what can mimic hyper dense MCA sign

A

calcification

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15
Q

hyper-acute phase — early

A

0-4 hours

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16
Q

hyper-acute phase — late

A

4-24 hours

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17
Q

acute phase

A

1-7 days

18
Q

subacute phase

A

1 week - 6 months

19
Q

when do we see fogging concept

A

subacute phase

20
Q

chronic phase

A

6 months+

21
Q

what is the most common cause of subarachnoid hemorrhage

A

aneurysm

22
Q

abnormal tissue has poor circulation so what will we see on CT with contrast

A

brighter due to delayed clearance of contrast

23
Q

what is the biggest difference between CT head with contrast and CTA

A

time

24
Q

what is the most precise method of brain imaging

A

MRI

25
Q

proton releases energy up to how many times per second depending on sequence

A

2-50+ times

26
Q

what MRI modality is good for evaluation of anatomy

A

T1

27
Q

blood vessels are easier to see on what type of MRI

A

T2

28
Q

what type of MRI best highlights inflammation

A

FLAIR

29
Q

major difference between FLAIR and T2

A

FLAIR has CSF signal cancelled
periventricular lesions more visible

30
Q

DWI measures what more than anything else

A

proton movement

31
Q

DWI stands for

A

diffusion weighted imaging

32
Q

for DWI – more movement is

A

darker

33
Q

for DWI – less movement is

A

brighter

34
Q

on DWI, if there is decreased blood flow to an area, how will it look on imaging

A

decreased movement –> brighter

35
Q

DWI is extremely useful in

A

ischemic stroke

36
Q

DWI can measure ischemia in less than

A

less than 3 hours

37
Q

DWI should never be used without also reviewing the

A

ADC

38
Q

what does ADC stand for

A

apparent diffusion coefficient

39
Q

DWI is a calculation that is superimposed over a

A

T2 image

40
Q

does MRA require contrast?

A

no

anatomy unit 3 (5 decks)

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