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Neurobiology > Introduction to MRI > Flashcards

Introduction to MRI Flashcards

1
Q

what happens in T1 relaxation?

A

realignment with the magnetic field

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2
Q

what are T1 weighted images like with repetition time and time to echo?

A

repetition time is short
time to echo is short

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3
Q

what does CSF look like in T1 weighted images?

A

CSF is dark

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4
Q

what does CSF look like in T2 weighted images?

A

CSF is bright

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5
Q

what does a flair MRI look like?

A

T2 weighted but CSF appears dark

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6
Q

what is flair useful for?

A

differentiates CSF from pathology

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7
Q

what is T2* (star sequence) useful for?

A

to detect hemorrhage
cannot distinguish from mineralization

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8
Q

what is stir like?

A

fat appears dark

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9
Q

what is stir good for?

A

bone and orbit pathology

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10
Q

what is DWI/ADC (diffusion weight images) map good for?

A

ischemia

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11
Q

when is vasogenic edema bright?

A

T2w
FLAIR

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12
Q

what is a mass effect on an MRI?

A

midline shift
ventricular compression
displacement of adjacent structures
herniation
hydrocephalus
syringohydromyelia

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13
Q

what is T1 relaxation?

A

realignment with magnetic field

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14
Q

what is T2 relaxation?

A

stop spinning synchronously

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15
Q

what are T2 weighted images like with repetition time and time to echo?

A

both long

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16
Q

what do T1 weighted images look like?

A

fat bright
CSF dark

17
Q

what do T2 weighted images look like?

A

fat bright
CSF bright

18
Q

what does hemorrhage look like on a T2* image?

A

dark

19
Q

what images are good for ischemia?

A

diffusion weighted images
ADC map

20
Q

what are T1 weighted images good for?

A

anatomy and post contrast

21
Q

what is leptomeningeal (pial) enhancement?

A

visualization of meningeal enhancement that follows the gyri into the sulci

22
Q

how can you tell something is extraaxial?

A

broad-based
strong enhancement
displace brain tissue
distort white matter
can cause bone reaction
can expand ipsilateral subarachnoid space
dural tail

23
Q

what are intraaxial lesions like?

A

surrounded by brain tissue
invade, expand substance of brain
lesions spread across well-defined borders
variable enhancement
no extracerebral changes

Neurobiology (28 decks)

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