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ECOS I Exam 2 > 30: Neuro Imaging > Flashcards

30: Neuro Imaging Flashcards

1
Q

What is light and dark on a CT?

A 
Dark = least dense (air, CSF)
Bright = most dense (bone)
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2
Q

When looking at CT, what view are you looking at the patient

A

From an inferior view

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3
Q

What vessels are ruptured in an epidural vs subdural hematoma?

A

Epidural: middle meningeal A
Subdural: bridging veins

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4
Q

Why is an epidural hematoma classically shaped like a lens/lemon?

A

Dura separates from skull but is strongly attached at the sutures and wont cross that

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5
Q

Classic history of an epidural hematoma

A

Trauma -> unconscious -> lucid internal -> loss of mental status

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6
Q

Classic shape of subdural hematoma and why

A

Banana/crescent shaped - blood not restricted by sutures but limited by falx cerebri

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7
Q

How MRI works

A
  1. Magnetic field lines up randomly aligned protons
  2. Radiofrequency pulse -> changes proton alignment in magnetic field
  3. Radiofrequency pulse deactivates -> protons realign with magnetic field -> release energy -> read by MRI machine
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8
Q

What does changing the sequence of MRI do?

A

Change color of tissues/fluids, producing different contrasts

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9
Q

Two things you can change in changing MRI sequence

A

TR: repetition time
TE: time echo

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10
Q

TR: Repetition time

A

Time between radiofrequency pulse in MRI

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11
Q

TE: Time Echo

A

Time between radiofrequency pulse and receipt of energy from protons in MRI

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12
Q

What does FLAIR stand for?

A

Fluid attenuated inversion recovery

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13
Q

What is contrast used for in MRI and CT?

A

Find disruptions of BBB

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14
Q

CT vs MRI constrast

A

CT: iodine-based
MRI: gadolinium-based

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15
Q

Con of using contrast in CT/MRI

A

Can cause kidney injury

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16
Q

What do EEG and EMG stand for?

A

EEG: electroencephalogram
EMG: electromyogram

17
Q

Needle electrode exam

A

Tests muscle contraction in response to an electrical signal

18
Q

T1 Weighted MRI Sequence: color of CSF, white matter, gray matter, and inflammation

A

CSF: dark
White matter: light gray
Gray matter: dark gray
Inflammation: dark

19
Q

T2 weighted MRI sequence: color of CSF, white matter, gray matter, and inflammation

A

CSF: bright
White matter: dark gray
Gray matter: light gray
Inflammation: bright

20
Q

T2 FLAIR MRI Sequence: color of CSF, white matter, gray matter, and inflammation

A

CSF: dark
White matter: dark gray
Gray matter: light gray
Inflammation: bright

ECOS I Exam 2 (9 decks)

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