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Flashcards in Imaging Of The Brain/vasculature Deck (42)
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1

25 y/o male presents to the ER with head trauma. Diagnostic test of choice?

CT brain without contrast

2

Which imaging modality of the brain causes no radiation exposure to the patient?

MRIq

3

55 y/o female presents to the ER with unilateral weakness, onset 30 minutes ago. Initial diagnostic test of choice?

CT brain without contrast

4

What are the imaging options for the brain?

-CT
-MRI

5

CT

-high radiation dose to patient
-quick examination
-expensive
-mainstay and test of choice in the initial imaging of the brain in trauma and stroke like symptoms (WITHOUT CONTRAST)

6

What is the mainstay and test of choice in the initial imaging of the brain in trauma and stroke like symptoms (without contrast)?

CT

7

What kind of tests would you do a CT without contrast?

Trauma, stroke-like symptoms
Used in assessment of altered mental status, headache, dizziness, vertigo, evaluation of the paranasal sinuses

8

CT brain with contrast

-not performed in initial assessment
-used in assessment of abnormal enhancement patterns such as masses, vascular abnormality. MRI also used in similar capacity. MRI more sensitive than CT

9

What is used in assessment of abnormal enhancement patterns such as masses, vascular abnormality such as avascular malformation?

CT with contrast

10

which is more sensitive? MRI or CT?

MRI

11

What parts of the brain anatomy should you see in a CT of a healthy brain?

-midline flax
-frontal horns of lateral ventricles
-third ventricle
-basal cistern
-skull
-scalp

12

What part of the brain would you need to scan if someone complained of vision problems?

Occipital

13

MRI

-no radiation
-very expensive
-takes longer than CT therefore motion sensitive
-DWI: most sensitive sequence in radiology in the assessment of acute ischemia
-typically done with and without contrast

14

When do you typically do MRI?

After you do a CT and it shows something abnormal

15

TPA

-very dangerous
-make sure they aren't bleeding anywhere
-extreme blood thinner
-not goof to look for blood

16

Which takes longer? MRI or CT?

MRI

17

DWI

Most sensitive sequence in radiology in the assessment of acute ischemia

18

Contraindications of MRI

-pacemaker, radioplate foreign bodies, claustrophobia

19

Welders and MRI

Must do an xRay on eyes to make sure there is no metal pieces lodged in eye before getting into MRI so as to not rip through optic nerve and ophthalmic artery

20

What contrast used in CT?

Iodine contrast

21

What contrast used in MRI?

MGd

22

What is good for people who are allergic to contrast?

MGd. It contains gadilium. Very rare to have allergy with this

23

Imaging options in the assessment of the cerebral vasculature

-CTA
-MRA
-ultrasound
-digital angiography

24

CTA contraindications

Allergy, renal insufficiency

25

How do you get around patients having an allergy to iodine when you must do a CTA?

Harvard Prep hours before CT

26

How do you get around renal insufficiency when a CTA must be done?

Hydrate pt well or dialysis

27

What kind of images can you get with CTA?

-axial, coronal, sagittal, reformatted

28

What is the number one place that saccular aneurysms occur?

Anterior communicating artery (posterior is second)

29

MRA

Good to assess vascular without contrast

30

Contraindications of MRA

Same as MRI