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Neuro-Malloy > Neuro-Imaging > Flashcards

Neuro-Imaging Flashcards

(38 cards)

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1
Q

What are the 2 most important sections to view the orbit?

A

Axial, Coronal

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2
Q

CT scans focuses on what?

A

Tissue density

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3
Q

MRI focus on what?

A

Tissue signal intensity

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4
Q

On a CT scan, an isodense area will be what color? What does this represent?

A
  • isodense = gray

- represents brain tissue

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5
Q

On a CT scan, a hypodense area will be what color? What does this represent?

A
  • hypodense = black

- represents air, CSF, fat

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6
Q

On a CT scan, a hyperdense area will be what color? What does this represent?

A
  • hyperdense = white

- represents hemorrhage, Calcium, Metal, Bone, Iodine

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7
Q

A CT scan is good for looking at what 2 things due to trauma?

A

Bone and Blood

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8
Q

What test is helpful to detect nerve sheath meningiomas, r/o fractures, subdural and subarachnoid hematomas, skull fractures, sinusitis, etc?

A

CT scan

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9
Q

What to sections are only available in a CT scan?

A

Axial and coronal

- no sagittal sections

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10
Q

What are the advantages of a CT scan?

A
  1. Cheaper
  2. No weight limits
  3. Meningiomas
  4. Rapid
  5. Readily available
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11
Q

CT scans are contraindicated in what 2 persons?

A

Pregnant women and children

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12
Q

A CT scan with contrast is contraindicated in what 3 persons?

A
  1. Bronchial Asthma
  2. DM
  3. Kidney disease
  4. Iodine allergy
  5. Previous rxn
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13
Q

What must you order for a patient prior to doing CT with contrast?

A

Check BUN/creatinine levels

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14
Q

A CTA scan looks at what?

A

Arteries (contrast is necessary)

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15
Q

This type of test is used to define anatomic details, vascular malformations, aneurysms and vascularized tumors.

A

CT contrast enhancement

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16
Q

A CTA is used to look for what 3 things?

Study These Flashcards
A
  1. Aneurymsms
  2. Stenosis
  3. Arterial Venous Malformation (AVMs)
17
Q

An MRI is good for looking at what 2 things?

Study These Flashcards
A
  1. Anatomy

2. Soft Tissue

18
Q

Is there radiation exposure associated with an MRI? CT scan?

Study These Flashcards
A
  1. MRI = no

2. CT = yes, ionizing radiation

19
Q

What are the contraindicatios for MRI use?

Study These Flashcards
A
  1. Pacemakers
  2. Anything metal
  3. Claustrophobia
  4. Weight limitations
  5. Medication patches
  6. Previous allergy to contrast medium
20
Q

In a T1 weighted MRI, what color will the CSF/vitreous be?

21
Q

In a T2 weighted MRI, what color will the CSF/Vitreous be?

22
Q

A T2 weighted image has a pulse repetition time ____ than 1000 msecs and is good for viewing what?

Study These Flashcards
A
  • Greater than 1000 msec

- Good for seeing pathology (H20/edema)

23
Q

A T1 weighted image has a pulse repetition time ____ than 1000 msecs and is good for viewing what?

Study These Flashcards
A
  • less than 1000 msecs

- good for viewing anatomy

24
Q

Which type of MRI can only be used with contrast?

25
What type of imaging would you do to look at periventricular white changes found in MS?
MRI FLAIR
26
What type of imaging would be used to diagnose acute infarcts?
MRI- DWI
27
What do you use in conjunction with a DWI to determine if it's a true stroke or T2 shine through?
ADC - Apparent Diffusion coefficient
28
What type of imaging is best to view blood? Why?
MRI- Gradient Echo (GRE) | - because every stage of blood is black in a GRE
29
What type of imaging would be used to view microaneurysms, small blood vessels and large vascular structures in the brain?
SWAN = susceptibility weighted MR Angiography
30
What test is best used for viewing cranial nerves traveling through the CSF?
FIESTA/CISS
31
Which MRI is best to look at flowing and stationary nuclei (i.e. CSF)?
Phase Contrast MRi
32
Which MRI is best to look at CSF flow while the heart is beating?
Phase Contrast Cine
33
What imaging is best for viewing CSF at any region in the CNS and visualize its movment for up to 5 seconds? (independent of cardiac cycle)
Time-SLIP | - looking at one specific area to watch it's movement
34
To understand CSF flow disorders, this imaging quantifies CSF flow velocities.
Phase Contrast
35
To understand CSF flow disorders, this imaging visualizes CSF flow characteristics, pathways and blockages.
Time-SLIP
36
What is the contrast media used for an MRI? Is it iodine based?
Gadolinium - not iodine based - only used in T1
37
When would you need contrast in a n MRI?
If suspected mass, metastasis, abscess, inflammation and infiltration
38
What is the major side effect of gadolinium?
Nephrogenic Systemic Fibrosis

Neuro-Malloy (16 decks)

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