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Flashcards in Basics of MRI Deck (16)
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1
Q

Principal of MRI

A

Proton spins are affected by a very strong magnetic field

They can absorb a small wavelength of light and then re-emitt, producing images

2
Q

Quench

A

The process of shutting down an MRI

Both expensive and dangerous due to the release of toxic gas

3
Q

Things that prevent patients from getting MRI

A
  • Foreign bodies
  • Contrast contraindication (AKI, pregnancy)
  • Claustrophobia
4
Q

Foreign bodies on MRI

A

Appear as a “black hole”

5
Q

Gadolinium contrast

A
6
Q

Unlike iodinated contrast, gadolinium contrsat is not. . .

A

. . . nephrotoxic

So creatinine does NOT matter

7
Q

Nephrogenic systemic fibrosis

A
8
Q

Three main modes of MRI

A

T1

T2

Proton density

9
Q

HASTE

A

Rapid MRI sequence

10
Q

T1 features

A
11
Q

Best way to differentiate T1 and T2

A

Simple fluid is bright on T2

12
Q

Best way to differentiate contrast from noncontrast MRI

A

Nasal sinuses (highly vascular)

13
Q

T2 features

A
14
Q

Air artifact on MRI

A

Creates a shadowy, hazy area

15
Q

In phase / out of phase contrast

A

If something gets darker on out of phase, then it contains fat

This is what we use to differentiate myelolipomas as adrenal nodules on MRI!

16
Q

Where is the infarct on this MRI cardiac viability scan?

A