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Crib sheet nucs, safety and physics > MRI physics stuff > Flashcards

MRI physics stuff Flashcards

1
Q

Gadapentate = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Magnavist
Ionic
Linear

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2
Q

Gadobenate = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Multihance
Ionic
Linear

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3
Q

Gadoxetate = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Eovist
Ionic
Linear

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4
Q

Gadodiamide = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Omniscan
Nonionic
Linear

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5
Q

Gadoteridol = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Prohance
nonionic
macrocyclic

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6
Q

Gadobutrol = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Gadovist
Nonionic
Macrocyclic

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7
Q

Gadoterate = ?
Ionic or non-ionic?
Linear or macrocyclic?

A

Dotarem
nonionic
macrocyclic

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8
Q

Nephrogenic systemic sclerosis (NSF) is only associated with which gadolinium based contrast media?

A

A few linear contrast media including:
Magnevist
Omniscan
Optimark

MOO

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9
Q

For 2D MRI, table time is equal to what?

A

2D Table time = TR * Phase matrix * NEX

Where,

TR = Time between each RF pulse

NEX = Number of times each set of encoding steps is repeated per TR

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10
Q

3D MRI table time is equal to?

A

3D Table time = TR * Phase matrix * NEX * # of slices

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11
Q

FSE time = ?

A

FSE time = 1/(echo train length)

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12
Q

What are 4 things that improve MRI spatial resolution?

A
  • Small voxel
  • Small FOV
  • Larger matrix
  • Thinner slices ( Thin transmit bandwidth/Steep slice select gradient)
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13
Q

What are 9 things that improve SNR in MRI?

A
  1. Stronger magnet
  2. Long TR
  3. Big FOV
  4. Larger slices (wide transmit bandwidth/shallow slice select gradient)
  5. more NEX
  6. Short TE
  7. Small matrix
  8. Small receiver bandwidth
  9. appropriate coil size
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14
Q

What is the primary determinant of noise in MRI?

A

Receiver bandwidth

Increase RB –> increase noise –> decrease SNR

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15
Q

What is SAR?

A

Specific absorption rate: ability to heat patient with RF pulse energy

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16
Q

What is the formula for SAR?

A

SAR = B02 * Alpha2 * duty cycle

  • B0 is magnet strength
  • Alpha is the flip angle
  • duty cycle is tissue cooldown time via TR (TR increased by 2x will decrease SAR by ½)
17
Q

What are the annual QC items for MRI?

A

Slice position and thickness accuracy

RF coil check

Display monitor check

Magnetic field homogeneity

18
Q

How are spatial resolution and SNR related?

A

Inversely

Crib sheet nucs, safety and physics (2 decks)

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