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MRI > Final > Flashcards

Final Flashcards

1
Q

Where do you place a spatial saturation band when scanning a 2D TOF MRA of the carotid arteries?
a. Superior to FOV to null venous flow
b. Over the throat to null swallowing/breathing motion
c. Inferior to FOV to null venous flow
d. Both inferior and superior to FOV to null venous flow.

A

A

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2
Q

What parameter is used in phase contrast MRA to image flow?
a. B-value
b. VENC
c. ETL/turbo factor
d. TOF

A

B

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3
Q

If you notice chemical shift affecting your image quality, how can you compensate?
a. Increase TE
b. Decrease receive bandwidth
c. Increase receive bandwidth
d. Change from a 1.5T machine to a 3T machine

A

C

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4
Q

What cools the coils of the solenoid electromagnet to make them superconductive?
a. Ice
b. Cryogen
c. Air
d. Water

A

B

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5
Q

What happens during a quench?
a. The gradient coil is ejected
b. The MRI machine is ramped up
c. Isocenter becomes more homogenous
d. The liquid helium is released from the cryostat

A

D

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6
Q

The fringe field must be contained to what limit?
a. 50T
b. 50G
c. 5G
d. 5 T

A

C

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7
Q

What is the purpose of the static field?
a. Spatial encoding
b. Excite hydrogen atoms
c. Detect signal
d. Nuclear alignment

A

D

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8
Q

What function(s) does (do) the gradient coils perform in the MRI system?

I. Spatial encoding

II. Rephase echoes in GRE

III. Transmit RF

a. I and III
b. I, II, and III
c. II and III
d. I and II

A

D

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9
Q

When using a receive only coil, what transmits the RF?
a.The transmit only coil
b.The solenoid
c.The body coil
d. The hydrogen atoms

A

C

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10
Q

Using an electromagnet to create a more homogenous field is ______.
a. Active shimming
b. Passive shimming
c. Passive shielding
d. Active shielding

A

A

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11
Q

Dotarem is a 0.5M agent. That means every 1ml of contrast contains 0.5mmols of gadolinium.

How much Dotarem contrast do you inject for a 100kg patient?

a. 10 ml
b. 15 ml
c. 5 ml
d. 20 ml

A

D

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12
Q

What is the recommended dose of Gadolinium contrast?
a. 10 milliliters per pound
b. 0.1 milliliters per kg
c. 0.1 millimoles per pound
d. 0.1 millimoles per kg

A

D

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13
Q

How do Gadolinium-based contrast agents (GBCA) work?
a. Shortening T1 times of nearby molecules
b. Absorb more RF compared to other molecules
c.Increasing the T2 times of nearby molecules
d. Increasing the SNR

A

A

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14
Q

What is the term used to describe how bright a GBCA will appear on an image?
a. Hypointensity
b. Hyperintensity
c. RF absorbivity
d Relaxivity

A

D

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15
Q

Compared to other medications GBCA have a high reaction rate.
True
False

A

F

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16
Q

GBCAs have been shown to be retained in tissues of patients with normal kidney function.
True
False

A

T

17
Q

What can a technologist use to estimate kidney function before injecting a GBCA?
a. eGFR
b. Multiphase Kidney Scans
c. Urine output
d. HCG

A

A

18
Q

Lining the scan room with steel plates to contain the fringe field is known as what?
a. Passive shielding
b. Active shimming
c. Passive shimming
d. Active shielding

A

A

19
Q

What is the purpose of the transmit coils?
a. Transmit RF
b. Transmit ionizing radiation
c. Transmit signal
d. Transmit magnetism

A

A

20
Q

Where does the signal come from that the receive coil detects?
a. The body coil
b. The NMV
c. The transceiver
d. The transmit coil

A

B

21
Q

Which MR zone are you currently sitting in? (Assuming you’re at your house)
a. Zone III
b. Zone I
c. Zone IV
d. Zone II

A

B

22
Q

‘MR compatible’ is a term to describe a device that can be safely scanned under certain conditions
True
False

A

F

23
Q

Who has the final determination of whether it is acceptable to scan a patient?
a. The ordering doctor
b. The Magnetic Resonance Safety Officer
c. The attending radiologist
d. The MRI technologist

A

C

24
Q

What safety considerations are associated with the static magnetic field?

I. Translational/torquing forces

II. Heating/burning

III. Acoustic noise

a. I and II
b. I and III
c. II only
d. I only

A

D

25
Q

What are the units for the spatial gradient magnetic field?
a. T/m/s
b. W/kg
c. G/cm
d. T/s

A

C

25
Q

What is the SAR limit for a Head in normal mode?
a. 4 (units of SAR)
b. 2 (units of SAR)
c. 8 (units of SAR)
d. 3.2 (units of SAR)

A

D

25
Q

What safety considerations are associated with time-varying RF?

I. Translational/torquing forces

II. Heating/burning

III. Acoustic noise

a. I and III
b. II only
c. I only
d. II and III

A

B

26
Q

What safety considerations are associated with time-varying gradient magnetic field?

I. Translational/torquing forces

II. Heating/burning

III. Acoustic noise

a. I only
b. III only
c. II only
d. II and III

A

B

MRI (5 decks)

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