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MRI CAMRT Review > MRI In Practice: Chapter 2 Image Weighting and Contrast > Flashcards

MRI In Practice: Chapter 2 Image Weighting and Contrast Flashcards

1
Q

Which of the following is not an intrinsic contrast parameter?

a. T1 recovery time
b. flow
c. T2 recovery time
d. TE

A

d. TE

Intrinsic contrast parameters can not be changed

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2
Q

Which of the following is not an extrinsic contrast parameter?

a. TR
b. apparent diffusion coefficient (ADC)
c. b value
d. flip angle

A

b. apparent diffusion coefficient (ADC)

Extrinsic contrast parameters can be changed by the technologist

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3
Q

T1 and T2 relaxation depends on:

a. the inherent energy of the tissue
b. how closely packed the molecules are
c. how well the molecular tumbling rate matches the larmor frequency of hydrogen.
d. all of the above

A

d. all of the above

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4
Q

T1 relaxation and T2 decay represent the time it takes for ___ % of the total magnetization to be regained in the longitudinal plane via spin lattice energy transfer (T1), or lost in the transverse plane via spin – spin interactions (T2).

a. 37%
b. 63%
c. 42.57%
d. 63.86%

A

b. 63%

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5
Q

The T1 time of fat is _____ and the T1 time of water is ______.

a. short, short
b. short, long
c. long, short
d. long, long

A

b. short, long

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6
Q

The T2 time of fat is _____ and the T2 time for water is _____.

a. short, short
b. short, long
c. long, short
d. long, long

A

b. short, long

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7
Q

On a T1 contrast image how does fat appear? How does water appear?

a. bright, bright
b. bright, dark
c. dark, dark
d. dark, bright

A

b. bright, dark

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8
Q

On a T2 contrast image how does fat appear? How does water appear?

a. bright, bright
b. bright, dark
c. dark, dark
d. dark, bright

A

d. dark, bright

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9
Q

Proton density weighted images are weighted by looking at

a. areas of high proton density and low proton density
b. areas of high T1 values and low T1 values
c. areas of low T2 values and low T1 values
d. dense proton clusters present

A

a. areas of high proton density and low proton density

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10
Q

For a T1 weighted image you want a

a. long TR, short TE
b. long TR, long TE
c. short TR, short TE
d. short TR, long TE

A

b. Long TR, short TE

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11
Q

In order to rephase magnetic moments

a. a 180° rephasing pulse is applied
b. a gradient is applied
c. either a or b
d. None of the above

A

c. either a 180 pulse is applied or gradient is used

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12
Q

What is TAU time

a. 1/2 TE
b. 1/2 TR
c. 2 TE
d. 2 TR

A

TAU is the time taken to de-phase after the 90° pulse is withdrawn and is equal to 1/2 TE

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13
Q

For Proton density weighted images how to high PD structures appear? How do low PD structures appear?

a. bright, dark
b. dark, dark
c. bright, bright
d. dark, dark

A

a. bright, dark

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14
Q

As field strength increases tissues take

a. The same amount of time to relax
b. a shorter time to relax
c. a longer time to relax
d. No time to relax

A

a. a longer time to relax

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15
Q

To produce a high signal in which plane must there be a large component of coherent magnetization?

a. lateral plane
b. longitudinal plane
c. transverse plane
d. ipsilateral plane

A

c. transverse plane

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16
Q

To produce a low signal in which plane must there be a small component of coherent magnetization?

a. lateral plane
b. longitudinal plane
c. transverse plane
d. ipsilateral plane

A

c. transverse plane

17
Q

Choosing a short TE

a. minimizes T2
b. maximizes T2
c. minimizes T1
d. maximizes T1

A

a. minimizes T2

18
Q

Choosing a short TR

a. minimizes T2
b. maximizes T2
c. minimizes T1
d. maximizes T1

A

d. maximizes T1

19
Q

What type of scan uses a gradient to rephase the magnetic moments?

a. Fast Spin Echo sequence
b. Inversion Recovery sequence
c. Gradient Echo sequence
d. Spin Echo sequence

A

c. Gradient Echo sequence

20
Q

True or false: Gradients eliminate effects from magnetic field inhomogeneities

A

False. Gradients DO NOT eliminate effects from magnetic field inhomogeneities

21
Q

What is a typical value for a long TR?

a. > 2000 ms
b. 300-700 ms
c. > 60 ms
d. 10- 25 ms

A

a. > 2000ms

22
Q

What is a typical value for a short TR?

a. > 2000 ms
b. 300-700 ms
c. > 60 ms
d. 10- 25 ms

A

b. 300-700 ms

23
Q

What is a typical value for a short TE?

a. > 2000 ms
b. 300-700 ms
c. > 60 ms
d. 10- 25 ms

A

d. 10 - 25 ms

24
Q

What is a typical value for a long TE

a. > 2000 ms
b. 300-700 ms
c. > 60 ms
d. 10- 25 ms

25
Q

What type of pulse sequence has T2* dephasing?

a. FSE
b. IR FSE
c. FS FSE
d. GRE

26
Q

What type of recovery is the T1 time and T2 time?

A

T1 time= longitudinal recovery

T2 time= transverse decay

MRI CAMRT Review (12 decks)

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