MRI

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MRI

An active nucleus has

2 points

Protons = Neutrons

Protons > Neutrons

Protons < Neutrons

B & C

Clear selection

Radio-waves used in MRI have _______ wavelength in comparison to x-rays

2 points

Shorter

Longer

Similar

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T1 is always _______ in comparison to T2. T2 is always _______ in comparison to T2*

2 points

Longer, longer

Longer, shorter

Shorter, longer

Shorter, shorter

Longer, similar

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Immediately after the 180 RF pulse, the spins are

2 points

Reversed and phased

Phased but not reversed

Reversed but not phased

Not reversed nor phased

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_____ is the main influencer of T1. _____ is the main influencer of T2

2 points

TR, TE

TE, TR

TE for both

TR for both

TR & TE for both

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The slice selection gradient is _______ to the imaged slice plane

2 points

Parallel

Tangential

45 degrees

Perpendicular

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What primarily determines the image view (axial, coronal, sagittal...etc)?

2 points

RF pulse

Frequency encoding gradient

Phase encoding gradient

Slice selection gradient

B & C

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After applying the frequency encoding gradient, rotating spins have

2 points

Same frequency and phase

Same frequency only

Same phase only

Different frequency and phase

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Thinner slices in MRI will ________ imaging time

2 points

Increase

Decrease

Not affect

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All of the following will increase SNR, EXCEPT

2 points

Increase magnet strength

Increase TR

Increase TE

Increase slice thickness

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In general, using a surface coil will ______ SNR, and using a parallel coil will ______ SNR

2 points

Increase, increase

Decrease, decrease

Increase, decrease

Decrease, increase

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Spin echo sequences utilize 2 _______ gradients at the 180 RF pulse

2 points

Slice selection

Frequency encoding

Phase encoding

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GRE sequences utilizes 2 _______ gradients at the 180 RF pulse

2 points

Slice selection

Frequency encoding

Phase encoding

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Diffusion sequences utilize ________ gradients

2 points

4 frequency encoding

6 frequency encoding

3 frequecy + 2 phase encoding

4 phase encoding

6 phase encoding

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In-and-out of phase imaging utilizes ______ GRE. SSFP imaging utilizes ______ GRE

2 points

Spoiled, coherent

Coherent, spoiled

Both spoiled

Both coherent

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Which MRI artifact is reduced when we increase field strength?

2 points

Motion

Truncation

Cross talk

Chemical shift

Magic angle

Susceptibility

Crisscross

Clear selection

Which MRI artifact does not occur in 3D MRI ?

2 points

Motion

Truncation

Cross talk

Chemical shift

Magic angle

Susceptibility

Crisscross

Clear selection

Long TE will ______ susceptibility artifact and ______ magic angle artifact

2 points

Increase, increase

Decrease, decrease

Increase, decrease

Decrease, increase

Clear selection

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