Free MRI Physics Questions and Answers

Question 1

When a constant magnetic field is present, hydrogen protons

Accepted Answer

Stay basically orientated randomly while rotating around the field axis.

Answer

do not experience any magnetic field effects

Answer

Align yourself along the field and revolve around its center.

Answer

Ascend the field and rotate around its center.

Question 2

Magnetization of hydrogen using MRI

Accepted Answer

perpendicular to the primary magnetic field

Answer

In the primary magnetic field path

Question 3

Following an RF burst, protons will

Accepted Answer

Dephase in accordance with T2*, then recover in accordance with T1 along B0.

Answer

As per T2*, recover along B0, and thereafter dephase in accordance with T1.

Answer

As per T2*, dephase in accordance with T1 and then recover along B0.

Answer

As instructed by T1, recover along B0, and then dephase as instructed by T2*.

Question 4

What differentiates T2 from T2* is

Accepted Answer

The combination of changing molecular magnetic field inhomogeneity and static magnetic field inhomogeneity is represented by T2*, which equals T2.

Answer

The combination of changing molecular magnetic field inhomogeneity and static magnetic field inhomogeneity is represented by T2*, or T2*.

Answer

The combination of changing molecular magnetic field inhomogeneity and static magnetic field inhomogeneity, or T2*, is represented by T2.

Answer

T2* is the product of changing molecular magnetic field inhomogeneity and static magnetic field inhomogeneity, which is represented by T2.

Question 5

One forms a spin echo through

Accepted Answer

changing the path of a proton using a radiofrequency pulse

Answer

Using a gradient of a negative magnetic field

Answer

Turning B0 in the opposite direction

Question 6

Spin echo sequence is modified by rapid spin echo sequence by

Accepted Answer

Adding 180-degree pulses in succession

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Gradient additions for spoilers

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Adding repeated pulses of 90 degrees

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progressively adding gradients encoded with frequencies

Question 7

Fast spin echo sequences, in contrast to spin echo, have

Accepted Answer

T2 weighting increased but susceptibility decreased

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T2 weighting decreased but susceptibility rose

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Diminished susceptibility and T2 weighting

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elevated susceptibility and elevated T2 weighting

Question 8

In contrast to the spin echo sequence (SE), the gradient echo sequence (GRE)

Accepted Answer

has T2* dephasing and lacks a 180-degree pulse.

Answer

has a T2 dephasing pattern and no 180-degree pulse.

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possesses a 180-degree pulse and T2 dephasing

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possesses a 180-degree pulse and T2* dephasing.

Question 9

In contrast to SE, GRE sequences employ

Accepted Answer

reduced TR and TE lengths

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shorter TE and longer TR

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greater TE and TR lengths

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longer TE and shorter TR

Question 10

Traditional GRE order

Accepted Answer

Reduce the impact of residual transverse magnetization by using spoiler gradients.

Answer

Maintain transverse magnetization for additional attempts

Answer

To lessen the impact of residual transverse magnetization, use long TR.