# Mock 1.1

15 Questions

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• 1.
A pulse sequence is __________.
• A.

A series of RF and/or gradient pulse

• B.

Always on

• C.

The scan time

• D.

• 2.
Image contrast is primarily controlled by manipulating the time between __________.
• A.

• B.

RF pulses

• C.

• D.

There is no contrast parameter in the pulse sequence

• 3.
Tipping the NMV from a position along the Z axis, and into the transverse plane, is referred to as __________.
• A.

Applying a 45° pulse

• B.

Applying an inversion pulse

• C.

Applying a 90° RF pulse

• D.

Relaxation

• 4.
There are two main types of pulse sequences: __________.
• A.

Inversion recovery and echo planar

• B.

• C.

Fast spin echo and echo planar

• D.

Diffusion and perfusion

• 5.
Patients are placed in a strong magnetic field and proton spins align either with __________ or opposed __________ to the magnetic field
• A.

(low energy) / (high energy state)

• B.

(high energy state) / (low energy)

• C.

Quantum energy / reserve energy

• D.

Spin down / spin up

• 6.
In order to double the flip angle, (a) __________ in RF power is required.
• A.

No change

• B.

10% increase

• C.

2 fold increase

• D.

Four-fold increase

• 7.
As the NMV precesses through the xy plane, it will precess across a receiver coil oriented in the same plane. So in order to detect signal, __________.
• A.

The NVM must be along the longitudinal axis and in phase (also known as "non zero")

• B.

The NVM must be in the transverse plane and in phase (also known as "non zero")

• C.

The NVM must be in the along the longitudinal axis and out of phase (also known as "zero")

• D.

The NVM must be in the transverse plane and out of phase (also known as "zero")

• 8.
In MRI, as the NMV __________ passes by a RF coil __________, an MR signal will be induced in the coil
• A.

(a magnet) / (a conductive loop)

• B.

(a conductive loop) / (a magnet)

• C.

( a resistive magnet) / (a superconductive loop)

• D.

(a superconductive loop) / (a resistive magnet)

• 9.
The signal induced in a receiver coil immediately following an RF excitation pulse is known as the __________.
• A.

SAR or specific absorption rate

• B.

FRE or flow related enhancement

• C.

FID or Free Induction Decay

• D.

MIP or maximum intensity pixel

• 10.
After the RF pulse has been removed, the NMV shrinks because __________.
• A.

Spins enter the high energy state

• B.

Spins remain in the low energy state

• C.

Spins maintain phase coherence

• D.

Spins rapidly lose phase coherence

• 11.
At the same time, but independently, some of the spins in the __________ state release the energy gained from the RF pulse and return to the __________ state.
• A.

High energy / low energy

• B.

Low energy / high energy

• C.

High energy / high energy

• D.

Low energy / low energy

• 12.
A spin echo pulse sequence is acquired with the use of a __________ RF pulse.
• A.

90° followed by a 90°

• B.

180° followed by a 180°

• C.

90° followed by a 180°

• D.

45°

• 13.
The FID signal decays as the result of __________.
• A.

T1 recovery

• B.

T2 decay

• C.

Proton density

• D.

T2* decay

• 14.
In order to clean up the effects of inhomogeneities and susceptibility effects and evaluate T2 effects on MR images, __________ can be applied.
• A.

A 180° refocusing pulse.

• B.

• C.

A 90° pulse

• D.

Nothing

• 15.
In spin echo imaging, the RF refocusing pulse rephases MR signal to create a __________.
• A.

Inversion pulse

• B.