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Diploma MR Quiz on Practice Set (2) - Basic Principles, created by S L on 09/01/2016.

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Practice Set (2) - Basic Principles

Question 1 of 64

1

With the exception of hydrogen, all matter is composed of three components.
They are

Select one of the following:

  • Electrons, Photons, Protons

  • Electrons, Neutrons, Photons

  • Protons, Neutrons, Photons

  • Neutrons, Electrons, Protons

Explanation

Question 2 of 64

1

The negatively charged component of an atom is called the

Select one of the following:

  • Electron

  • Proton

  • Negatron

  • Neutron

Explanation

Question 3 of 64

1

The positively charged component of an atom is called the

Select one of the following:

  • Electron

  • Proton

  • Positron

  • Neutron

Explanation

Question 4 of 64

1

The neutral component of an atom is called the

Select one of the following:

  • Electron

  • Proton

  • Neutron

  • Photon

Explanation

Question 5 of 64

1

The nucleus of the hydrogen atom is made up of one

Select one of the following:

  • Neutron

  • Electron

  • Photon

  • Proton

Explanation

Question 6 of 64

1

Materials reach their highest magnetic potential when their atoms are grouped in areas known as

Select one of the following:

  • Regions

  • Fields

  • Fringes

  • Domains

Explanation

Question 7 of 64

1

Material that is weakly attracted to a magnetic field is said to be

Select one of the following:

  • Electromagnetic

  • Paramagnetic

  • Ferromagnetic

  • Diamagnetic

Explanation

Question 8 of 64

1

Material that is strongly attracted to a magnetic field is said to be

Select one of the following:

  • Electromagnetic

  • Paramagnetic

  • Ferromagnetic

  • Diamagnetic

Explanation

Question 9 of 64

1

Material that is slightly repelled from a magnetic field is said to be

Select one of the following:

  • Resistive

  • Paramagnetic

  • Ferromagnetic

  • Diamagnetic

Explanation

Question 10 of 64

1

Three types offerromagnetic material are

Select one of the following:

  • Copper, Titanium, Aluminum

  • Iron, Cobalt, Nickel

  • Bronze, Niobium, Tin

  • None of the above

Explanation

Question 11 of 64

1

To exist, magnets must have two poles, therefore they are commonly called

Select one of the following:

  • Vectors

  • Dipoles

  • Axis

  • A and C

Explanation

Question 12 of 64

1

The lines that represent the field of a magnet are known as

Select one of the following:

  • Flux lines

  • Intensity lines

  • Induction lines

  • Faraday lines

Explanation

Question 13 of 64

1

The strength of a magnet is measured by its

Select one of the following:

  • Signal intensity

  • Induction ability

  • Flux density

  • None of the above

Explanation

Question 14 of 64

1

The strength of an MRI magnet is most commonly represented by a unit of
measurement called

Select one of the following:

  • Amps

  • Kilogauss

  • Tesla

  • Ohms

Explanation

Question 15 of 64

1

10,000 gauss is equal to

Select one of the following:

  • 1.0 amp

  • 1.0 ohm

  • 1.0 tesla

  • 10 tesla

Explanation

Question 16 of 64

1

15,000 gauss is equal to

Select one of the following:

  • 1.5 amps

  • 1.5 ohms

  • 1.5 tesla

  • 15 tesla

Explanation

Question 17 of 64

1

The law that is used in MRI to describe how a magnetic field is induced by
flowing current is known as

Select one of the following:

  • Damadian's Law

  • Murphy's Law

  • Newton's Law

  • Faraday's Law

Explanation

Question 18 of 64

1

Which of the following is an advantage of a permanent magnet MRI
system?

Select one of the following:

  • Very heavy

  • Low operating costs

  • Fixed field strength

Explanation

Question 19 of 64

1

What type of molecule makes up 500/0 to 90% of a person's total body
weight?

Select one of the following:

  • Fat

  • Oxygen

  • Water

  • Nitrogen

Explanation

Question 20 of 64

1

Clinical MRl is based on the generation of signal from the nucleus of which
atom?

Select one of the following:

  • Helium

  • Nitrogen

  • Oxygen

  • Hydrogen

Explanation

Question 21 of 64

1

The nucleus of the hydrogen atom carries what type of charge?

Select one of the following:

  • Negative

  • Positive

  • Neutral

Explanation

Question 22 of 64

1

The spin of the proton of the hydrogen atom is known as

Select one of the following:

  • Nuclear spin

  • Axial momentum

  • Hydraulic spin

  • Angular momentum

Explanation

Question 23 of 64

1

Because the nucleus of the hydrogen atom acts much like a bar magnet it is
said to have a

Select one of the following:

  • Magnetic ratio

  • Magnetic moment

  • Larmor ratio

  • Frequency ratio

Explanation

Question 24 of 64

1

Because the spinning nucleus of the hydrogen atom has both a North and
South pole it is commonly called a

Select one of the following:

  • Electromagnet

  • Bar magnet

  • Dipole

Explanation

Question 25 of 64

1

When placed in an external magnetic field, hydrogen nuclei

Select one of the following:

  • Resonate

  • Become excited

  • Become aligned

  • Repel each other

Explanation

Question 26 of 64

1

After being placed in an external magnetic field, high energy hydrogen nuclei
point in which direction?

Select one of the following:

  • Parallel

  • Anti-paired

  • Anti-parallel

  • Perpendicular

Explanation

Question 27 of 64

1

After being placed in an external magnetic field, low energy hydrogen nuclei
point in which direction?

Select one of the following:

  • Parallel

  • Anti-paired

  • Anti-parallel

  • Perpendicular

Explanation

Question 28 of 64

1

When placed in an external magnetic field, the hydrogen nuclei that are of
clinical interest are

Select one of the following:

  • Parallel paired

  • Anti-parallel paired

  • Parallel unpaired

  • Perpendicular paired

Explanation

Question 29 of 64

1

When a patient is placed in an external magnetic field, the number of
unmatched hydrogen protons usually equals

Select one of the following:

  • One billion

  • One million

  • Few per million

  • Few per billion

Explanation

Question 30 of 64

1

The sum of all of the unmatched parallel protons in an external magnetic field
makes up what is called the

Select one of the following:

  • External magnetization

  • Internal magnetization

  • Resonant magnetization

  • Net magnetic vector

Explanation

Question 31 of 64

1

The type of rotation that is displayed by hydrogen nuclei in an external
magnetic field is known as

Select one of the following:

  • Magnetization

  • Relaxation

  • Precession

  • Resonance

Explanation

Question 32 of 64

1

Within a perfect magnetic field all protons rotate at

Select one of the following:

  • Different frequencies

  • The same frequency

  • Undetermined frequencies

  • None of the above

Explanation

Question 33 of 64

1

The speed at which protons rotate in an external magnetic field is known as

Select one of the following:

  • Precessional frequency

  • Hydromagnetic frequency

  • External magnetic frequency

  • None of the above

Explanation

Question 34 of 64

1

The ratio that describes the constant at which any magnetic nucleus will
precess in a 1 tesla magnet is known as

Select one of the following:

  • Precessional ratio

  • Magnetogyric ratio

  • Gyromagnetic ratio

  • Both B and C

Explanation

Question 35 of 64

1

The precessional frequency of magnetic nuclei is determined by which of the
following?

Select one of the following:

  • The strength of the external magnetic field

  • The magnetogyric frequency

  • The gyromagnetic ratio of the specific nuclei

  • Both A and C

Explanation

Question 36 of 64

1

The equation that is used to determine the precessional frequency of magnetic
nuclei is known as

Select one of the following:

  • Faraday's equation

  • Fast Fourier transformations

  • Damadian's equation

  • Larmor equation

Explanation

Question 37 of 64

1

The stronger the magnetic field the ________ the precessional frequency

Select one of the following:

  • Stronger

  • Higher

  • Longer

  • Shorter

Explanation

Question 38 of 64

1

Which of the following is the equation that is used to determine precessional
frequencies?

Select one of the following:

  • Wo=yBo

  • Bo=yWo

  • F= yBo

  • A and C

Explanation

Question 39 of 64

1

Alignment of the net magnetic vector in the direction of the external
magnetic field is known as

Select one of the following:

  • Transverse magnetization

  • Longitudinal magnetization

  • Equilibrium

  • B and C

Explanation

Question 40 of 64

1

Magnetization in the XY plane is known as

Select one of the following:

  • Equilibrium

  • Longitudinal magnetization

  • Transverse magnetization

  • Spin-Lattice magnetization

Explanation

Question 41 of 64

1

When the proper radio frequency is applied, the precessing hydrogen nuclei
begin to

Select one of the following:

  • Dephase

  • Rephase

  • Relax

  • Resonate

Explanation

Question 42 of 64

1

The RF pulse used to move nuclei into a higher energy state is at a frequency
known as

Select one of the following:

  • Resonance frequency

  • Fourier frequency

  • Transverse frequency

  • None of the above

Explanation

Question 43 of 64

1

Hydrogen nuclei begin to precess in phase when which of the following
occurs?

Select one of the following:

  • The proper RF is turned off

  • The patient is placed into the external magnet

  • The proper RF is turned on

  • None of the above

Explanation

Question 44 of 64

1

When the radio frequency is turned off, precessing nuclei begin to

Select one of the following:

  • Relax

  • Lose energy

  • Dephase

  • All of the above

Explanation

Question 45 of 64

1

Another name for transverse relaxation is

Select one of the following:

  • Spin-lattice relaxation

  • T1 relaxation

  • Spin-Spin relaxation

  • Longitudinal relaxation

Explanation

Question 46 of 64

1

Another name for Tl relaxation is

Select one of the following:

  • Dephasing

  • Longitudinal relaxation

  • Spin-Spin relaxation

  • Transverse relaxation

Explanation

Question 47 of 64

1

The return of longitudinal magnetization to equilibrium is known as

Select one of the following:

  • T1 relaxation

  • Spin-Lattice relaxation

  • Longitudinal relaxation

  • All of the above

Explanation

Question 48 of 64

1

Dephasing of the net vector in the transverse plane is known as

Select one of the following:

  • T1 relaxation

  • Spin-Lattice relaxation

  • Longitudinal relaxation

  • Spin-Spin relaxation

Explanation

Question 49 of 64

1

The time it takes for a tissue's bulk longitudinal magnetization to return to
63% of its original value is known as

Select one of the following:

  • T1 relaxation time

  • T2 relaxation time

  • T2* relaxation time

  • None of the Above

Explanation

Question 50 of 64

1

The time it takes for transverse magnetization to decay to 37% of its original
value is known as

Select one of the following:

  • T1 relaxation time

  • T2 relaxation time

  • T2* relaxation time

Explanation

Question 51 of 64

1

Dephasing ofthe net vector in the transverse plane is caused by two factors, imperfections in the external magnetic field and

Select one of the following:

  • The application of the 180 degree RF pulse

  • The application of a 90 degree RF pulse

  • Interaction between surrounding nuclei

  • None of the above

Explanation

Question 52 of 64

1

Magnetization in the transverse plane can also be known as

Select one of the following:

  • Mz

  • Mxy

  • M0

  • Both B and C

Explanation

Question 53 of 64

1

Magnetization in the longitudinal plane can also be known as

Select one of the following:

  • Mz

  • Equilibrium

  • Mxy

  • A and B

Explanation

Question 54 of 64

1

MRI signals can only be detected in which ofthe following planes

Select one of the following:

  • Z plane

  • XY plane

  • Transverse plane

  • B and C

Explanation

Question 55 of 64

1

~~ The signal created after applying a 90 degree RF pulse is known as a

Select one of the following:

  • Gradient echo signal

  • Spin echo

  • Spin spin signal

  • Fill signal

Explanation

Question 56 of 64

1

The signal produced after the 180 degree RF pulse is applied is known as a

Select one of the following:

  • Gradient echo signal

  • Spin echo signal

  • Spin spin signal

  • Fill signal

Explanation

Question 57 of 64

1

A 180 degree RF pulse is used to ________ the dephasing net vector in the transverse plane

Select one of the following:

  • Magnetize

  • Decay

  • Delay

  • Refocus

Explanation

Question 58 of 64

1

The larger the net magnetic vector in the transverse plane the _______  the signal that is produced

Select one of the following:

  • Smaller

  • Stronger

  • Weaker

  • None of the above

Explanation

Question 59 of 64

1

The smaller the net magnetic vector in the transverse plane the signal that is produced

Select one of the following:

  • Larger

  • Stronger

  • Weaker

  • None of the above

Explanation

Question 60 of 64

1

The letters FID in an Fill signal stand for

Select one of the following:

  • Field image dimensions

  • Free induction decay

  • Field induction direction

  • Free image direction

Explanation

Question 61 of 64

1

The type of signal that is created after a gradient is used to refocus the dephasing net vector is known as

Select one of the following:

  • Spin echo signal

  • Gradient echo signal

  • Fill signal

  • None of the above

Explanation

Question 62 of 64

1

The time between two successive 90 degree RF pulses is known as

Select one of the following:

  • Echo time

  • Repetition time

  • Inversion time

  • Relaxation time

Explanation

Question 63 of 64

1

The time between the 90 degree RF pulse and the spin echo signal in a spin echo pulse sequence is known as

Select one of the following:

  • Echo time

  • Repetition time

  • Inversion time

  • Relaxation time

Explanation

Question 64 of 64

1

In an inversion recovery pulse sequence, the time between the 180 degree RF pulse and the 90 degree RF pulse is known as

Select one of the following:

  • Echo time

  • Repetition time

  • Inversion time

  • Relaxation time

Explanation

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