ARMRIT LATEST EXAM SCRIPT ALL QUESTIONS AND
ANSWERS SURE A+
✔✔which type of MRI magnet has attainable field strengths of 0.35T to 3T for clinical
use in the USA and higher strengths elsewhere and in research?
A) superconductive
B) resistive
C) permanent - ✔✔superconductive
✔✔the process of relaxation begins when:
A) B0 is turned off
B) B1 is turned on
C) B1 is turned off
D) B0 is turned on - ✔✔B1 is turned off
✔✔a sinewave is a symbol used to measure electromagnetic energy. A sinewave's 2
components of measurement are:
A) transmit and receive
B) wavelength and frequency
C) stimulation and relaxation
D) gauss and tesla - ✔✔wavelength and frequency
✔✔magnetic fields have direction which are usually designated as north and south
therefore magnetic fields are described as:
A) vectors
B) dipoles
C) protons
D) axes - ✔✔dipoles
✔✔at any one time, human body tissue, in general, is made up of 50-90% of what
substance
A) c13
B) NA 23
C) H2O
D) H - ✔✔H
✔✔which of the following is the larmor equation?
A) B0 = y + Wo
B) B0 = y x Wo
C) y = B0 - Wo
D) Wo = y x B0 - ✔✔Wo = y x B0
✔✔the mechanism of T2 contrast enhancement agents is to
A) increase T2 relaxation time, therefore producing low signal
,B) decrease T2 relaxation time, therefore producing low singal
C) Increase T2 relaxation time, therefore producing high signal
D) decrease T2 relaxation time, therefore producing high signal - ✔✔Decrease T2
relaxation time, therefore producing low signal
✔✔which type of MRi magnet requires cryogen to cool magnetic coils to 4 degrees
kelvin?
A) superconductive
B) resistive
C) permanent - ✔✔superconductive
✔✔a time constant that characterizes the fast rate of transverse magnetization because
of the inhomogeneities of the main magnetic field is:
A) T2*
B) T1
C) TE
D) TR - ✔✔T2*
✔✔as the NMV precesses within the transverse plane, it induces an electrical curreny in
a:
A) gradient coil
B) shim coil
C) B0
D) radio frequency coil - ✔✔radio frequency coil
✔✔to symbolize the flow and area of a magnetic field, lines are used which are called:
A) gauss
B) axes
C) field or flux
D) vector - ✔✔field or flux
✔✔all chemical substances have an assigned constant known as the:
A) gyro magnetic ratio
B) larmor ratio
C) precessional ratio
D) angular momentum - ✔✔gyro magnetic ratio
✔✔mri systmes require rooms that provide specific shielding requirements. these rooms
are lined with what typer of material?
A) stainless steel or titanium
B) copper or galvanized steel
C) lead
D) iron oxide or neodymium - ✔✔copper or galvanized steel
,✔✔which type of MRI magnet requires no electricity to maintain its magnetic field and
can weigh from 18,000 to 200,000 lb.?
A) superconductive
B) resistive
C) permanent - ✔✔permanent
✔✔which type of electromagnetic coils are employed as a transmitter, receiver, or both?
A) gradient coils
B) radio frequency coils
C) shim coils - ✔✔radio frequency coils
✔✔which type of MRI magnet requires a special cooling system to dissipate heat
produced by very large currents?
A) superconductive
B) resistive
C) permanent - ✔✔resistive
✔✔tissues that are efficient in both T1 an T2 interactions have low (short) relaxation
times, and therefore have:
A) high T1 values
B) high relaxation rates
C) high T2 values
D) low relaxation rate - ✔✔high relaxation rates
✔✔because of only 10-15% variation in most tissues, the tissue characteristic that does
not provide much contrast resolution is:
A) T1 effects
B) T2 effects
C) hydrogen concentration
D) velocity effects - ✔✔hydrogen concentration
✔✔the tissue characteristics that is dependent on the strength of the main magnetic
field and temperature is:
A) T1 effects
B) T2 effects
C) hydrogen concentration
D) velocity effects - ✔✔T1 effects
✔✔the component Mz is most associated with:
A) anti-parallel to B0; T2 relaxation; net magnetization
B) transverse to B0; T2 relaxation; transverse magnetization
C) parallel to B0; T1 relaxation; longitudinal magnetization
D) perpendicular to B0; T2 decay; FID - ✔✔parallel to B0; T1 relaxation; longitudinal
magnetization
, ✔✔the component Mxy is most associated with:
A) anti-parallel to B0; T1 relaxation; net magnetization
B) transverse to B0; T2 relaxation; transverse magnetization
C) parallel to B0; T1 relaxation; longitudinal magnetization
D) perpendicular to B0; T2 decay; FID - ✔✔transverse to B0; T2 relaxation; transverse
magnetization
✔✔in the USA, MRI systems in clinical use have main magnetic field strengths that
range from:
A) 2T to 6T
B) 0.06T to 3T
C) 2 Gauss to 6 Gauss
D) 0.006T to 0.03T - ✔✔0.06T to 3T
✔✔On a very basic level, the 3 basic components required to attain MR signals are:
A) Magnetic field, proton, ionizing radiation
B) magnetic field, electron, ionizing radiation
C) magnetic field, electron, radio wave
D) magnetic field, proton, radio wave - ✔✔magnetic field, proton, radio wave
✔✔the main magnetic field of the MRI system is described as constant and always
oriented in one set direction, either horizontal or vertical (dependent on the type of
magnet). the transmitted radio frequency, in comparison, is described as:
A) constant and always parallel to B0
B) oscillating and always parallel to B0
C) constant and always perpendicular to B0
D) oscillating and always perpendicular to B0 - ✔✔oscillating and always perpendicular
to B0
✔✔which of the following parameters controls the amount of contrast seen in an image
due to T2 relaxation
A) T1
B) TE
C) TR
D) None of these - ✔✔TE
✔✔a magnetic field strength of 0.5T is equivalent to:
A) 1500 G
B) 5000 G
C) 1 G
D) 10000 G - ✔✔5000 G
✔✔an example of a dipole is:
ANSWERS SURE A+
✔✔which type of MRI magnet has attainable field strengths of 0.35T to 3T for clinical
use in the USA and higher strengths elsewhere and in research?
A) superconductive
B) resistive
C) permanent - ✔✔superconductive
✔✔the process of relaxation begins when:
A) B0 is turned off
B) B1 is turned on
C) B1 is turned off
D) B0 is turned on - ✔✔B1 is turned off
✔✔a sinewave is a symbol used to measure electromagnetic energy. A sinewave's 2
components of measurement are:
A) transmit and receive
B) wavelength and frequency
C) stimulation and relaxation
D) gauss and tesla - ✔✔wavelength and frequency
✔✔magnetic fields have direction which are usually designated as north and south
therefore magnetic fields are described as:
A) vectors
B) dipoles
C) protons
D) axes - ✔✔dipoles
✔✔at any one time, human body tissue, in general, is made up of 50-90% of what
substance
A) c13
B) NA 23
C) H2O
D) H - ✔✔H
✔✔which of the following is the larmor equation?
A) B0 = y + Wo
B) B0 = y x Wo
C) y = B0 - Wo
D) Wo = y x B0 - ✔✔Wo = y x B0
✔✔the mechanism of T2 contrast enhancement agents is to
A) increase T2 relaxation time, therefore producing low signal
,B) decrease T2 relaxation time, therefore producing low singal
C) Increase T2 relaxation time, therefore producing high signal
D) decrease T2 relaxation time, therefore producing high signal - ✔✔Decrease T2
relaxation time, therefore producing low signal
✔✔which type of MRi magnet requires cryogen to cool magnetic coils to 4 degrees
kelvin?
A) superconductive
B) resistive
C) permanent - ✔✔superconductive
✔✔a time constant that characterizes the fast rate of transverse magnetization because
of the inhomogeneities of the main magnetic field is:
A) T2*
B) T1
C) TE
D) TR - ✔✔T2*
✔✔as the NMV precesses within the transverse plane, it induces an electrical curreny in
a:
A) gradient coil
B) shim coil
C) B0
D) radio frequency coil - ✔✔radio frequency coil
✔✔to symbolize the flow and area of a magnetic field, lines are used which are called:
A) gauss
B) axes
C) field or flux
D) vector - ✔✔field or flux
✔✔all chemical substances have an assigned constant known as the:
A) gyro magnetic ratio
B) larmor ratio
C) precessional ratio
D) angular momentum - ✔✔gyro magnetic ratio
✔✔mri systmes require rooms that provide specific shielding requirements. these rooms
are lined with what typer of material?
A) stainless steel or titanium
B) copper or galvanized steel
C) lead
D) iron oxide or neodymium - ✔✔copper or galvanized steel
,✔✔which type of MRI magnet requires no electricity to maintain its magnetic field and
can weigh from 18,000 to 200,000 lb.?
A) superconductive
B) resistive
C) permanent - ✔✔permanent
✔✔which type of electromagnetic coils are employed as a transmitter, receiver, or both?
A) gradient coils
B) radio frequency coils
C) shim coils - ✔✔radio frequency coils
✔✔which type of MRI magnet requires a special cooling system to dissipate heat
produced by very large currents?
A) superconductive
B) resistive
C) permanent - ✔✔resistive
✔✔tissues that are efficient in both T1 an T2 interactions have low (short) relaxation
times, and therefore have:
A) high T1 values
B) high relaxation rates
C) high T2 values
D) low relaxation rate - ✔✔high relaxation rates
✔✔because of only 10-15% variation in most tissues, the tissue characteristic that does
not provide much contrast resolution is:
A) T1 effects
B) T2 effects
C) hydrogen concentration
D) velocity effects - ✔✔hydrogen concentration
✔✔the tissue characteristics that is dependent on the strength of the main magnetic
field and temperature is:
A) T1 effects
B) T2 effects
C) hydrogen concentration
D) velocity effects - ✔✔T1 effects
✔✔the component Mz is most associated with:
A) anti-parallel to B0; T2 relaxation; net magnetization
B) transverse to B0; T2 relaxation; transverse magnetization
C) parallel to B0; T1 relaxation; longitudinal magnetization
D) perpendicular to B0; T2 decay; FID - ✔✔parallel to B0; T1 relaxation; longitudinal
magnetization
, ✔✔the component Mxy is most associated with:
A) anti-parallel to B0; T1 relaxation; net magnetization
B) transverse to B0; T2 relaxation; transverse magnetization
C) parallel to B0; T1 relaxation; longitudinal magnetization
D) perpendicular to B0; T2 decay; FID - ✔✔transverse to B0; T2 relaxation; transverse
magnetization
✔✔in the USA, MRI systems in clinical use have main magnetic field strengths that
range from:
A) 2T to 6T
B) 0.06T to 3T
C) 2 Gauss to 6 Gauss
D) 0.006T to 0.03T - ✔✔0.06T to 3T
✔✔On a very basic level, the 3 basic components required to attain MR signals are:
A) Magnetic field, proton, ionizing radiation
B) magnetic field, electron, ionizing radiation
C) magnetic field, electron, radio wave
D) magnetic field, proton, radio wave - ✔✔magnetic field, proton, radio wave
✔✔the main magnetic field of the MRI system is described as constant and always
oriented in one set direction, either horizontal or vertical (dependent on the type of
magnet). the transmitted radio frequency, in comparison, is described as:
A) constant and always parallel to B0
B) oscillating and always parallel to B0
C) constant and always perpendicular to B0
D) oscillating and always perpendicular to B0 - ✔✔oscillating and always perpendicular
to B0
✔✔which of the following parameters controls the amount of contrast seen in an image
due to T2 relaxation
A) T1
B) TE
C) TR
D) None of these - ✔✔TE
✔✔a magnetic field strength of 0.5T is equivalent to:
A) 1500 G
B) 5000 G
C) 1 G
D) 10000 G - ✔✔5000 G
✔✔an example of a dipole is:
