MRI physics chapter 2 Exam Questions and Answers Solved Correctly
1. inherent energy of the tissues
2. closeness of molecular tumbling rate to Larmor frequency
3. how closely spaced the molecules are - Answers What are the 3 things factors that determine T1 and
T2 relaxation/decay times of tissues
T1, T2, PD, Flow
Apparent diffusion coefficient (ADC). - Answers What are the intrinsic parameters-
TR
TE
Flip angle
TI
Turbo factor/echo train length
b value. - Answers What are the extrinsic parameters -
T1 recovery is spin lattice relaxation, longitudinal magnetization regrowth - Answers What is T1 recovery
-
Loss of transverse magnetization due to spin-spin interaction/relaxation - Answers What is T2 decay?
white / bright - Answers High signal intensity/hyper-intensity appears -
black / dark - Answers Low signal intensity / hypointensity appears -
The TR is less than the T1 and T2 relaxation times of a tissue - Answers What is steady state -
parameters are selected to make one contrast dominate over the other.
IE: more T1 vs T2 or more T2 vs T1 - Answers Define the term weighting -
TE ; this determines how much dephasing is allowed to occur before the signal is read - Answers What
extrinsic parameter controls T2 decay, and why ?
The TR determines the amount of longitudinal relaxation that occurs between the end of one RF
excitation pulse and application of the next. - Answers What extrinsic parameter controls T1 relaxation,
and why ?
Permanent, resistive, superconducting - Answers What are the three basic types of magnets used to
construct MRI scanners?
, superconducting - Answers What is the most common type of MRI magnet in use today
Ferromagnetic attraction / missile effect - Answers One of the most important safety concerns
associated with MRI is:
Permanent - Answers What type of magnet cannot be turned off?
In certain life threatening emergencies - Answers Under what circumstances should a superconducting
magnet be turned off?
The MRI technologist - Answers The person responsible for the safety of everyone in and around the
MRI environment is:
False - Answers All wheelchairs, IV poles, and gurney are allowed in the MRI room
Isidor Rabi - Answers Who was the first person to demonstrate a radio signal from the nucleus of an
atom?
Bloch and Purcell - Answers Which two physicists first won a Nobel Prize in Physics for their
development of nuclear induction?
1952 - Answers In what year did these two individuals win this prize?
Raymond Damadian - Answers Who is credited with the first human body image in 1977?
1985 - Answers In what year did MRI receive its FDA approval?
Bloch - Answers Who is considered to be the father of MRI with their development of the T1 and T2
equations?
Nuclear Magnetic Resonance - Answers One of the original names for the technology, NMR, stood for
what?
Chemicals, spectroscopy - Answers What were the early NMR machines used to study, and what was the
name of this technique?
Indomitable" - Answers Raymond Damadian's first human-sized machine, now in the Smithsonian, is
named:
Nuclear disasters at the time.
To prevent patients from thinking it was ionizing radiation - Answers What prompted the name change
from NMR to MRI prior to FDA approval?
Hydrogen - Answers Which of the following is the most abundant atom in the human body?
Magnet, computer, operating console - Answers What are the three main components of an MRI
machine?
1. inherent energy of the tissues
2. closeness of molecular tumbling rate to Larmor frequency
3. how closely spaced the molecules are - Answers What are the 3 things factors that determine T1 and
T2 relaxation/decay times of tissues
T1, T2, PD, Flow
Apparent diffusion coefficient (ADC). - Answers What are the intrinsic parameters-
TR
TE
Flip angle
TI
Turbo factor/echo train length
b value. - Answers What are the extrinsic parameters -
T1 recovery is spin lattice relaxation, longitudinal magnetization regrowth - Answers What is T1 recovery
-
Loss of transverse magnetization due to spin-spin interaction/relaxation - Answers What is T2 decay?
white / bright - Answers High signal intensity/hyper-intensity appears -
black / dark - Answers Low signal intensity / hypointensity appears -
The TR is less than the T1 and T2 relaxation times of a tissue - Answers What is steady state -
parameters are selected to make one contrast dominate over the other.
IE: more T1 vs T2 or more T2 vs T1 - Answers Define the term weighting -
TE ; this determines how much dephasing is allowed to occur before the signal is read - Answers What
extrinsic parameter controls T2 decay, and why ?
The TR determines the amount of longitudinal relaxation that occurs between the end of one RF
excitation pulse and application of the next. - Answers What extrinsic parameter controls T1 relaxation,
and why ?
Permanent, resistive, superconducting - Answers What are the three basic types of magnets used to
construct MRI scanners?
, superconducting - Answers What is the most common type of MRI magnet in use today
Ferromagnetic attraction / missile effect - Answers One of the most important safety concerns
associated with MRI is:
Permanent - Answers What type of magnet cannot be turned off?
In certain life threatening emergencies - Answers Under what circumstances should a superconducting
magnet be turned off?
The MRI technologist - Answers The person responsible for the safety of everyone in and around the
MRI environment is:
False - Answers All wheelchairs, IV poles, and gurney are allowed in the MRI room
Isidor Rabi - Answers Who was the first person to demonstrate a radio signal from the nucleus of an
atom?
Bloch and Purcell - Answers Which two physicists first won a Nobel Prize in Physics for their
development of nuclear induction?
1952 - Answers In what year did these two individuals win this prize?
Raymond Damadian - Answers Who is credited with the first human body image in 1977?
1985 - Answers In what year did MRI receive its FDA approval?
Bloch - Answers Who is considered to be the father of MRI with their development of the T1 and T2
equations?
Nuclear Magnetic Resonance - Answers One of the original names for the technology, NMR, stood for
what?
Chemicals, spectroscopy - Answers What were the early NMR machines used to study, and what was the
name of this technique?
Indomitable" - Answers Raymond Damadian's first human-sized machine, now in the Smithsonian, is
named:
Nuclear disasters at the time.
To prevent patients from thinking it was ionizing radiation - Answers What prompted the name change
from NMR to MRI prior to FDA approval?
Hydrogen - Answers Which of the following is the most abundant atom in the human body?
Magnet, computer, operating console - Answers What are the three main components of an MRI
machine?
