MRI Questions with All Correct & 100% Verified Answers |
Actual Complete Exam| Already Graded A+
1. What are the two theories quantum physics as well as classical physics
used to describe the basic
principles of MRI?
2. What is the mass number and why Is the sum of the neutrons and protons in
the nucleus.
is it important in MRI? detemines the size of the magnetic moment
3. What conditions are necessary
oscillating perturbation that has a frequency close to
for resonance? its own natural frequency of oscillation
4. What is the difference
phase is the distance between the first zero-crossing
between phase and
and the point in space defined as the origin
frequency?
(degrees of ditt.) frequency is the change of
phase over distance
5. Why is hydrogen used in MRI
Used in clinical MRI because it contains a single proton
and not the other MRI active
nuclei? (atomic and mass number of 1).
It is used because of its abundance in the human body
and its solitary proton gives it a relatively large
magnetic moment.
6. Describe the three motions 1) Electrons spinning on their own axis
pre- sent within the atom. 2) Electrons orbiting around the nucleus
3) Nucleus spins on its own axis
7. What is the Larmor equation? ω = Bo X γ
8. What does the gyro-magnetic hydrogen?
ra- tio expresses and what is
the gyro-magnetic ratio of
1/
20
,MRI Questions with All Correct & 100% Verified Answers |
Actual Complete Exam| Already Graded A+
expresses the relationship between the angular
momen- tum and the magnetic moment of each
MR active nucle- us
The (γ)gyro-magnetic ratio of hydrogen = 42.57
2/
20
, MRI Questions with All Correct & 100% Verified Answers |
Actual Complete Exam| Already Graded A+
9. What is resonance? Resonance is an energy transition that occurs
when an object is subjected to a frequency the
same as its own
10. What is FID? induction of reduced signal is called the Free
Induction Decay signal (FID)
11. What is Relaxation? hydrogen give up their absorbed RF energy
and their NMV returns toB0.
Independently, but at the same time the magnetic
mo- ments of hydrogen lose coherency due to
dephasing.
12. What is T1 Recovery? Recovery of longitudinal magnetization due to
energy
dissipation to the surrounding lattice
It is the time it takes for 63% of the longitudinal
magne- tization to recover in the tissue.
13. What is T2 decay? Loss of coherent transverse magnetization due
to in- teractions between the magnetic fields of
neighbouring (adjacent) nuclei
14. Describe TR and TE. TR is the time from application of one RF pulse to
the application of the next RF pulse for each
slice and is measured in milliseconds
TE is the time from the application of the RF
pulse to the peak of the signal induced in the
coil and is also measured in milliseconds
15. What velocity has a paperclip have 40mph
at 1.5T?
16. What is SAR? Specific Absorption Rate, is a measure of the rate at
3/
20
Actual Complete Exam| Already Graded A+
1. What are the two theories quantum physics as well as classical physics
used to describe the basic
principles of MRI?
2. What is the mass number and why Is the sum of the neutrons and protons in
the nucleus.
is it important in MRI? detemines the size of the magnetic moment
3. What conditions are necessary
oscillating perturbation that has a frequency close to
for resonance? its own natural frequency of oscillation
4. What is the difference
phase is the distance between the first zero-crossing
between phase and
and the point in space defined as the origin
frequency?
(degrees of ditt.) frequency is the change of
phase over distance
5. Why is hydrogen used in MRI
Used in clinical MRI because it contains a single proton
and not the other MRI active
nuclei? (atomic and mass number of 1).
It is used because of its abundance in the human body
and its solitary proton gives it a relatively large
magnetic moment.
6. Describe the three motions 1) Electrons spinning on their own axis
pre- sent within the atom. 2) Electrons orbiting around the nucleus
3) Nucleus spins on its own axis
7. What is the Larmor equation? ω = Bo X γ
8. What does the gyro-magnetic hydrogen?
ra- tio expresses and what is
the gyro-magnetic ratio of
1/
20
,MRI Questions with All Correct & 100% Verified Answers |
Actual Complete Exam| Already Graded A+
expresses the relationship between the angular
momen- tum and the magnetic moment of each
MR active nucle- us
The (γ)gyro-magnetic ratio of hydrogen = 42.57
2/
20
, MRI Questions with All Correct & 100% Verified Answers |
Actual Complete Exam| Already Graded A+
9. What is resonance? Resonance is an energy transition that occurs
when an object is subjected to a frequency the
same as its own
10. What is FID? induction of reduced signal is called the Free
Induction Decay signal (FID)
11. What is Relaxation? hydrogen give up their absorbed RF energy
and their NMV returns toB0.
Independently, but at the same time the magnetic
mo- ments of hydrogen lose coherency due to
dephasing.
12. What is T1 Recovery? Recovery of longitudinal magnetization due to
energy
dissipation to the surrounding lattice
It is the time it takes for 63% of the longitudinal
magne- tization to recover in the tissue.
13. What is T2 decay? Loss of coherent transverse magnetization due
to in- teractions between the magnetic fields of
neighbouring (adjacent) nuclei
14. Describe TR and TE. TR is the time from application of one RF pulse to
the application of the next RF pulse for each
slice and is measured in milliseconds
TE is the time from the application of the RF
pulse to the peak of the signal induced in the
coil and is also measured in milliseconds
15. What velocity has a paperclip have 40mph
at 1.5T?
16. What is SAR? Specific Absorption Rate, is a measure of the rate at
3/
20
