MRI in Practice Review Updated 2025
Questions and Answers Verified Solutions|
Graded A+
Terms in this set (249) EXAM QUISTIONS VERIFIED ANSWERS
1. There are essentially two ways of explaining the Classically and via quantum
fundamentals of MRI: physics
2. . All things are made of ____, including the atoms
human body.
3. The mass number or atomic weight is the sum of protons and neutrons
the ______ in the nucleus
4. MR active nuclei are characterized by their magnetic field
tendency to align their axis of rotation to an
applied:
5. MR active nuclei that have a net charge and are magnetic moment
spinning, automatically acquire a/an _____ and
can align with an external magnetic field.
6. The isotope of the hydrogen nucleus called _____ protium
, is the MR active nucleus used in clinical MRI.
7. ______ law of electromagnetic induction states Faraday's
that a magnetic field is created by a charged
moving particle that creates an electric field.
8. In the absence of an applied magnetic field, the randomly, no
magnetic moments of hydrogen nuclei are ______
orientated and produce ______ overall magnetic
effect.
9. Quantum theory uses the ______ of the spins (or energy level
hydrogen nuclei) to illustrate alignment.
10. Magnetic moments of hydrogen spins are Zeeman Interaction
constantly changing their orientation because, due
to __________, they are always moving between
high and low-energy states.
11. According to ______ law, there are about 6 x Avogrado's
1023 molecules per gram of tissue.
12. The precessional frequency is often called the Larmor
______ frequency.
13. The ______ expresses the relationship between gyromagnetic ratio
angular momentum and the magnetic moment of
each MR-active nucleus.
14. _____ is a phenomenon that occurs when an resonance
object is exposed to an oscillating perturbation
, that has frequency close to its own natural
frequency of oscillation.
15. Application of an RF pulse that causes resonance excitation
is termed:
16. The combination of development of phase nutation
coherence and _______ results in coherent
magnetization that precesses in the transverse
plane.
17. If just the right amount of energy is absorbed, the 90
NMV lies in the transverse plane at ______
degrees to B0.
18. The magnitude of the flip angle depends on the 1 & 2 only
______ of the RF excitation pulse.
1. amplitude
2. duration
3. phase
19. The emf is defined as the energy available from a loop of wire
unit of charge traveling once around a:
20. Voltage signal is produced when ___ coherent
magnetization cuts across a coil placed in the area
of a moving magnetic field.
21. The process by which hydrogen loses energy is relaxation
called:
, 22. A very simplified pulse sequence is a 4. all of the above
combination of RF:
1. pulses
2. signals
3. intervening periods of relaxation
4. all of the above
23. One of the main advantages of MRI compared to soft tissue
other imaging modalities is its excellent ______
discrimination.
24. Extrinsic contrast parameters include all except: flow
1. TR
2. Flip Angle
3. Value
4. Flow
25. The recovery of longitudinal magnetization is T1 Recovery
caused by a process termed:
26. The typical T1 recovery time of fat in brain tissue 200
at 1T is ____ ms.
27. T2 decay is caused by the magnetic fields of each other
neighboring hydrogen nuclei interacting with:
28. ______ are areas within the magnetic field that do inhomogeneties
not exactly match the external magnetic field
strength.
Questions and Answers Verified Solutions|
Graded A+
Terms in this set (249) EXAM QUISTIONS VERIFIED ANSWERS
1. There are essentially two ways of explaining the Classically and via quantum
fundamentals of MRI: physics
2. . All things are made of ____, including the atoms
human body.
3. The mass number or atomic weight is the sum of protons and neutrons
the ______ in the nucleus
4. MR active nuclei are characterized by their magnetic field
tendency to align their axis of rotation to an
applied:
5. MR active nuclei that have a net charge and are magnetic moment
spinning, automatically acquire a/an _____ and
can align with an external magnetic field.
6. The isotope of the hydrogen nucleus called _____ protium
, is the MR active nucleus used in clinical MRI.
7. ______ law of electromagnetic induction states Faraday's
that a magnetic field is created by a charged
moving particle that creates an electric field.
8. In the absence of an applied magnetic field, the randomly, no
magnetic moments of hydrogen nuclei are ______
orientated and produce ______ overall magnetic
effect.
9. Quantum theory uses the ______ of the spins (or energy level
hydrogen nuclei) to illustrate alignment.
10. Magnetic moments of hydrogen spins are Zeeman Interaction
constantly changing their orientation because, due
to __________, they are always moving between
high and low-energy states.
11. According to ______ law, there are about 6 x Avogrado's
1023 molecules per gram of tissue.
12. The precessional frequency is often called the Larmor
______ frequency.
13. The ______ expresses the relationship between gyromagnetic ratio
angular momentum and the magnetic moment of
each MR-active nucleus.
14. _____ is a phenomenon that occurs when an resonance
object is exposed to an oscillating perturbation
, that has frequency close to its own natural
frequency of oscillation.
15. Application of an RF pulse that causes resonance excitation
is termed:
16. The combination of development of phase nutation
coherence and _______ results in coherent
magnetization that precesses in the transverse
plane.
17. If just the right amount of energy is absorbed, the 90
NMV lies in the transverse plane at ______
degrees to B0.
18. The magnitude of the flip angle depends on the 1 & 2 only
______ of the RF excitation pulse.
1. amplitude
2. duration
3. phase
19. The emf is defined as the energy available from a loop of wire
unit of charge traveling once around a:
20. Voltage signal is produced when ___ coherent
magnetization cuts across a coil placed in the area
of a moving magnetic field.
21. The process by which hydrogen loses energy is relaxation
called:
, 22. A very simplified pulse sequence is a 4. all of the above
combination of RF:
1. pulses
2. signals
3. intervening periods of relaxation
4. all of the above
23. One of the main advantages of MRI compared to soft tissue
other imaging modalities is its excellent ______
discrimination.
24. Extrinsic contrast parameters include all except: flow
1. TR
2. Flip Angle
3. Value
4. Flow
25. The recovery of longitudinal magnetization is T1 Recovery
caused by a process termed:
26. The typical T1 recovery time of fat in brain tissue 200
at 1T is ____ ms.
27. T2 decay is caused by the magnetic fields of each other
neighboring hydrogen nuclei interacting with:
28. ______ are areas within the magnetic field that do inhomogeneties
not exactly match the external magnetic field
strength.
