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Physics > KAHOOT > Flashcards

KAHOOT Flashcards

1
Q

Used for clinical setting purposes?

A. Hydrogen electron
B. Hydrogen proton
C. Helium electron
D. Helium proton

A

B. Hydrogen proton

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2
Q

Our current proton status (as we speak)…

A. Resonance
B. Precession
C. Relaxation
D. Randomization

A

D. Randomization

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3
Q

42.6 MHz?

A. Gyromagnetic ratio
B. Planck constant
C. Avogadro’s number
D. Faraday’s law

A

A. Gyromagnetic ratio

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4
Q

Which of the following magnets can be turned off at the end of the day?

A. Permanent
B. Resistive
C. Superconducting

A

B. Resistive

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5
Q

If a hospital loses power, a superconducting magnet will?

A. Lose field; not dangerous
B. Lose field; still dangerous
C. Not lose field; not dangerous
D. Not lose field; still dangerous

A

D. Not lose field; still dangerous

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6
Q

Which of the following field strengths has largest NMV?

A. 0.5T
B. 1.0T
C. 1.5T
D. 3T

A

D. 3T

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7
Q

Which of the following is NOT a name for main magnetic field?

A. B0
B. B1
C. Static magnetic field

A

B. B1

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8
Q

Which of the following occurs when a patient lies on scanning table?

A. Protons resonate at Larmor frequency
B. Protons precess at Larmor frequency
C. More protons align against B0 than with B0
D. Protons rotate in phase

A

B. Protons precess at Larmor frequency

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9
Q

What is precessional frequency of hydrogen at 0.5T?

A. 21.3 MHz
B. 42.6 MHz
C. 63.9 MHz
D. 85.2 MHz

A

A. 21.3 MHz

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10
Q

The Larmor Equation is used to determine?

A. Static field strength
B. Amount of RF deposition
C. Resonant frequency
D. All of these

A

C. Resonant frequency

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11
Q

Which of the following does NOT match the others?

A. 63% of NMV returned to B0
B. T2 decay
C. Longitudinal relaxation
D. Spin lattice relaxation

A

B. T2 decay

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12
Q

Which of the following does NOT match the others?

A. 37% of NMV remains in phase
B. T2 decay
C. Longitudinal magnetization
D. Spin spin relaxation

A

C. Longitudinal magnetization

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13
Q

Compared to X-rays, MRI has?

A. Long WL; low frequency
B. Short WL; low frequency
C. Long WL; high frequency
D. Short WL; high frequency

A

A. Long WL; low frequency

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14
Q

Which of the following receives signal from the patient?

A. Gradient coil
B. RF coil
C. Shim coil
D. Shielding coil

A

B. RF coil

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15
Q

The atomic number is the number of:

A. Neutrons
B. Protons
C. Electrons
D. Neutrons and protons

A

B. Protons

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16
Q

The mass number is the number of:

A. Neutrons
B. Protons
C. Electrons
D. Neutrons and protons

A

D. Neutrons and protons

17
Q

An isotope is the result of a charge in:

A. Neutrons
B. Protons
C. Electrons
D. Neutrons and protons

A

A. Neutrons

18
Q

An ion is the result of a change in:

A. Neutrons
B. Protons
C. Electrons
D. Neutrons and protons

A

C. Electrons

19
Q

Which of the following states that a magnetic field is created by movement of a charged particle?

A. Ohm’s law
B. Lenz’s law
C. Faraday’s Law of Induction
D. Lorentz Force Law

A

C. Faraday’s Law of Induction

20
Q

MR active nuclei are all examples of:

A. Ions
B. Isotopes
C. Noble gases
D. Alloys

A

B. Isotopes

21
Q

T1 relaxation may be known as which of the following:

A. T1 recovery
B. Spin spin relaxation
C. Proton density
D. T1 regrowth

A

A. T1 recovery

22
Q

T2 relaxation may be known as which of the following?

A. T2 recovery
B. Spin spin relaxation
C. Spine lattice relaxation
D. T2 diffusion

A

B. Spin spin relaxation

23
Q

T1 relaxation is the time it takes:

A. 63% loss of longitudinal magnetization
B. 37% loss of longitudinal magnetization
C. 63% loss of phase coherence
D. 37% loss of phase coherence

A

A. 63% loss of longitudinal magnetization

24
Q

T2 relaxation is the time it takes:

A. 63% loss of longitudinal magnetization
B. 37% loss of longitudinal magnetization
C. 63% loss of phase coherence
D. 37% loss of phase coherence

A

C. 63% loss of phase coherence

25
Q

TR stands for:

A. Recovery time
B. Time to repeat
C. Repetition time
D. Time to reverse

A

C. Repetition time

26
Q

TE stands for:

A. Entrance time
B. Echo time
C. Time to emit
D. Time to encounter

A

B. Echo time

27
Q

Which formula is used to determine precessional frequency?

A. Lenz’s law
B. Faraday’s equation
C. Ohm’s law
D. Larmor equation

A

D. Larmor equation

28
Q

T1 and T2 relaxation are independent processes

True or false?

29
Q

T1 and T2 relaxation are dependent upon each other

True or false?

30
Q

In which of the following compounds does hydrogen experience the shortest T1 relaxation time?

A. Fat
B. Water
C. CSF
D. Muscle

31
Q

In which of the following compounds does hydrogen experience the shortest T2 relaxation time?

A. Fat
B. Water
C. CSF
D. Muscle

32
Q

What is the contrast weighting of the following image: TR = 500 ms; TE = 20 ms

A. T1 contrast weighting
B. T2 contrast weighting
C. Proton density contrast weighting
D. Not enough info

A

A. T1 contrast weighting

33
Q

What is the contrast weighting of the following image: TR = 2000 ms; TE = 80 ms

A. T1 contrast weighting
B. T2 contrast weighting
C. Proton density contrast weighting
D. Not enough info

A

B. T2 contrast weighting

34
Q

What is the contrast weighting of the following image: TR = 2000 ms; TE = 20 ms

A. T1 contrast weighting
B. T2 contrast weighting
C. Proton density contrast weighting
D. Not enough info

A

C. Proton density contrast weighting

35
Q

RF energy deposited into the patient is controlled by the:

A. TE
B. FOV
C. Flip angle
D. Coherent magnetization

A

C. Flip angle

36
Q

The most commonly used isotope of hydrogen used in MRI is:

A. Protium
B. Deuterium
C. Tritium
D. None of these

A

A. Protium

Physics (6 decks)

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