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Physics > Chapter 1 > Flashcards

Chapter 1 Flashcards

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1
Q

___: refers to 3 forces (motion, magnetism and charge) and states that if two of these are present, then the third is automatically induced.

A

Faraday’s Law of Electromagnetic Induction

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2
Q

What is Larmor?

A

governs precessional frequency

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3
Q

What is NMV?

A

balance between spin-up and spin-down nuclei

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4
Q

What is resonance?

A

when an object is exposed to an oscillating perturbation that has a frequency close to its own natural frequency of oscillation

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5
Q

How are atoms characterized? Choose all correct …

A
  • atomic number: the sum of the protons

* mass number: sum of the protons and the neutrons

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6
Q

What are the three types of motion within the atom? Choose all correct …

A
  • electrons spinning on their own axis
  • electrons orbiting the nucleus
  • nucleus itself spinning about its own axis
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7
Q

Concerning the Larmor equation, what is Wo?

A

precessional frequency

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8
Q

Concerning the Larmor equation, what is Bo?

A

magnetic field strength of the magnet

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9
Q

Concerning the Larmor equation, what is Iamda?

A

gyrometric ration

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10
Q

What are the two results of resonance? Choose all that apply.

A
  • NMV moves out of alignment with Bo

* magnetic moments move into phase with each other

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11
Q

Concerning T1 vs T2, what is T1 Recovery?

A

Recovery of 63% longitudinal magnetization. Aka: spin lattice.

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12
Q

Concerning T1 vs. T2, what is T2 Decay?

A

Results of 63% loss of transverse magnetization. Aka: spin spin

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13
Q

What is TR?

A

determines amount of T1

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14
Q

What is TE?

A

determines amount of T2

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15
Q

What is in phase?

A

Magnetic moments in the same place on the precessional path around Bo at any time. Aka coherent.

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16
Q

What is out of phase?

A

Not in the same place on the precessional path. Aka incoherent.

17
Q

Which of the following is the Larmor equation?

A

precessional freq = MF strength * gyromagnetic ratio

18
Q

TRUE of FALSE: An MRI active nucleus has even mass numbers and thus no net spin.

A

False

19
Q

What is the 1T gyrometric ratio of Hydrogen?

A

42.57 MHz

20
Q

What is the 1.5T gyrometric ratio of Hydrogen?

A

63.86 MHz

21
Q

What is the 3T gyrometric ratio of Hydrogen?

A

127.71 MHz

22
Q

What is the 0.5T gyrometric ratio of Hydrogen?

A

21.28 MHz

23
Q

What is T1 Recovery?

A

caused by nuclei giving up energy to surrounding environment or lattice

24
Q

What is T2 Decay?

A

magnetic fields of neighboring nuclei interacting with each other

25
Q

T or F: the static magnetic field is Bo

A

true

26
Q

T or F: The signal/voltage is only induced if there is coherent magnetization in the transverse plan that is in-phase

A

true

27
Q

T or F: The isotope of Hydrogen is protium

A

true

28
Q

T or F: high-energy nuclei align their magnetic moments in the anti-parallel direction are spin-down nuclei

A

true

Physics (15 decks)

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