EPI sequences such as perfusion, diffusion, and BOLD
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increase the TVMF effects
What shape are gradient pulses?
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Trapezoidal waveforms
Name the 3 gradient fields used in MRI?
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X, Y, and Z
How much can ear plugs reduce noise?
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10-20dB
Direct cardiac stimulation is more difficult to achieve due to:
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- the central location of the heart
- smaller induction paths around the organ
- greater current densities necessary for cardiac muscle contraction
Factors responsible for inducing a physiologic response to an induced voltage:
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1. Strength of the static magnetic field
2. Orientation of the gradient magnetic field
3. Orientation of the gradient magnetic fields relative to the patient's tissues
4. Size of the patients body
5. Frequency of the stimulus
6. Duration of the induced voltage
7. Shape of the waveform, width of the pulse
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increase the TVMF effects
What shape are gradient pulses?
Give this one a try later!
Trapezoidal waveforms
Name the 3 gradient fields used in MRI?
, Give this one a try later!
X, Y, and Z
How much can ear plugs reduce noise?
Give this one a try later!
10-20dB
Direct cardiac stimulation is more difficult to achieve due to:
Give this one a try later!
- the central location of the heart
- smaller induction paths around the organ
- greater current densities necessary for cardiac muscle contraction
Factors responsible for inducing a physiologic response to an induced voltage:
Give this one a try later!
1. Strength of the static magnetic field
2. Orientation of the gradient magnetic field
3. Orientation of the gradient magnetic fields relative to the patient's tissues
4. Size of the patients body
5. Frequency of the stimulus
6. Duration of the induced voltage
7. Shape of the waveform, width of the pulse
