Podcast
Questions and Answers
True or false: Gradients in MRI alter the magnetic field strength in an unpredictable way?
True or false: Gradients in MRI alter the magnetic field strength in an unpredictable way?
False (B)
True or false: The field strength at magnetic isocentre remains unchanged when the gradient is switched on?
True or false: The field strength at magnetic isocentre remains unchanged when the gradient is switched on?
True (A)
True or false: Larger gradient coil currents create shallower gradients?
True or false: Larger gradient coil currents create shallower gradients?
False (B)
True or false: The polarity of the gradient is determined by the direction of the current flowing through the coil?
True or false: The polarity of the gradient is determined by the direction of the current flowing through the coil?
True or false: The maximum achievable resolution in MRI is determined by the amplitude of the gradient?
True or false: The maximum achievable resolution in MRI is determined by the amplitude of the gradient?
True or false: The slope of the gradient signifies the rate of change of the magnetic field strength along its length?
True or false: The slope of the gradient signifies the rate of change of the magnetic field strength along its length?
True or false: The magnitude of the change in field strength depends only on the strength of the gradient?
True or false: The magnitude of the change in field strength depends only on the strength of the gradient?
True or false: Larger gradient coil currents create steeper gradients, resulting in a greater change in field strength over distance?
True or false: Larger gradient coil currents create steeper gradients, resulting in a greater change in field strength over distance?
True or false: The polarity of the gradient coil determines which end of the gradient produces a higher field strength than isocentre?
True or false: The polarity of the gradient coil determines which end of the gradient produces a higher field strength than isocentre?
True or false: The direction of the current flowing through the coil determines the polarity of the gradient?
True or false: The direction of the current flowing through the coil determines the polarity of the gradient?
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Study Notes
Gradients in MRI
- Gradients in MRI alter the magnetic field strength in a predictable way.
- The field strength at the magnetic isocentre remains unchanged when the gradient is switched on.
- Larger gradient coil currents create steeper gradients, resulting in a greater change in field strength over distance.
- The polarity of the gradient is determined by the direction of the current flowing through the coil.
- The maximum achievable resolution in MRI is not determined by the amplitude of the gradient.
- The slope of the gradient signifies the rate of change of the magnetic field strength along its length.
- The magnitude of the change in field strength does not only depend on the strength of the gradient.
- The polarity of the gradient coil determines which end of the gradient produces a higher field strength than isocentre.
- The direction of the current flowing through the coil determines the polarity of the gradient.
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