Skip to main content  » Image Creation  How is the MRI image
created? This section explores slice selection, spatial encoding
and the FFT.  « Question list  Frequency Encoding Gradient
Answer this...  What does the frequency encoding gradient do?
It moves net magnetisations into the xy-plane.  It reads out the
MRI signal.  It causes a range of Larmor frequencies to exist.
INCORRECT. This is the action of a RF excitation pulse (a
magnetic field oscillating at the Larmor frequency).  Try again.
INCORRECT. The MRI signal has been oscillating away as soon as
the RF excitation pulse was applied. "Reading out" a signal is
simply a case of recording the voltage in an appropriately
placed receiver coil. With or without the frequency encoding
gradient, a signal can be recorded. However, the frequency
encoding gradient is applied during the recording of the MRI
signal. Why is a this? What does this accomplish?  Try again.
The frequency encoding magnetic field gradient effects a change
in the Larmor frequency in on