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10 Cards in this Set

  • Front
  • Back
What are the 3 things that are required to know where a signal is coming from
First of all, the desired slice must be selected
Then, spatial information is encoded along the rows
Finally, spatial information is encoded along the columns
How is decoding of the MR signal done
Decoding of spatial information, included in the NMR signal as modifications of frequency and phase, is performed by an inverse Fourier Transform
What is used to determine the location of a slice
slice selection gradient (GSS)
Which in each slice selection gradient what is done to further pinpoint where the signal is coming from
Within this volume, the position of each point will be encoded vertically and horizontally by applying a phase encoding gradient (GPE), and a frequency-encoding gradient (GFE).
What is spatial encoding referring to
slice selection gradient
phase encoding gradient
frequency encoding gradient
What gradient is usually done first
First of all, a slice selection gradient (GSS) is used to select the anatomical volume of interest
How are the 3 different gradients the same and different
The different gradients used to perform spatial localization have identical properties but are applied at distinct moments and in different directions.
What is an example of a gradient in the Z-axis
Slice selection gradient
What is an example of a gradient in the X-axis
Left to Right
What is an example of a gradient in the Y direction
anterior posterior (relative to axial image)