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What is k-space?
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‘k’ is wave-number: number of cycles per unit
distance
Spatial analogue to ‘cycles per second’ (frequency)
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k-space is the raw data
An array of numbers whose FT is the MR image
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Each row in k-space corresponds to the echo data
obtained from a single application of the PE gradient
Rows near centre correspond to low-order PE steps (small
gradients)
Rows at edges correspond to high-order steps