In-room imaging and MR planning

What is k-space?

• ‘k’ is wave-number: number of cycles per unit distance ➢ Spatial analogue to ‘cycles per second’ (frequency) • k-space is the raw data ➢ An array of numbers whose FT is the MR image • 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

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