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These questions are concerned with k-space.

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Spatial Frequencies

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What are spatial frequencies?

Usual frequency = cycles / time (units: s-1 or Hz)
Spatial frequency = cycles / distance (units: m-1). It's a wave in real space.
Spatial frequency is introduced and depicted in the first k-space web tutorial.

Further reading on this topic:
Books: MRI The Basics p165, Q&A in MRI p95f
Online: e-MRI e-MRI

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(This page: http://www.revisemri.com/questions/kspace/spatial_frequencies)