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QUESTIONS
» Image Creation

How is the MRI image created? This section explores slice selection, spatial encoding and the FFT.

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K-Space Is...

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What is k-space?

K-space is where we store digitised MRI signal data.

K-space is an infinite plot of complex wave numbers.

K-space is a matrix of spatial frequencies.


Digitisation of a single MRI signal; one line of k-space. This must be repeated many times (with different phase encoding) to produce just one image. Digitised numbers are represented as greyscale values in this diagram.

CORRECT. K-space is where we store digitised MRI signal data.

Sometimes k-space is referred to as "raw data space" for this reason. If you see k-space as an image, remember that the grey-scale values of the image are simply representations of the numbers which were recorded when the MRI signals were digitised.

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CORRECT. K-space is an infinite plot of complex wave numbers.

Every point in k-space contributes to the signal intensity in every pixel in the corresponding image. Every point in k-space (a complex number) represents a spatial frequency.

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CORRECT. A spatial frequency is a wave in real space. Spatial frequencies are explained and depicted in detail in the What is K-Space? tutorial.

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Further reading on this topic:
Books: Q&A in MRI p89, MRI From Picture to Proton p52, MRI The Basics p146

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