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TOOLS
» K-Space Tool

What happens in k-space? This tool allows you to choose changes to be made to a k-space data set. The result of these changes is seen and discussed.

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K-Space Tool: Random Noise

A significant amount of noise has been added to the k-space data. (Compare with the original data.) The stronger low spatial frequencies still determine the contrast in the image easily. Random noise in k-space simply produces random noise in the image.

im_randnoise k_randnoise

Choose from the list below alter k-space.

Alter k-space...

Introduction.
Apply a low pass filter—see only the contrast of the image.
Apply a high pass filter—see only the detail of the image.
Introduce random motion artefacts—cf coughing, swallowing, moving.
Introduce periodic motion artefacts—cf breathing, pulsatile flow.
Add random noise.
Add more random noise.
Create a large RF spike near centre of k-space.
Create a small RF spike near centre of k-space.
Create a large RF spike at the periphery of k-space.
Create a small RF spike at the periphery of k-space.
Reduce the scan percentage—miss out the top and bottom of k-space.
Acquire just over half of k-space—partial Fourier with three extra lines.
Remove every other k-space line—similar to how SENSE (sensitivity encoding) achieves accelerated data acquisition.

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revise, v. To go over (a subject already learnt) in preparation for an examination. (OED) [Latin re-, + visare, to visit again, look at again]

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TOOLS» K-Space Tool

K-Space Tool: Random Noise

TOOLS
» K-Space Tool