K-Space (Basic)

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Go to first k-space Q&A

Basic k-space Q&A's

• What is k-space?
• If the points in k-space don't correspond to points in the image, what do they mean?  
• What does the letter "k" stand for?
• What do you mean by spatial frequency? 
• Exactly where are the spatial frequencies are located in k-space?  
• Where do you get the data to fill k-space?
• I don't understand how you can simply plug the digitized MR signal data directly into k-space. How are these points the same as spatial frequency? 
• What is spin-warp imaging? Isn't this just "regular" MRI?  
• Why does k-space have a big spot in the middle?  
• You alluded to different trajectories for filling k-space. What are they?
• Why would you want to use a radial  k-space sampling method? ​  ​

Basic k-space Topics

BLADE
Cartesian trajectory (1), (2)
Dephase lobe
Fast Fourier Transformation (FFT)
Golden Angle
GRASP
​Gridding
JET
Multi-Vane
Phase-encoding gradient
​PROPELLER

RADAR
Radial trajectory
Readout lobe
​Spatial frequency (1), (2), (3)
Spin-warp imaging
Spiral trajectory
Stack of Stars
StarVIBE
Wavenumber (k)
Zig-zag trajectory