K Space
One bad value (outlier/artifact) in k space will appear as ____ in image space
Bands at a particular angle and spatial frequency
What analysis technique is used to transform between K-space and image space?
Fourier transform
Where in k space are the high frequency waves?
Outer edge are the high frequency parts of k space - Those areas change quickly - Gives you fine details and sharpens the image - Small structures whose size is on the same order as the voxel size (tissue boundaries)
Where in k space is the low frequency waves?
The center - Give you parts that change slowly - Provides contrast
How many samples of k space do you need based on the number of voxels?
The number of voxels is equal to the number of samples of k space Ex. to get a 32 x 32 image you need to sample 1024 point in k-space
How do you increase spatial resolution?
You sample more parts of k space
