检查MRI k空间中的共轭对称性

Question

I have a 2-D k-space data of size 256X256 . I learned that K-space data satisfies conjuage symmetry property s(-x) = s*(x) . How can I view this symmetry from k-space data using matlab. Though conjugate symmetry is not perfect due phase errors, I feel the magnitude part of complex numbers should be equal.

In matlab, I see matrix indexing is from 1 to 256. If I take 128 row as the central axis, there are 128 above central axis 127 below central axis. Then how I can associate matrix elements diagonally to check for conjugate symmetry?

Thanks.

Answer 1

我会尝试使用triu和tril（ http://fr.mathworks.com/help/matlab/ref/triu.html?refresh=true ）。