MRI Imaging: operation on kspace matrix - operate a diagonal symmetry

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Hi, I am a full beginner in Matlab use and I have to process MRI imaging from a Kspace raw data matrix. I succeed so far to obained a picture and to operate simple change on the matrix (zero filling) but now I have to operate "diagonal symmetry" of the matrix. Despite looking in the help or in the net, I can't find anything matching to my beginner eyes.
Here is the question and the description of the operation to be done:
"5. To avoid the image errors in task 4 one samples more than half of k-space. In that way one does not miss the important signals around the centre. Furthermore one does not use the so called “zero-filling”. Instead one uses the (diagonal) symmetry of k-space and mirrors the sampled signals to the other half of k-space that has not been sampled. Test this. How does the MR image look like? How much can you speed up your scan time and still have a relevant MR image to look at (i.e. how many k-space lines can one skip to sample)?" Task 4 was 0 filling.
I have found that this operation was also named: "Phase Correction Conjugate Synthesis method" – Use central rows of k-space for phase correction of acquired k-space data – Use symmetry to get complete k-space. But not how to perform it...
I am just looking for the command to operate the symmetry, not the answer to the question!
thanks for your help!
  1 Comment
Anju George
Anju George on 19 Oct 2013
hai..i am a beginner in mri image processing and MATLAB,i want to know that how you got k space data from image?Are you retrieve it from DICOM image format?kindly add the code that you have been used.

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Answers (1)

Diego Teruo Mendes de Souza
I'm trying do the same thing you've done in our program, but i haven't been successful in it. Would you please show me your code, to i can see why i'm not being albe to reconstruct the image. Please, do not let me without answer. Bye!

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