For my project, I need to take FFT of MRI image and for that, I am planning to start with taking the FFT of a dipole corresponding to the sample. My question is, how to identify the dipole in the MRI image ?
I have the data in the form of a 3D array and using MATLAB for programming. My assumption is that first I need to convert this array into k-space matrix. Any suggestions ?
If you are going to take a FFT of an MRI image you produce a time-domain signal of the image. Dipoles in an FFT phase-encoded MRI have a particular triangular shape based on the direction of the frequency and phase encoding and how that is aligned along the main magnetic field. The attached paper by Xu, Balshchi and Springer show some nice dipole examples for phase-encoded MRI. This is a dipole induced by the bulk magnetic susceptibility of two substances in a phantom. This can also serve as an example of what happens in standard MRI where air/tissue interfaces occur and the shifts that are produced. If you need to produce a classic dipole pattern that only occurs in a all-frequency encoded images such as occurs using a projection reconstruction MRI method.
To answer your question, we need to know what kind of 3D images do you have (real or complex)? what pulse sequence you used for the images?
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