Questions tagged [mri]

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Why do we not encode frequency in 3 dimensions in MRI?

If I understand correctly, to select a particular slice (of an object, during an MRI scan) that is orthogonal to the direction of the main magnetic field applied, we apply a magnetic field that varies ...
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How to detect slices with circular crops in volumetric mri data

Ive got some MRI volumetric data I am trying to do some image analysis on. Ive got an issue right now where the first and last 2-4 slices of the data are cropped circularly. Here is an example of what ...
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How to calculate the echo magnitude of an hanh echo using bloch simulation?

Stanford provided all basic functions/M-files needed for Bloch simulation. The following MATLAB code snippet was made on top of these M-files to simulate the Hanh Echo: ...
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Will the phase of the reconstructed data using a single MRI k-space point show any curvature?

Some courses tell that each point in k-space (spatial-frequency domain) represents a certain stripe pattern in spatial domain. Reference: https://www.sciencedirect.com/science/article/pii/...
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Machine learning for denoising MRI images

I'm currently a sophomore in college and pretty new to the field of research. I'm currently working on an existing algorithm for MRI de-noising and the results are nothing that great. I can't see how ...
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From Fourier (k space) to wavelet domain in MRI sensing

In compressed sensing MRI (cSENSE MRI) technology the idea seems to entail sampling from the Fourier domain (k space) in a way that, when transformed to the wavelet domain ("sparsification"), the ...
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144 views

Bloch equations in MRI rotating field

I am trying to understand the workings of an MRI scanner and wanted to figure out how to simulate it by solving Bloch equations in the rotating frame of reference. I have a small query regarding the ...
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109 views

reconstruction of MRI signal

I have written a small simulator where I am trying to simulate the MRI signal generation process. I have a SINC RF Pulse to excite the spins and a readout gradient and k-space sampling during the ...
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phase evolution of MRI signal during RF excitation

I am trying to compute the phase evolution of a proton spin in the presence of a slice selection gradient. I have the following properties for the slice selection gradient and the RF excitation: <...