Comments (6)
I can recreate this issue. Is this due to the center line of kspace being omitted? I think in general you want to include the center of kspace.
Try:
# R=3
kspace[0::3, ...] = 0
kspace[2::3, ...] = 0
Using the above I get the following:
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yes, I got the same result as you. Thank you for the hint.
But why vcgrappa is so sensitive to the center line? I don't remember the paper mentioned about it...
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I can't say why it's so sensitive, that's an interesting result. Do you know of any other reference VC-GRAPPA implementations that we could test against? Might also be worth attempting the experiment on real data, simulated data is not always representative of how algorithms perform on real datasets.
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I will try more data later. thanks again.
There could be some other solution, i.e. generating calib data away from center. But it seems another topic than virtual coil.
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Related to #72
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I tested it with real data, and it worked. But the improvement is not always significant as mentioned in the paper.
This issue is closed as I have no idea how to evaluate it further. Anyway, it can be traced by the new one #72
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Related Issues (20)
- ndarray is not C-contiguous error, when using grog and switching the coil axis HOT 3
- Build problem on M2 Mac with Meson 1.3.2 HOT 1
- API references missing cgrappa
- cgrappa breaks on 7T real data
- CI error for python 3.5
- ENH: multidimensional data support for cgsense
- ValueError when using complex64 with cgrappa HOT 10
- ENH: revamp cgrappa HOT 1
- ERROR when installing pygrappa in a singularity image HOT 7
- Precision on the kernel size HOT 13
- igrappa doesn't return coil dimension
- Regularly undersampled GRAPPA HOT 1
- Aliasing artifacts HOT 4
- BUG: radialgrappaop should use lamda0, not lamda
- Slow performance of mdgrappa HOT 7
- skimage.util.pad not available HOT 2
- Keeping calibration weights for reuse? HOT 5
- Defination of kernel sizes not agree with most papers HOT 2
- Local utils package cannot be imported properly HOT 3
- Memory Allocation HOT 2
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