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mchiew / grappa-tools

MATLAB toolkit for GRAPPA and Slice GRAPPA reconstruction
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grappa_gfactor #3

Open tiwwexx opened 1 day ago

tiwwexx commented 1 day ago

The scaling is a little off when calculating the g-factor. Line 84 is W = ifftdim(W,3:5)*sqrt(Mx*My*Mz); when it should be W = ifftdim(W,3:5)*(Mx*My*Mz);

And Line 87 likewise needs the scale factor data = shiftdim(ifftdim(data,2:4),-1)*(Mx*My*Mz);

tiwwexx commented 1 day ago

Also, in line 96 g = reshape(sqrt(abs(W)./abs(p)), [Mx,My,Mz])/prod(R); Should be normalized by the root of the reduction factor g = reshape(sqrt(abs(W)./abs(p)), [Mx,My,Mz])/sqrt(prod(R));