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demo_myESP_SENSEmap.m
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demo_myESP_SENSEmap.m
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% demo for ESPIRIT SENSE recon
% The kspace dimension is assumed to be like this:
% kspace: complex images with the dimensions (sx,sy,sc,sz,t/w)
% -sx: matrix size in x-axis
% -sy: matrix size in y-axis
% -sc: coil array number
% -sz: slice number (short axis view); slice group (long axis view)
% -t/w: time frame/weighting
% output: img_sense
%% load data
dataPath = '/Users/apple/Seafile/TempData/Cardiac/RawData/ChallengeData/MultiCoil/Cine/ValidationSet/AccFactor04/P002/cine_lax.mat';
load(dataPath); % load raw kspace data
kspace = kspace_sub04; % please check the "ChallengeDataFormat" folder for name description
%% set parameters
ncalib = 24;
kspace_sub = kspace;
[sx,sy,scc,sz,nPhase] = size(kspace_sub);
kspace_cal = zeros(sx,ncalib,scc,sz,nPhase);
isDisplay = 0;
nIterCG = 12;
%% generate calibration data
for ind2 = 1:nPhase
kspace_calib = crop(kspace_sub(:,:,:,:,1),sx,ncalib,scc,sz);
kspace_cal(:,:,:,:,ind2) = kspace_calib;
end
%% SENSE recon
img_sense = zeros(sx,sy,sz,nPhase);
kspace_sense = zeros(sx,sy,scc,sz,nPhase);
% perform sense recon
for ind1 = 1:sz
for ind2 = 1:nPhase
% ESPIRiT CG reconstruction with 1 map (SNS is the sensitivity map you need!)
SNS = myESP_SENSEmap(double(kspace_sub(:,:,:,ind1,ind2)),kspace_cal(:,:,:,ind1,ind2),isDisplay);
[kspace_sense(:,:,:,ind1,ind2), img_sense(:,:,ind1,ind2)] = cgESPIRiT(double(kspace_sub(:,:,:,ind1,ind2)), SNS, nIterCG,0.01 ,double(kspace_sub(:,:,:,ind1,ind2))*0);
end
disp(strcat(num2str(ind1),'/',num2str(sz)," completed!"));
end
if isDisplay == 1
figure,imshow(abs(img_sense(:,:,1,1)),[0,0.001]); % reconstructed image
end