how to load a variable in a loop

ROI_epi.mat contains the variable ROI, which I need to load within the loop. How can I do this?

D = dir('CC*/Rest/ROI_epi.mat')

for i = 1:length(D)

a = struct2cell(ROI);

y = a(9,:,:);

%Salience%

ACGl = y{31};

ACGr = y{32};

Insl = y{29};

Insr = y{30};

%DMN%

MOFl = y{25};

MOFr = y{26};

PCCl = y{35};

PCCr = y{36};

IPCl = y{61};

IPCr = y{62};

%CEN%

MFGl = y{7};

MFGr = y{8};

SPCl = y{59};

SPCr = y{60};

%Thal%

lThal = y{77};

rThal = y{78};

TS = horzcat(ACGl,ACGr,Insl,Insr,MOFl,MOFr,PCCl,PCCr,IPCl,IPCr,MFGl,MFGr,SPCl,SPCr,lThal,rThal);

TSd = detrend(TS);

save(['TSd_' num2str(i)])

end

Answer 1

[Stephen23]

D = dir('CC*/Rest/ROI_epi.mat');
for k = 1:numel(D)
    F = fullfile(D(k).folder,D(k).name);
    S = load(F);
    ROI = S.ROI;
    ...
end