how to stack 3D images from 2D images after semantic function.

Hi all, I have 2D images. then I used semantic program that have network build from U-Net deep learning.

after I segment the volume, I wrote this coding below to view as 3D stack the binary images. but only first images appear. Anyone can help me?

filePattern = fullfile('C:\Users\Akmal\Desktop\I-131 256 28.02.2020\I-131 SPECT NEMA VALIDATION 01112019 256X256\testimages', '*.png');
IMDS = imageDatastore(filePattern);
fileList = dir(filePattern)
numFiles = length(fileList);
image3d = zeros(256, 256, numFiles, 'uint8');

for k = 16 : 35
    fullFileName = fullfile(fileList(k).folder, fileList(k).name);
    thisImage = imread(fullFileName);
    image3d(:, :, k) = thisImage;
    
end

[C,scores] = semanticseg((image3d(:, :, k)),net1);

outt2=C=="foreground";
st2=strel('disk',0);
outt22=imopen(outt2,st2);
imshow3D(  outt22);

Answer 1

[yanqi liu]

please use size(outt2) to check the dim

Answer 2

[Sulaymon Eshkabilov]

There is a small err in the code. Here is the corrected part of it:

for k = 1:numFiles  % Starts at 1
    fullFileName = fullfile(fileList(k).folder, fileList(k).name);
    thisImage = imread(fullFileName);
    image3d(:, :, k) = thisImage;   
end

[mohd akmal masud]

that is not I mean