How to do interpolate mri image in App Desginer?

I have 256 dicom images in size 256x256.

I want to interpolate them but I don't know how many slices do i need for it.

I made 510 size of z axes using interp3 function and same size of x, y axes using resized function . I have no ideas...

%read dicom files

% inpertolate z axes to 510
[X, Y, Z] = meshgrid(1:256, 1:256, 1:256);
[Xq, Yq, Zq] = meshgrid(1:256, 1:256, 1:0.5:256);
app.interpImages = interp3(X, Y, Z, app.images, Xq, Yq, Zq, 'linear');

% make x, y axes to 510
app.resizedImages = zeros(510, 510, 510);
for i = 1:510
    app.resizedImages(:, :, i) = imresize(app.interpImages(:, :, i), [510, 510]);
end

[Rik]

Your problem is not related to AppDesigner.

What exactly do you want to have happen? Do you want to resample 256x256x256 to 510x510x510?