how can i convert Dicom directory (series of dicom images) to 3D volume image??

i have almost 80 dicom images in a folder now i want to convert these series of dicom images to a 3d volume.below is the code which loads mri data forms counter slices and then generates 3d volume. But it loads inbuilt mri images.how can i change this program to load dicom images from my folder and display 3d volume??

load mri
D = squeeze(D);
%figure
colormap(map)
image_num = 8;
image(D(:,:,image_num))
axis image
x = xlim;
y = ylim;
cm = brighten(jet(length(map)),-.5);
figure
colormap(cm)
contourslice(D,[],[],image_num)
axis ij
xlim(x)
ylim(y)
daspect([1,1,1])
figure
colormap(cm)
contourslice(D,[],[],[1,12,19,27],8);
view(3);
axis tight
figure
colormap(map)
Ds = smooth3(D);
hiso = patch(isosurface(Ds,5),...
   'FaceColor',[1,.75,.65],...
   'EdgeColor','none');
   isonormals(Ds,hiso)
hcap = patch(isocaps(D,5),...
   'FaceColor','interp',...
   'EdgeColor','none');
view(35,30) 
axis tight 
daspect([1,1,.4])
lightangle(45,30);
lighting gouraud
hcap.AmbientStrength = 0.6;
hiso.SpecularColorReflectance = 0;
hiso.SpecularExponent = 50;