Unfortunately matlab is a bit weak when it comes to displaying volumetric data. You can use the slice function and use the alpha-parameters to modify the transparency. Something like this:
for iZ = nZ:-1:1
V(:,:,iZ) = Bcell{iZ}; % just to get all the images into a 3-D array
end
idx_X = [12 37]; % Just example slices
idx_Y = [13 29];
idx_Z = [2 7];
ph = slice(X,Y,Z,V,idx_X,idx_Y,idx_Z),shading flat
and then setting the alpha and face-alpha-properties of ph (I have had some success using this earlier, when toying with this today, not so fortunate).
There's also a number of submissions on the FEX:
image3, imshow3d, 4-dimensional-visualization, hypervolume-viewer, sliceomatic, 3d-volume-slicer, 4d-volume-visualization and 3d-volume-visualizationviewer3d (I have surely missed a few...).
HTH
