How to find pixels number of a 3D dataset

I have a 3D dataset D=260*320*100 of 100 slice. After segmentation I need to Know the total volume (found as total number of pixel) of the 3D dataset. I tried with this code, but I'm not able to find the total volume:

CCvol = bwconncomp(D(:,:,:), 8);
STATS = regionprops(CCvol, 'Area');
Volume=sum(STATS.Area)

Answer 1

[Image Analyst]

Assuming D is your binary image, and you want the volume of the true/white/1 voxels, you'd simply do this:

Volume = sum(D(:));  % Compute sum of all "true" voxels.