Hello voxey,
In a 3D DICOM image, the data is typically represented as a 3D matrix or volume.
As you mentioned, XY = V(:,:,160); extracts the 160th slice along the Z-axis. This is a 2D slice parallel to the XY plane.
To extract an XZ plane, you need to fix the Y-coordinate and vary X and Z. For example, if you want the XZ plane at a specific Y position (say, y = 100), you can extract it as:
XZ = V(100,:,:);
This will give you a 1xMxP matrix, which you might need to squeeze to get a typical 2D matrix:
XZ = squeeze(V(100,:,:));
Similarly, to extract a YZ plane, fix the X-coordinate and vary Y and Z. For example, for a specific X position (say, x = 50), you can extract it as:
YZ = V(:,50,:);
YZ = squeeze(V(:,50,:));
