1. An imaging device, comprising: an optical source; an x-y scanner receiving light from the optical source and directing the light onto a sample; a detector receiving reflected light from the scanner; and a computer receiving a signal from the detector and providing a 3D data set containing voxels with a given voxel resolution of a sample, the computer further executing instructions for defining a first column and a second column of voxels within the 3D data set, adjacent to each other and extending along a selected direction of the 3D data set; defining a step size along the selected direction in the 3D data set; summing the voxels in the first and the second column along the selected direction in the 3D data set, alternating between voxels of the first and the second column for each step size along the selected direction of the 3D data set, to obtain values; and composing a 2D image using the values.