1. A method for anatomic construction of voxels, comprising: providing a structural image of a region of interest; constructing an anatomic system of voxels, for the region of interest, in which voxel boundaries are aligned with boundaries of structural objects of the region of interest, based on the structural image; performing radioactive-emission imaging of the region of interest, utilizing the anatomic system of voxels; performing reconstruction of the radioactive-emission imaging, utilizing the anatomic system of voxels; and fitting the boundaries of the structural objects to parametric equations and utilizing the parametric equations in the constructing of the anatomic system of voxels.