1. A method comprising: positioning a two-dimensional imager at a relative position from a volumetric scanner,. wherein the volumetric scanner comprises a scanning head that is configured to rotate about a subject, wherein the subject is positioned within a scanning volume of the volumetric scanner, and wherein the two-dimensional imager is positioned outside of the scanning volume of the volumetric scanner; obtaining volumetric data representing both an internal and external structure of the subject using the volumetric scanner, wherein the scanning head is placed between the two-dimensional imager and the subject and blocks a view of the two-dimensional imager during a volumetric scan; obtaining two-dimensional facial image data of the subject using the two-dimensional imager when the scanning head clears the view of the two-dimensional imager; generating a three-dimensional facial profile of the subject based on the volumetric data by setting an opacity threshold of the volumetric data, wherein the three-dimensional facial profile of the subject has an opacity level higher than the opacity threshold; determining color values of the three-dimensional facial profile of the subject from the two-dimensional facial image data based on coordinate matching between the two-dimensional facial image data and the volumetric data, wherein the coordinate matching is performed based on the relative position of the two-dimensional imager from the volumetric scanner; mapping the color values of the two-dimensional facial image data to the three-dimensional facial profile of the subject; and generating combined image data comprising the two-dimensional facial image data and the volumetric data.