As in other anatomical regions, to generate three-dimensional (3D) reconstructions of the middle ear structures, a volumetric acquisition is required. In the case of the tympanic cavity, high-resolution computed tomography (HRCT) is the imaging modality of choice; although the term “high-resolution” is traditionally applied to acquisitions performed with millimetric or sub-millimetric collimation (even with conventional CT), volumetric study is more properly used when single-slice or multislice spiral CT is used. CT is generally introduced into the diagnostic investigation of middle ear pathologies when external otoendoscopy is unsuccessful at demonstrating the cause of the disease. Volumetric acquisitions allow the evaluation of most of the components of the tympanic cavity, such as the walls and ossicular chain, but fail to demonstrate the mucosal layer and ligaments.