Computed tomography versus magnetic resonance imaging and three-dimensional applications

An attempt has been made to simplify and to provide an understanding of some of the new modalities for evaluation of head and neck pathology. Both CT and MRI are complementary to each other: MRI being superior to CT in evaluating soft tissue, and CT being superior to MRI in assessing fine bony details and in identifying microcalcifications. MRI is the modality of choice for tumor evaluation because it has several advantages over CT in assessing the location, spread, and staging of the disease. HRCT scanning remains the procedure of choice in the evaluation of middle ear and base of the skull, and in the evaluation of benign sinonasal disease. CPA and IAC lesions are best evaluated by MRI. Three-dimensional surface reformations of axial CT scans enable the surgeon to plan the operative approach needed to reduce facial fractures and to repair cranial deformities.