CT examination of the nose is usually done in cross-sectional and coronal scans, sagittal plane can be reconstructed at a later stage, cross-sectional scanning can let the patient take the supine position, with the canthus line as the body surface marking, to determine the scanning scope and level of the lateral image of the skull, and routinely do continuous scanning with a layer thickness of 5mm and spacing, and sometimes, in order to show the small lesions, you can do a thin layer scanning of the key areas of 2-3mm. Coronal scanning is also usually done with the patient in the supine position, with the neck hyperextended and the head tilted down and back, trying to make the canthus line parallel to the table surface, and the level perpendicular to the canthus line or parallel to the posterior wall of the maxillary sinus, and consecutive scans are done with a layer thickness of 5 mm and a spacing of 5 mm.