Sinus CT is a common method of clinical rhinology examination and is mainly used to examine diseases of the nasal cavity and sinuses, mainly nasal bone fracture, nasal septum deviation, inferior turbinate hypertrophy, nasal polyp, polyp in the posterior maxillary sinus, maxillary sinusitis, septal sinusitis, pterygoid sinusitis, frontal sinusitis, maxillary sinus cyst, pterygoid sinus cyst, frontal sinus cyst, nasal papilloma, maxillary sinus papilloma, nasopharyngeal fibrovascular tumor, nasopharyngeal carcinoma, septal sinus osteoma, and maxillary sinus cancer, etc. Sinus CT is especially sensitive to bone changes, and is very accurate in determining the fracture line of nasal bone, malignant tumor of nasal cavity and sinus, and the degree of bone destruction, and has a clear judgment on the size and specific location of nasal cavity and sinus tumor, which is an important basis for confirming the diagnosis of sinusitis and nasal polyps.