Sinusitis or should do CT: 1, CT’s resolution is relatively high, can observe bone and soft tissue separately, can confirm the nature of the lesion according to the CT slice of the various tissues of different densities. 2, CT can also realize the three-plane scan, that is to say, can be the sinus and nasal cavity from the front and rear direction, horizontal direction, left and right direction to observe, so that the specific part of the sinusitis, there is a three-dimensional perception. CT can realize three-dimensional reconstruction, that is to say, it can outline the lesions in three dimensions, which is very helpful for guiding the surgery. 4, CT can realize enhanced scanning, that is to say, it can be scanned after intravenous injection of medication, which can differentiate the nature of the lesions in the nasal cavity and the sinuses, which the above points of X-ray film does not have, so that sinusitis should be scanned with CT.