Do patients with pulmonary embolism need CT?

Pulmonary embolism is a serious disease in clinic, which is caused by thrombus blocking pulmonary artery. The main method to diagnose this disease is pulmonary artery CT angiography. Although some small artery embolism, this method of examination may be missed, but in most cases, this method of examination can diagnose pulmonary embolism. In addition, although ordinary chest CT is not helpful for the diagnosis of pulmonary embolism in many cases, it sometimes has certain suggestive significance for this disease. For example, sometimes pulmonary embolism can be manifested as local sparse pulmonary texture on ordinary chest CT, and if pulmonary embolism is combined with pulmonary infarction, it will also be displayed on chest CT.