CT examinations performed during the follow-up of patients after lung cancer resection can in most cases monitor signs of recurrence before the patient exhibits clinical signs of recurrence. This helps physicians to establish the diagnosis early, take therapeutic measures, improve patient prognosis, and increase the survival period of patients. Hospital researchers in Denmark evaluated the condition of 391 patients after lung cancer resection between 2008-2013. After their training and introduction to CT follow-up in July 2010, CT examinations were performed every 2-3 months for the first 2 years (2010-2012) and every 6 months for the last 3 years (2012-2015). . The results showed that the survival rate of patients increased from 54% to 68% at 4 years after surgery. In addition, the 4-year survival rate increased from 2% to 27% for patients who experienced a recurrence of lung cancer within 2 years after the first surgery, 24 months after surgery. This study suggests that patients who undergo regular follow-up with CT examinations after lung cancer resection have a significantly higher postoperative survival rate and significantly improved survival.