Electromagnetic Navigation Versus CT Guided TTNA in the Diagnosis of Early Peripheral Lung Cancer

Inclusion Criteria: 1. Patients with 0.8-3 cm, high-risk pulmonary peripheral nodules that need biopsy for pathological diagnosis; 2. Patients who are older than 18 year-old; 3. Patients voluntarily join the study and give written informed consent for the study. Exclusion Criteria: 1. Chest CT scan shows that the pulmonary nodule is pure ground glass opacity. 2. Large blood vessels or important structures on the puncture path of peripheral lung tumors； 3. Severe cardiopulmonary dysfunction and other indications that can't receive bronchoscopy.