Prediction of COPD Severity Using Electrical Impedance Tomography

This study is looking at whether a non-invasive imaging technology called Electrical Impedance Tomography (EIT) — which measures how electrical signals travel through the lungs — can accurately predict the severity of COPD (chronic obstructive pulmonary disease) without requiring a traditional breathing test. **You may be eligible if...** - Your doctor suspects you may have COPD based on your symptoms and physical exam, but you have not yet had a confirmed diagnosis - You are over 20 years old and able to communicate with medical staff - You are willing to sign an informed consent form **You may NOT be eligible if...** - You refuse the EIT examination - Your CT scan information is incomplete, or your CT scan and breathing test were done more than 180 days apart Talk to your doctor to see if this trial is right for you.