CT scan is a medical imaging technique that uses X-rays to create cross-sectional images of the body. It can be used to diagnose various diseases, including lung cancer. CT scan is an effective tool for detecting lung cancer because it provides detailed information about the size, shape, and location of the tumor. Lung cancer is a type of cancer that affects the lungs and can cause shortness of breath, coughing up blood, and other symptoms. CT scan can help doctors identify the presence of lung cancer early on, allowing for more effective treatment options and better outcomes for patients.