According to data from WHO, lung cancer is today the most common malignant disease in the world. Although it has been known for a long time, its peak has been experiencing just for last couple of decades, proportionally increasing the use of tobacco products, then asbestos, chromium and other carcinogenic substances. Histologically speaking, it is a wide group of diseases that have many subtypes and each of them requires a specific form of therapy. One of the most common methods for treating lung cancer is radiotherapy. Its indications are preoperative use (neoadjuvant concomitant chemoradiotherapy), postoperative use for selected patients, primary treatment with or without associated chemotherapy, palliation of symptomatic disease, and for NSCLC prophylactic cranial irradiation. Radiotherapy planning process starts with the scaned CT images on a particular simulator (CT, MRI, PET-CT). From the initial two-dimensional simulation on a classic RTG device, it has been transformed to three-dimensional CT simulation that is now backed by another additional dimension. The time dimension along with the CT makes perfect 4D technique that minimizes the effect of the respiratory motion of the tumor and makes it easier to delineate the tissue. After the simulation is done, it is important to make a good radiation plan that requires demarcation of the tumor from the healthy tissue, then direct the radiation beams at the right angle and the adequate intensity to get the highest concentration of radiation in the right place. The culmination of the whole process takes place on a linear accelerator where this plan is implemented in practice. A large number of obstacles also required a large number of ways to deliver the dosage, thus creating a variety of methods that overlook the artifacts and damage to healthy tissues. By introducing the IMRT technique, the dosage is delivered in greater amount to the tumor, but planning and therapy last longer. The biggest turnaround in radiotherapy of lung cancer was the introduction of SBRT method, which by its mode of radiotherapy and combination with 4D simulation represents the best curative method of treating patients with early stage tumors.