Intensity-Modulated Radiotherapy (IMRT) is an advanced radiotherapy technique designed to precisely concentrate the radiation dose on tumors while minimizing damage to surrounding healthy tissues. IMRT utilizes computer-assisted planning to employ multiple finely tuned radiation beams from different directions and with varying intensities. This allows for the precise adjustment of radiation dose intensities according to the three-dimensional shape and location of the tumor, ensuring that the radiation dose distribution is focused on the treatment target while reducing the impact on nearby normal tissues. IMRT is suitable for treating various types of cancers and tumors, including head and neck cancers, breast cancer, prostate cancer, and other tumors with complex shapes.