Intensity-modulated radiation therapy (IMRT) is an advanced type of radiation therapy that is used to treat cancer and benign tumours. Beams of radiation are controlled to match the shape of the tumour.
Many small radiation beams of varying intensities are used to treat the tumour accurately. The radiation intensity of each beam is controlled, and the beam shape changes throughout each treatment.
The aim of IMRT is to reduce the amount of radiation to the healthy tissues and limit the side effects of treatment.