Intensity modulated Radiation Therapy (IMRT) is a type of conformal radiation, which shapes radiation beams to closely approximate the shape of the tumor. The intensity of the radiation in IMRT can be changed during treatment to spare more adjoining normal tissue than is spared during conventional radiation therapy. Because of this an increased dose of radiation can be delivered to the tumor using IMRT.
How does it work?
IMRT utilizes beams shaped by multileaf collimators (MLCs) that move in and out of the beam’s path during treatment, varying the radiation beam intensity across the targeted field.
A combination of such beams of varying intensity allows a highly sculpted three dimensional distribution of radiation, maximizing dose to the tumour while reducing or even avoiding healthy tissues. Advanced computer planning helps to find the best combination of beams to achieve the desired results.