Image Guided Radiation Therapy (IGRT)

Today, using a technology known as image-guided radiation therapy (IGRT), a tumor can be imaged just before the delivery of radiotherapy or even during a treatment, enabling radiation oncologists to verify its exact location, thereby reducing the margin of healthy tissue exposed to radiation to five millimeters and, in certain cases, to as little as one or two millimeters. If a tumor has shifted even slightly since a patient’s last visit, the radiation beams can be adjusted so that they hit it precisely.