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Intensity-modulated radiation therapy, or IMRT, is an advanced technique that delivers precise radiation to a tumor site. It begins with detailed imaging of the tumor through either computed topography (CT) scanning or magnetic resonance imaging (MRI). These tests allow the treatment team to visualize the size and shape of the tumor and enable the IMRT computer to customize radiation delivery.
The treatment itself uses linear accelerators to send individualized doses of radiation into the tumor. The linked computer controls both the intensity and the direction of the beam, which then fits to the shape of the tumor. This minimizes exposure of nearby healthy tissue and thus allows the treatment team to use higher dosage levels, while simultaneously helping to reduce side effects.