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Intensity Modulated Radiotherapy


Intensity Modulated Radiotherapy

Intensity Modulated Radiation Therapy (IMRT) is a specialized 3D conformal radiation treatment plan where thousands of tiny beams from several beam angles are used to target a tumor. The radiation intensity of these beams is modulated, or controlled, with a system of movable leaves called a multi-leaf collimator (MLC). The leaves conform to the shape of the tumor and block out unwanted radiation. With sophisticated dose calculation methods each leaf can move independently to create tiny beamlets of radiation that specifically target a tumor. This treatment technique provides the means to escalate tumor doses while significantly sparing normal tissue. Less radiation to normal tissues translates into fewer complications for patients. IMRT is ideal for stationary tumors situated near critical structures such as the spinal cord, heart and eyes. Some typical treatment sites include the prostate, brain and breast. As with 3D conformal treatments, IMRT is planned by our radiation oncology team using the advanced Eclipse treatment planning system from Varian Medical Systems.

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© Stony Brook University Physicians              Phone: 631-444-3627 - PO Box 1554 Stony Brook, NY 11790-0988              Serving Suffolk & Nassau County, Long Island, NY

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The Stony Brook University Physicians website is primarily an informational and educational resource. It should not be used in place of medical advice and recommendations you receive from your health care provider. If you have, or suspect that you have a medical problem or condition, please seek the advice of your health care provider.


Stony Brook University Physicians provides marketing advice and consultation to the Stony Brook University Faculty. It does not provide medical care directly or indirectly nor does it oversee, direct, manage or supervise the medical care provided by any of the individual Practices. The individual Practices are responsible for the medical care each Practice provides to its patients. Please note that the Practices listed below are separate University Faculty Practice Corporations (UFPCs).