The TomoTherapy System has broad applicability to many types of cancer. It combines Spiral CT Scanning and Intensity Modulated Radiation Therapy (IMRT), allowing high dose radiation beams to be delivered to a tumor from all angles while minimizing the dose to surrounding tissue. IMRT allows for the radiation dose to conform more precisely to the three-dimensional (3-D) shape of the tumor by modulating–or controlling–the intensity of the radiation beam. As with a CT Scanner, the patient moves through the unit and a special X-ray therapy spirally rotates around the patient.

USA's complement of radiation oncology technologies also includes the USA Medical Center Cyberknife System, as well as the MCI Physician office Varian linear accelerators.

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