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Advances in Radiation Therapy Enable Doctors to Improve the Quality of Treatments for Patients With Head and Neck Cancer
Date:11/13/2009

f tumor definition if the CT scan is acquired while the patient is swallowing," he said, referencing a study he worked on with colleagues from M. D. Anderson Cancer Center.(7)

According to Dr. Dong, stereoscopic X-ray imaging and volumetric cone-beam CT imaging, two imaging techniques enabled by Varian's On-Board Imager® kV imaging device, make it possible to fine-tune patient positioning just prior to each daily treatment. In addition, frequent imaging can alert clinicians to changes in a patient's anatomy over time, so that a new treatment plan can be developed part-way through a course of treatment whenever warranted--a process called adaptive radiotherapy.

"Preliminary studies have shown that combining IGRT and adaptive IMRT replanning can improve the overall quality of the treatment plan and, most importantly, reduce unnecessary doses to normal organs surrounding the tumor, such as the parotid glands and oral cavities," Dr. Dong said.(8) "Combining IGRT with IMRT creates a powerful tool for high precision radiation therapy."

ABOUT VARIAN MEDICAL SYSTEMS

Varian Medical Systems, Inc., of Palo Alto, California, is the world's leading manufacturer of medical devices and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy. The company supplies informatics software for managing comprehensive cancer clinics, radiotherapy centers and medical oncology practices. Varian is a premier supplier of tubes and digital detectors for X-ray imaging in medical, scientific, and industrial applications and also supplies X-ray imaging products for cargo screening and industrial inspection. Varian Medical Systems employs approximately 5,100 people who are located at manufacturing sites in North America, China, and Europe and in its 79 sales and support offices around the world. For more information, visit http://www.varian.com/
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SOURCE Varian Medical Systems, Inc.
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