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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

MRT patients did better not just in terms of dry mouth, but also other quality of life dimensions, including swallowing and nutrition."(3)(4)(5)

According to Eisbruch, RTOG 0225, another multi-institutional study looked at IMRT with or without chemotherapy for head and neck cancer, and also reached positive conclusions. "That group reproduced the excellent results that individual treatment centers had been reporting, namely, a 90% loco-regional progression-free survival with minimal grade 3 and no grade 4 xerostomia."(6)

IMRT involves shaping radiotherapy treatment beams so that they deliver a dose pattern that matches the size and shape of a targeted tumor while minimizing exposure of surrounding healthy tissues and organs. This approach has been widely adopted by radiation oncologists for the treatment of diverse forms of cancer. Ongoing clinical studies are now maturing, allowing long term outcomes to be assessed and validating IMRT based on clinical data.

Improving IMRT Through Image-Guidance

Lei Dong, PhD, associate professor of medical physics at the MD Anderson Cancer Center in Houston, Texas, detailed how new image-guidance technologies further enhance the accuracy of IMRT treatments by enabling clinicians to correct for patient set-up uncertainties and anatomical changes over a course of treatment.

"Clinicians naturally want to take advantage of the more conformal dose distributions that IMRT makes possible by reducing the treatment margins around a tumor, to protect more healthy tissues," said Dr. Dong. "When we do that, it is important to ensure that the treatments are targeted very precisely, so the tumor receives the high dose treatments, and the dose to surrounding tissues and organs is kept as low as possible."

Dr. Dong discussed the issue of basing radiotherapy treatment plans on single CT scans taken during treatment simulation. "Internal motion can affect the accuracy o
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SOURCE Varian Medical Systems, Inc.
Copyright©2009 PR Newswire.
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