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Accuray Receives FDA Clearance for New Dose Calculation Technique for Body Radiosurgery
Date:9/10/2007

Worldwide Availability of Monte Carlo Dose Calculation Software Announced

at European Radiation Oncology Meeting in Barcelona

BARCELONA, Spain, Sept. 10 /PRNewswire-FirstCall/ -- Accuray Incorporated (Nasdaq: ARAY), a global leader in the field of radiosurgery, announced today that its Monte Carlo Dose Calculation algorithm has received 510(k) clearance from the U.S. Food and Drug Administration and is now commercially available worldwide. This announcement was made as part of the product's launch at the 9th Biennial European Society for Therapeutic Radiology and Oncology (ESTRO) meeting on Physics and Radiation Technology for Clinical Radiotherapy in Barcelona, Spain.

Treatment with radiation therapy or radiosurgery requires a linear accelerator to deliver one or more x-ray beams to a target. Each beam is made up of trillions of photons, and each photon follows an individual path to the target. Traditional dose calculation methods assume all photons take a single path and therefore use a single calculation to represent the dose delivered by all photons.

Monte Carlo methods are considered the gold standard of probabilistic statistics. The Monte Carlo dose calculation method takes the probability and potential interactions for each individual photon into account when it calculates the dose being delivered by a single photon. It then considers the probabilities for each of millions of photons to generate a dose calculation for the target and surrounding structures.

Previously, because of the repetition of algorithms and the large number of calculations involved, Monte Carlo dose calculations were time consuming to compute and therefore were difficult to employ in clinical settings. No
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SOURCE Accuray Incorporated
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