Stanford Study on CyberKnife Radiosurgery for Prostate Cancer Demonstrates 100 Percent PSA Response at... (s far has been very positive. Be...)

Stanford Study on CyberKnife Radiosurgery for Prostate Cancer Demonstrates 100 Percent PSA Response at 33 months

Date:3/31/2009

s far has been very positive."

Because the prostate can move unpredictably due to bowel gas or filling of the bladder, it is important that prostate motion is assessed and corrected for throughout treatment to allow for accurate radiosurgery treatment. Recent studies have confirmed that the prostate experiences rapid and unpredictable motion of as much as five millimeters in as few as 30 seconds, meaning that radiosurgery delivery must recognize and correct for even the slightest motion to ensure the target receives adequate dose and the surrounding sensitive structures, such as the rectum, bladder, urethra and nerves, are maximally spared.

In September 2008 Accuray launched the InTempo(TM) Adaptive Imaging System, which enhances the CyberKnife System's ability to continually track and correct for motion of the prostate during treatment. With the InTempo System, CyberKnife radiation delivery automatically adapts to each individual patient's prostate motion by intelligently increasing the imaging frequency during periods of rapid and erratic prostate movement. This continual assessment of prostate motion, combined with the CyberKnife System's automatic correction for movement in real-time, not only helps to ensure prescribed doses are delivered to the prostate; it also helps to ensure surrounding structures are avoided, minimizing associated side effects and complications. Using the InTempo System, the CyberKnife System drastically minimizes the "image age" - or time between image capture and when individual beam delivery is complete - to as few as 10 seconds.

Conventional IGRT therapies and other "rapid" radiation delivery techniques typically provide imaging limited to only pre-treatment set-up and therefore lack the ability to recognize motion that occurs during treatment delivery. With such conventional techniques there is - at minimum - a two minute delay in the time between when the image is captured and the b
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Stanford Study on CyberKnife Radiosurgery for Prostate Cancer Demonstrates 100 Percent PSA Response at...(s far has been very positive. Be...),Health