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U.K. Clinic Anticipating New Era of Radiotherapy Speed and Precision with Elekta's New Versa HD System
Date:4/10/2013

requires two arcs of about 90 seconds each," he says. "With the high leaf speed and increased dose rate, we should be able to treat using just one arc of about 60 seconds."

The very high doses per fraction in stereotactic body radiation therapy (SBRT) cases currently require the most beam delivery time compared to other techniques. The challenge in The Christie's lung SBRT cases has been keeping the patients still during the treatment session, Dr. Rowbottom adds.

"Patients often move partway through therapy, requiring us to stop treatment and repeat imaging steps, which lengthens treatment time significantly," he says. "With high dose rate delivery, we will be able to shorten the treatment fraction to the point patients won't be struggling to remain still. If we can get the patient through the system quickly, we think it will be a really strong benefit for them."

Taking weeks off prostate radiotherapy
Worldwide, many clinical centers have been exploring ways to shorten the course of prostate radiotherapy, typically a seven-week long process involving nearly 40 trips to the clinic. High dose prostate SBRT has the potential to shorten the treatment course to as few as five to seven fractions. The unique capabilities of Versa HD are tailor-made for the emergence of prostate SBRT, which The Christie will begin in about six months as part of a Swedish multi-center clinical trial, Dr. Rowbottom notes. While speed and field shaping precision are critical attributes of Versa HD, the system is much more than that, according to Dr. Rowbottom. 

"With the final product it's clear to me that Versa HD is more than just developing a certain capability – the whole package was looked at," he says. "While it has High Dose Rate mode and high leaf speed, it also can treat a 40 X 40 cm field size, it has 5 mm leaves across the whole field, and new system ergonomics. The entire system was put together by thinking through all the different comp
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