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Scientific Presentations at 2011 AAPM/COMP Meeting Highlight TrueBeam® and RapidArc® Radiotherapy Systems From Varian Medical Systems
Date:8/9/2011

cal and gastrointestinal cancers.

Clinicians from St. Luke's Hospital in Bethlehem, Pennsylvania, described an approach to RapidArc treatment planning that enabled them to achieve superior dose distributions for treating spine tumors with stereotactic radiosurgery.  Their poster presentation studied the dosimetry characteristics of 11 RapidArc treatment plans for spinal tumors, and concluded that their RapidArc plans "allow for extremely rapid dose fall off," which means that outside the target area, the dose levels drop very quickly to help protect surrounding healthy tissues.(3)

RapidArc delivers a precise and efficient treatment in a single or multiple arcs of the treatment machine around the patient and makes it possible to deliver image-guided radiotherapy treatments two to eight times faster than is possible with conventional approaches such as fixed-field IMRT or 3-D conformal radiotherapy.

The scientific program at the 2011 joint meeting of the American Association of Physicists in Medicine (AAPM) and the Canadian Organization of Medical Physicists (COMP) included other notable presentations and posters:

  • Researchers from Memorial Sloan-Kettering Cancer Center in New York presented about a method they developed for imaging patients during RapidArc treatments, using the imager on Varian's TrueBeam system to facilitate real-time image guidance. (4)*
  • A team from Vanderbilt University Medical Center in Nashville, Tennessee, conducted measurement studies to verify that the TrueBeam system's imager can produce 3-D (cone-beam CT) images using less X-ray dose than earlier generations of technology, without compromising image quality.(5),*
  • Stanford University researchers reported on a quality assurance (QA) method for gated RapidArc treatments designed to compensate for respiratory motion during stereotactic body radiotherapy treatments.  They s
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