Technology

The Rotating Gamma System® Vertex 360™(RGS Vertex360) is a dedicated neurosurgery radiosurgical system used in the noninvasive treatment of brain tumors.

The RGS Vertex360 utilizes concentric, controlled arcs formed by rotating gamma ray beams that are emitted from thirty cobalt-60 sources. The unique design of the RGS Vertex360 is superior in that it combines the accuracy of the static Gamma Knife* design with the beneficial “arcs” of accelerator-based systems.

The RGS Vertex360’s sources are contained in an outer rotating hemispherical shell and are arranged in an asymmetrical pattern. A matching inner rotating sphere contains various collimator sizes and blocking plugs. A simple switch selection allows the sources in the outer shell and the chosen collimator size in the inner shell to match up and rotate synchronously around the head within the protected machine cavity. This switch-selectable technology provides dramatic advantages not achieved with the older Gamma Knife static design.

*gamma knife is a registered trademark of the Elekta Corporation

American Radiosurgery produces the new RGS Orbiter™, which will treat tumors of the head, neck and spine and entire body. This unique technology will now allow you to treat tumors that cannot be treated using conventional gamma knife* technology. The RGS Orbiter concept is unique in that it is the first single-fraction Cobalt-60 radiosurgical system for treatment of lesions outside of the brain. The design of the RGS Orbiter facilitates the highest level of operator precision while maximizing optimal patient comfort. The patient is fixed to the treatment table with an immobilization device, preventing patient movement during treatment. In the case of a skull treatment, the patient’s head is immobilized via a standard stereotactic head frame. This is the same head frame used in the RGS Vertex360.

The machine is equipped with two body immobilization frames, one used in patient treatment and a second used for imaging. Marking points on the frame ensure precise placement as the patient moves from imaging frame to treatment frame. Patients do not need to wear the body frame when traveling from imaging department to the treatment room.

The treatment head houses 26 Cobalt-60 sources (230.76 Ci) arranged in a single line over a circular segment of ±25° as seen from the isocenter around the patient’s length axis, when the table is in the home position. Initial source activity is 6,000Ci. The source isocenter distance is 469 mm.

The C-arm gantry and open space design of the RGS Orbiter is similar to that of a number of linear accelerator systems. The C-arm gantry enables source rotation with a precision of 0.3-.5 mm.

*gamma knife is a registered trademark of the Elekta Corporation

The Explorer4D™ Treatment Planning System is a sophisticated software package that allows for visualization of patient anatomy and disease status in a rendered three-dimensional display. Treatment planning for the RGS Vertex360 ™ and RGS Orbiter™ is implemented as a plugin to the award winning OsiriX medical imaging software: The plugin takes over OsiriX and adds a dose engine specific to the RGS. All features of OsiriX are still available to the user. The additional functionality is available via the ARGS (Asynchronous Rotating Gamma System) menu.

Features Include:

  • Creating, editing, and saving treatment plans
  • Automatic registration of fiducial marker
  • Display of isodose lines in 2D and multi-planar views
  • Display of Leksell coordinates and dose at mouse positions
  • Dose Volume Histograms (DVH)

The PEPE Flat Panel MV X-ray Detector represents the most advanced amorphous silicon sensor panel available. The PEPE provides image acquisition with the highest achievable SNR(Single to Noise Ratio).

  • A unique Image Viewing System provides critical patient positioning prior to radiation therapy treatment
  • Optimizes treatment field relative to the treatment area as well as field shape and size
  • Compares Orthogonal portal images with Digitally Reconstructed Radiographs(DRR) in performing IGRT
  • Four degrees correction(3 translations and rotation) or Siz-degrees correction(with equipped table) insures best positioning to match treatment planning position