The RGS Vertex360 represents an affordable alternative to existing radiosurgery systems. Its unique design is inherently safer and yields better conformal dose distribution, higher dose escalation, larger beams and faster throughput than other products on the market. The patented rotating technology of the system’s thirty cobalt-60 sources along with the Explorer4D treatment planning software maximize tumor targeting with unprecedented accuracy and precision.


The Rotating Gamma Technology™ incorporates thirty cobalt-60 sources, each with an initial activity of 200 Ci and cumulative 6,000 Ci — identical to that of comparable radiosurgery devices. The sources are arranged in thirty concentric circles that rotate during patient treatment. The beams converge from a greater solid angle as compared with other devices static designs, resulting in a reduction of radiation dose to normal, healthy tissue surrounding the target.

Helmet-Free Technology

With the Rotating Gamma System RGS Vertex360, the secondary collimators are built-in, thus eliminating the need for secondary collimator helmets. This design simplifies setup, reduces patient treatment time and eliminates the need for cumbersome helmet changes in the middle of a procedure.

Both operators and patients appreciate this helmet-free arrangement. The innovative but simple design of the RGS Vertex360 allows for faster throughput and shorter treatment times as compared to traditional radiosurgery devices.


The Rotating Gamma System and its Explorer4D Treatment Planning System utilize Intensity Modulated Radiosurgery (IMRS). IMRS allows for the Rotating Gamma System sources to be periodically turned on and off, thus excluding certain directions from which radiation can enter the skull. This capability has an effect similar to that of plugging or shutting collimators in a static-source device. With the addition of IMRS, the Rotating Gamma System user can set the plugged sectors in arbitrary directions, yielding improved distortion and better gradient dose distribution for highly selective dose planning.

Design 1

Stereotactic Localization System

Mechanical accuracy relies on the stereotactic localization system. First, a stereotactic localization head frame, suitable for the chosen diagnostic procedure (CT or MRI), is fixed on the skull of the patient with sterile screws. With the head frame in place, tomographic scans are made covering the treatment site. The images are transferred to treatment planning system to determine the treatment spot size and location (in terms of the coordinates of the frame support).

The patient is positioned on the treatment couch with the head frame attached to the frame support and the X, Y, Z axes are set according to the treatment plan. The system control automatically carries out the planned treatment including moving the patient in and out of the treatment space, and delivering the required amount of radiation dose for each focal spot location.

Additional Specifications Include:

  1. The mechanical center (isocenter) indicated by the stereotactic frame system (including the frame and the frame support) is within 0.3 mm from the rotational isocenter when fully engaged in the treatment position.
  2. The mechanical center as indicated by the stereotactic localization system is accurate with relation to the radiation isocenter to within 0.5 mm in all directions. Adjustments can be made to the frame or the support so that the service engineers can fine-tune the localization system at installation or during later service to meet these requirements.
  3. The frame is made of aluminum and the screws are titanium. The design is comparable to existing stereotactic frames on the market.
  4. The screws and the frame are to be sterilized after every use.
  5. Deformation in any dimension is less than 0.1 mm when 50 kg force is applied. The weight of the entire frame including the screws is less than 1 kg. The frames will withstand 400 kg of clamping force.
  6. An accuracy verification device is available for daily verification of the integrity of the frame.
  7. Coordinate markers are available for both CT and MRI scans. The positions of the markers are clearly visible on the corresponding images and are suitable for automatic computer recognition and manual identification.

Robotic Head Positioning System (RHPS)

This Robotic System is based on high precision optical dish drives in the x-y-z direction. These drives are accurate to microns and are completely located under the patient’s shoulders. No headroom is lost with this upgrade.

The base of the system is a standard optical instrument x-y drive system under the patient’s shoulder. This drive system is completed with a z-drive and the head ring mounting structure.