Viewray Dynamic PhantomModel 008V
IMAGE ACQUISITION * TREATMENT PLANNING * DOSE DELIVERY
The Viewray® Dynamic Phantom is used to validate the unique capabilities of the Viewray System to track and deliver a gated treatment based on real-time MRI imaging. Dosimetry capabilities of the phantom enhance the validation of the Viewray system from the planning phase to the final stage of gated treatment delivery. The phantom is designed to meet Viewray Requirements Specification document RQ-0034 Rev C.
The phantom body represents an average human thorax. It is comprised of a plastic shell with a cylindrical thru-hole to accommodate a moving rod with simulated target. The embedded MRI/CT target is made of an MRI target gel that provides contrast with respect to the surrounding MRI background gel so as to allow tracking of tumor motion. The target can receive an ion chamber for treatment dose verification. The moving rod is connected to a motion actuator box that induces three-dimensional target motion through linear translation and rotation of the rod. In addition to the dosimetry target, the rod also contains an offset target and a cylindrical region made of MRI target gel to increase the targets’ tracking accuracy.
The Viewray Dynamic Phantom includes four spherical static targets and a fifth rectangular parallelepiped target to simulate organs at risk. Each of these three targets receives an ion chamber for dosimetry measurements. The body targets made of MRI target gel are surrounded by the same MRI background gel used in the moving rod. These targets allow for dosimetry measurements with the same ion chamber as the one used for the moving rod. Also, they can be used to check for the automatic target delineation.
The phantom is equipped with a target motion position output, which provides two square-waves that can be analyzed on an oscilloscope against “Beam On” – “Beam Off” to determine beam latency, which is important in gated treatments.
The phantom comes in two custom hard-sided cases and is equipped with a user guide and one-year warranty.
Validated specifically for Viewray Systems
3D target motion and static targets receive ion chambers
Adaptive RT plan verification
Voltage output to verify gating
Body & rod filled with gels to eliminate liquid specific image artifacts
*Viewray® is a registered trademark (Oakwood Village, OH)