The high dose per fraction associated with SBRT necessitates a high degree of accuracy in target localisation and dose delivery.
Small errors can result in significant under treatment of portions of the tumor volume and over dosages of nearby normal tissues. The E2E® SBRT Phantom provides a means to check the entire treatment chain during commissioning and routine QA. The Model 036A-CVXX-xx* is an anthropomorphic thorax body containing articulated spine, ribs, and lungs. All materials are suitable for use in kV and MV energies. The thorax section contains two lung tumor volumes with ionisation chamber cavities in the center of each target.
The phantom also includes a lung insert with a kidney-shaped lung target. The proximity of the lung target to the vertebral body allows clinicians to measure high-resolution dose distribution to the target and dose to the spinal chord in a single delivery. An axial slice of the thorax enables high resolution dose distribution measurements to the vertebral body and vertebral chord. Ready-cut films with integral registration holes are available for both the lung insert and axial slice. The surface of the thorax body is machined with concentric circle targets, point targets and alignment marks for daily system checks. An optional abdominal section (Model 036-01) with 3D spine anatomy for Gapchronic Film and nanoDot™ dosimetry is available separately. It can also accommodate the CBCT Image Quality phantom (Model 062QA-35). The Model 036-01 provides extra bolus to allow non-coplanar dose assessments with the thorax. The SBRT phantom is a single tool for end-to-end localisation assessment and dosimetric evaluation for use on both SRS Frame-based and IGRT systems.