Oldelft Simulix-MC Treatment Planning Simulator

The Oldelft simulator was commissioned in February of 1996,replacing the Therasim 750. Installation of the new Oldelft simulator required extensive room modifications as well as enlargement of the simulator area. The Oldelft Simulix-MC represents the state-of-the-art in modern simulator technology. As with previous simulators in the department, this new simulator is an especially designed x-ray machine that is engineered to replicate the exact capabilities of a linear accelerator or cobalt-60 teletherapy unit. In contrast to the treatment machines, the simulator uses low energy x-rays similar to those used for a chest x-ray or CT scan to create both fluoroscopic images and hard x-ray films outlining treatment portals. The simulator enhances the planning of the treatment by allowing planning of portal directions and setup films without the use of the high-energy beams. Therefore, the planning process can be done carefully and without exposure of high-energy photons to the patients.

As with its predecessors, the Oldelft Simulix-MC eventually is used to take planning films from which the fields will be shaped to exclude normal tissue while delivery maximum dose to the tumor. This ability to delineate normal structures and cancer infiltration is a vital step in the safe and efficient delivery of radiation therapy.

The Oldelft Simulix-MC simulator has new features not present in previous simulators. The pedestal table can mimic any motion achieved by the actual treatment couches and its cantilever design allow for the ability to achieve unique directional fields, which are employed in three-dimensional conformal therapy. The gantry on the simulator has multiple reliability and accuracy systems including collision and guidance systems in a high-quality fluoroscopic unit. These new features add to the ideal situation of near perfect mimicking of actual treatment. The expanded physical space where the simulator resides allows for storage and implementation of the more modern immobilization and imaging devices. Custom immobilization devices allow for stability, reproducibility and overall greater accuracy of treatments.

 

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