Abstract
We developed a C-arm multi-axis, stereotactic linear accelerator radiosurgical system combined with 3-dimensional (3D) dose planning software. The linac beam generator is mounted on a C-arm frame that allows rotation parallel and diagonal to the patient table. As a result of the new structural design, the positional deviation of the beam from mechanical isocenter during rotation of the gantry is almost less than 0.5 mm. The system can provide 3D stereotactic radiosurgery using precessional convergent irradiation (PCI) without movement of the patient table, which improves accuracy of the irradiation. A satisfactory dose gradient suitable for radiosurgery with fewer arcs was achieved by PCI than was possible with noncoplanar multi-converging arcs (MCA). The 3D dose planning system can accurately optimize the dose plan even for an irregularly shaped target. We have treated 60 cases since 1996 with a reduction of total treatment time.
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