Physical Comparison Between Extend And G-frame: Preliminary Results In Phantom

Keywords: physics, gamma knife, Extend, stereotactic frame, dose planning

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     Aim of this study is to present our experience in comparison accuracy and reproducibility in repositioning stereotactic systems used for Gamma Knife treatments. Considered devices are the new Elekta Extend System, which permit to treat the patient with multi session radiosurgery without a frame fixed to the skull, and the standard G-Frame.
     During acceptance test we used an anthropomorphic test phantom created for the Extend System and the system itself, to simulate a multi session treatment. The simulation was performed following the standard clinical procedures:
     The precision is 0.2 mm and 0.3 mm in x and y direction respectively and it corresponds to the error in MRI or CT axial acquisition, the error in z direction is 1.3 mm but it is due to the error in coronal reconstruction.
     This is a retrospective study.
     The preliminary analysis of the data shows that Extend System has a good reproducibility and geometric accuracy comparable with standard G-frame. .
     In the next week out target will be to perform the same measurements with the same acquisition using G Frame, and to repeat the same measurements with the same set up for a great number of times and to compare results in order to understand the error in the reproducibility


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