Abstract：Objective To study the feasibility of measuring the accuracy of whole process of the head γ knife treatment by the self-designed water phantom. Methods To make the treatment plan on the CT and MRI images of the water phantom and get the coordinates of exposed spots at x, y, z axis through the film frame with a view to detectingγ knife treatment accuracy in our hospital and the other five hospitals.Results Except localization by the computed tomography of our hospital, the accuracy ofγ knife treatment with localization by the imaging equipments (CT or MRI) in other hospitals all fail to get the technical request that the deviation is supposed to be within 0.5 mm. Deviation is mainly at y axis. After the correction of treatment plan parameters according to the deviation, we can make the deviation within 0.5 mm, thus we can ensure the accuracy of γ knife treatment. Conclusions It is necessary and feasible for our hospital to detect and correct the errors on the accuracy of γ knife treatment. The existing deviation can be diminished through the correction of treatment plan parameters to ensure the accuracy of case treatment and to provide reference and evidence for manufactures.
LI Sheng-yuan,LI Xiao-yang,GAO Li et al. The investigation into measuring the accuracy of γ knife treatment[J]. Chinese Journal of Radiation Oncology, 2013, 22(4): 318-321.
2013, Vol. 22 
