Theoretical study for use of Leksell's stereotactic frame in radiosurgery.

The authors examine all the problems connected with the use of Leksell's frame. These problems were studied specifically for the treatment of artero-venous malformation of the brain using small fields and movement therapy of a 10 MV linear accelerator. The technique allows the administration of high radiation doses (25-30) Gy into a very small target within a fraction. In this way the surrounding tissue receives a low dose. The treatment was initially simulated with a dummy. The dosimetry gives an accuracy of +/- 1.5%. This study has been able to resolve all the theoretical and practical problems demonstrating the feasibility of the project which has already been put into effect.