Linac-accelerator-radiosurgery.
A survey is given of the actual possibilities and limitations of the use of linear accelerators (Linac radiosurgery systems) for intra = cranial radiosurgery. Depending on the collimator size, spherical fields from 5-54 mm in diameter can be irradiated with dose gradients from 10% (large fields) to 20% (small fields) per millimeter distance between surface and treatment volume. This is comparable to the possibilities of Gamma-Knife and Proton-irradiation. Optimal mechanical adjustment of gantry and linac table are necessary for the required stability of the isocenter. Mechanical inaccuracy should be smaller than 0.8 mm. Advanced computerized 3D-treatment planning systems are indispensable prerequisites for accurate treatment and use of the flexibility of the linac system. Future developments are outlined.
Sturm
V
V
Department of Stereotactic and Functional Neurosurgery, University of Cologne, Federal Republic of Germany.
Schlegel
W
W
Pastyr
O
O
Treuer
H
H
Voges
J
J
Müller
R P
RP
Lorenz
W J
WJ
D001921:Brain / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D010315:Particle Accelerators / Q000706:statistics & numerical data*; D011829:Radiation Dosage; D016634:Radiosurgery