Abstract
Linear accelerator based stereotactic radiotherapy systems have traditionally utilized rotational arcs with small circular collimators to create relatively conformal dose distributions within a target volume [1,2]. Large or irregularly shaped targets require multiple isocenters to achieve conformality at the expense of dose inhomogeneity within the target volume. The micro-multileaf (MLC) collimator is a recent innovation specifically designed for small-field stereotactic radiotherapy that has improved the conformality of dose delivery to irregularly shaped targets [3–8]. This is accomplished by movement of the narrow-leaf collimators to conform to the shape of the target as seen through a “beams-eye-view” projection during arc rotation. However, neighboring critical structures and physical constraints imposed by patient fixation devices often limit the beam trajectories and geometries available for dose delivery. Dose delivery through limited numbers of fixed fields may be optimal in these situations. However, it is often difficult to achieve a uniform dose distribution using uncompensated or non-intensity modified beams.
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© 2000 Springer-Verlag Berlin Heidelberg
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Watson, G.A., Leavitt, D.D., Tobler, M., Gaffney, D.K., Gibbs, F.A. (2000). Application of Enhanced Dynamic Wedge to Stereotactic Radiotherapy. In: Schlegel, W., Bortfeld, T. (eds) The Use of Computers in Radiation Therapy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59758-9_71
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DOI: https://doi.org/10.1007/978-3-642-59758-9_71
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