High-energy linear accelerators with photon radiation are
widely used in radiation oncology. In parallel with the technological
developments, the design of collimators used in linear
accelerators is also changing. The difference in the design
of the collimators is directly related to the dose at the edge
and outside of the field. Collimator designs become even
more important in radiotherapy techniques where adjacent
orthogonal fields are used. In this study, the linear accelerators
used in radiation oncology and collimator designs were
investigated by examining the existing literature on the advantages
of these designs. At the conclusion of this study, the
differences in the design of collimators of linear accelerators
and the dose distribution at the edge of the field were seen
to be important and effective in clinical applications and are
discussed in detail.
Keywords: Multi-leaf collimator; transmission; penumbra
