Particle Radiotherapy by Arabinda Kumar Rath & Narayan Sahoo

Author:Arabinda Kumar Rath & Narayan Sahoo
Language: eng
Format: epub, pdf
Publisher: Springer India, New Delhi

4.Are beam apertures necessary? The pencil beam size can change by more than a factor 2 between high energies and low energies (Fig. 7.2). Therefore, when a sharp lateral penumbra is needed at shallow depths, apertures may have a role. Apertures, however, are associated with increased complexity both in terms of workflow (they should be inserted/removed at every field and they require a movable holder in order to have them as close as possible to the patient) and dose calculation (the dose contribution from scatter in the aperture may not be accurately estimated by pencil beam algorithms).

Fig. 7.2Spot size (1 sigma in air at isocenter) as a function of beam range available in Trento

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