Pencil beam method

This method of dose calculation decomposes a broad electron beam into a set of narrow 'pencil beams'. The dose at any given point in irradiated tissue is the summation of the contributions from each of these pencil beams. Individual pencils can be altered appropriately to allow for the effects of inhomogeneities. Thus, some account is taken of lateral scattering of the electrons as well as changes along the raylines. However, the methods used for altering the pencils beams are, by necessity, approximate.

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