Dose corrections for low‐density tissue inhomogeneities and air channels for 10‐MV x rays

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Abstract
Methods of correcting for tissue inhomogeneities which consider only changes in the photon fluence are of limited usefulness for 10‐MV x rays. Although there is normally transient electronic equilibrium on the central axis beyond the depth of maximum buildup in soft tissue, when the beam enters a low‐density material the beam profile is degraded and there is a loss of lateral electron equilibrium which reduces the dose both within and beyond the inhomogeneity. This paper describes experimental measurements of the dose within and near large, low‐density inhomogeneities simulating lungs and also behind air channels (where similar effects occur). Methods of calculating correction factors are discussed.

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