Abstract
Historically, a homogeneous tissue density (HTD) was assumed for treatment planning for thoracic tumors. However, nearly all modern treatment planning systems are capable of incorporating a heterogeneity correction (HC) to account for decreased attenuation and lateral scatter in the lungs. A field margin must be applied to a planning treatment volume (PTV) in order to adequately cover the tumor with the prescription dose. We examined the influence of HC in addition to other physical factors as well as patient anatomy on the field margin.
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