Obtaining S values for rectangular–solid tumors inside rectangular–solid host organs

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Abstract
A method is described for obtaining S values between a tumor and its host organ for use with the MIRD formalism. It applies the point-source specific absorbed fractions for an infinite water medium, tabulated by Berger, to a rectangular solid of arbitrary dimensions which contains a rectangular tumor of arbitrary dimensions. Contributions from pairs of source and target volume elements are summed for the S values between the tumor and itself, between the remaining healthy host organ and itself, and between the tumor and the remaining healthy host organ, with the reciprocity theorem assumed for the last. This method labeled MTUMOR, is interfaced with the widely used MIRDOSE program which incorporates the MIRD formalism. An example is calculated.
Funding Information
  • University of Washington (DE‐AM06‐76‐RLO2225)
  • U.S. Department of Energy (DE‐AC06‐76‐RLO1830)

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