Importance

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Abstract

An energy filtering system including an energy filtering material provided between a radioactive material and a treatment target such that radioactive energy is filtered. In a preferred embodiment, the filtering material is provided as a thin-walled layer, such as a micro-foil, mesh, helically wound spring, film, coating or stackable right-angle disks, among others, at one or more locations between the radioactive source and a treatment target, to filter the radiation energy during treatment. The filtering material may be a high-density material, such as platinum, applied or incorporated in a supporting structure between the radioactive material and the treatment target. The supporting structure may include a catheter having a treatment end, a source wire movable within the catheter, a stent or indeed, any structure positionable between a source of radiation and a treatment site.

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First Claim