Normal tissue dose and second cancer risk due to megavoltage fan-beam CT, static tomotherapy and helical tomotherapy in breast radiotherapy.

Quinn, Alexandra; Holloway, Lois; Hardcastle, Nicholas; Tomé, Wolfgang A; Rosenfeld, Anatoly; Metcalfe, Peter · Radiother Oncol · 2013

Level III

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Abstract

This study investigates the dose from the 1mm collimator width megavoltage fan-beam CT (fine, normal and coarse pitch) available on tomotherapy as well as for whole-breast tomotherapy treatments. The BEIR VII lifetime attributable risk model was utilised to assess the significance of the imaging dose relative to the treatment dose.

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