Daily imaging can be performed with an additional secondary cancer risk of less than 1 per 10⁴ PY if kV CBCT is applied. If MV modalities must be chosen, a similar EAR can be achieved with planar images. A further reduction in risk is possible if the imaging geometry allows for sparing of the breast by a partial rotation underneath the patient.
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Dzierma et al. (2018) studied this question.