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An Assessment of Action Levels in Imaging Strategies in Head and Neck Cancer using TomoTherapy. Are Our Margins Adequate in the Absence of Image Guidance
Clinical Oncology, 10/07/09

Houghton F et al. – Reducing the action level at which the systematic error is corrected improves the probability of treatment delivery accuracy. Using the NAL correction protocol reduces the number of fractions that have set–up displacements outside a 5mm CTV–PTV margin. Although a 5mm margin is probably sufficient for standard HNC radiotherapy, change to a 3mm margin is not favoured at the centre without access to daily image–guided radiotherapy.

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