Abstract
Relative large variations in DVH values are observed between respiration phases. However, only a small systematic effect is seen in changing between the midventilation phase and the expiration or inspiration phase. The changes are thus not directly related to changes between these phases but simply to small image differences (artefacts) between the different respiration phases. The position and extension of the tumour is a main uncertainty in stereotactic lung cancer treatment. It is therefore important that the images exactly reflect the tumour and surroundings. Image artefacts are less in the expiration phase in which the respiration induced motion is minimal. It is therefore beneficial to perform delineation and plan calculations in the expiration phase, as long as the actual treatment delivery is based on the mid-ventilation phase.
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