2. Is DIBH well tolerated by pediatric patients throughout their treatment? At present, the information material regarding DIBH and the visual feedback equipment (consisting of video goggles) is designed for and aimed at adult patients. In TEDDI, all aspects of the current DIBH workflow will be adapted in order to provide a comfortable setting for pediatric patients. Based on preliminary tests on healthy volunteers, children as young as 5 years are able to comply with the DIBH instructions given by the present visual feedback equipment.