Impact of Breathing Phase on Thoracic Dose Distribution - an IMRT Treatment Planning Study using 4D CT Image Data - Werner, René; Fabian Fehlauer; Jan Ehrhardt; Albers, Dirk; Cremers, Florian; Schmidt, Rainer; Heinz Handels (9th Biennial ESTRO Meeting on Physics and Radiation Technology For Clinical Radiotherapy of the European Society of Therapeutic Radiology, ESTRO 2007, 2007)