作者单位:Division of Radiotherapy and Imaging The Institute of Cancer Research[1]Department of Biosystems Science and Engineering ETH Zurich[2]Radiotherapy Trials QA Group (RTTQA) Royal Marsden NHS Foundation Trust[3]Radiotherapy Department Clatterbridge Cancer Centre[4]Clinical Trials and Statistics Unit The Institute of Cancer Research[5]Department of Medical Physics and Biomedical Engineering University College London[6]