1. Institute of Medical Physics and Radiation Protection (IMPS), University of Applied Sciences Giessen, Giessen D‐35390, Germany
2. Institute of Medical Physics and Radiation Protection (IMPS), University of Applied Sciences Giessen, Giessen D‐35390, Germany and Department of Radiotherapy and Radiooncology, University Medical Center Giessen‐Marburg, Marburg D‐35043, Germany