1. Department of Physics, Aveiro University, Aveiro, Portugal
2. School of Allied Health Technologies, Polytechnic of Porto, Porto, Portugal
3. Department of Mathematics, Center for Research and Development in Mathematics and Applications, Aveiro University, Aveiro, Portugal
4. Department of Radiation Therapy, Portuguese Oncology Institute of Coimbra Francisco Gentil (IPOCFG), Coimbra, Portugal
5. Department of Medical Physics, Portuguese Oncology Institute of Coimbra Francisco Gentil, Coimbra, Portugal