1. FEUC and Inesc‐Coimbra, University of Coimbra, Coimbra 3004512, Portugal
2. Inesc‐Coimbra, University of Coimbra, Coimbra 3000033, Portugal
3. Medical Physics Department, IPOCFG, EPE, Coimbra, Coimbra 3000075, Portugal and Physics Department, University of Aveiro, Aveiro 3810193, Portugal
4. School of Allied Health Technologies Polytechnic Institute of Porto, Vila Nova de Gaia, 4400330 and I3N Department of Physics, Aveiro University, Aveiro 3810193 Portugal
5. Medical Physics Department, IPOCFG, EPE, Coimbra 3000075, Portugal