Department of Nuclear Medicine,Cancer Hospital,Chinese Academy of Medical Sciences,Peking Union Medical College,Beijing,100021,China;
Department of Physics,Inner Mongolia Normal University,Huhhot,010022,China;
Mathematics Institute,Peking University,Beijing,100871,China;
Department of Physics,Laval University,Quebec,GIK 7P4,Canada;
Department of Nuclear Medicine,Cancer Hospital,Chinese Academy of Medical Sciences,Peking Union Medical College,Beijing,100021,China;
Department of Nuclear Medicine,Cancer Hospital,Chinese Academy of Medical Sciences,Peking Union Medical College,Beijing,100021,China;
cell recognition; moment invariant;