Computer implemented method for characterizing particle objects, comprising the following steps: a) generating one or more radiation beams (IW, IW') propagating along respective optical axes (z, z'); b) illuminating with said one or more radiation beams (IW, IW') one or more observation regions (MR, MR') that are transited by a particle object, said one or more observation regions (MR, MR') being arranged within the Rayleigh zone of the respective radiation beams (IW, IW'), wherein a fraction of at least one of the radiation beams - hereinafter, scattered fraction - is scattered upon interaction with the particle object transiting in the respective observation region (MR, MR'), and another fraction - hereinafter, transmitted fraction - is transmitted along the respective optical axis (z, z') through the respective observation region (MR, MR'), without interacting with the particle object transiting in the respective observation region (MR, MR'); c) collecting, at the optical axis (z) of at least one of the radiation beams, an interference image determined by the interference between the transmitted fraction and a part of the scattered fraction that propagates around the direction of the optical axis (z) - hereinafter, first part of the scattered fraction -; d) collecting, at at least one non-zero scattering angle (θ, θ') with respect to the optical axis (z, z') of at least one of the radiation beams, a part of the scattered fraction that propagates at the scattering angle (θ, θ') - hereinafter, second part of the scattered fraction -, and measuring at least one scattered radiation intensity value determined by said second part of the scattered fraction; e) calculating, from said interference image, a pair of independent quantities that define the complex field of the first part of the scattered fraction; f) calculating, from said pair of independent quantities, a theoretical scattered radiation intensity value that would be measured at the scattering angle (θ, θ') based on a theoretical model representing the particle object, said theoretical model being defined based on at least one parameter representing a characteristic of the particle object; and g) comparing the measured scattered radiation intensity value with the theoretical scattered radiation intensity value. a) generating one or more radiation beams (IW, IW') propagating along respective optical axes (z, z'); b) illuminating with said one or more radiation beams (IW, IW') one or more observation regions (MR, MR') that are transited by a particle object, said one or more observation regions (MR, MR') being arranged within the Rayleigh zone of the respective radiation beams (IW, IW'), wherein a fraction of at least one of the radiation beams - hereinafter, scattered fraction - is scattered upon interaction with the particle object transiting in the respective observation region (MR, MR'), and another fraction - hereinafter, transmitted fraction - is transmitted along the respective optical axis (z, z') through the respective observation region (MR, MR'), without interacting with the particle object transiting in the respective observation region (MR, MR'); c) collecting, at the optical axis (z) of at least one of the radiation beams, an interference image determined by the interference between the transmitted fraction and a part of the scattered fraction that propagates around the direction of the optical axis (z) - hereinafter, first part of the scattered fraction -; d) collecting, at at least one non-zero scattering angle (θ, θ') with respect to the optical axis (z, z') of at least one of the radiation beams, a part of the scattered fraction that propagates at the scattering angle (θ, θ') - hereinafter, second part of the scattered fraction -, and measuring at least one scattered radiation intensity value determined by said second part of the scattered fraction; e) calculating, from said interference image, a pair of independent quantities that define the complex field of the first part of the scattered fraction; f) calculating, from said pair of independent quantities, a theoretical scattered radiation intensity value that would be measured at the scattering angle (θ, θ') based on a theoretical model representing the particle object, said theoretical model being defined based on at least one parameter representing a characteristic of the particle object; and g) comparing the measured scattered radiation intensity value with the theoretical scattered radiation intensity value.