Abstract: A method of evaluating ultrasound data for the purpose of ultrasound attenuation estimation in a medium, the medium being associated with ultrasound spatio-temporal signal data received from the medium in response to at least one ultrasound plane and/or diverging wave emitted into the medium, the method including beamforming a first subset of ultrasound spatio-temporal signal data to obtain a second subset of beamformed ultrasound data, determining a focusing quality criterion from the first subset, and evaluating the second subset as a function of the focusing quality criterion of the first subset.