An ultrasound imaging system, comprising: a transducer configured to supply ultrasound signals including a first imaging modality and a second imaging modality which is different from the first imaging modality, to a subject and to receive ultrasound echo signals corresponding to the first imaging modality and the second imaging modality from the subject, the first imaging modality and the second imaging modality being interleaved; a processor configured to: produce ultrasound image data from received ultrasound echo signals of the first imaging modality; produce ultrasound image data from received ultrasound echo signals of the second imaging modality; receive signals from a respiration sensor and ignore ultrasound image data if the image data are obtained when the respiration sensor indicates that the subject is breathing; supply the ultrasound image data produced from the received ultrasound echo signals of the second imaging modality to a trained neural network that is configured to identify the location of one or more physical features in the image data; and compute one or more physiological parameters from the identified location of the one or more physical features; and a display configured to display one or more of the computed physiological parameters and the ultrasound image data produced from the received ultrasound echo signals of the first imaging modality; wherein the ultrasound image data produced from the echo signals of the second imaging modality is not shown on the display. a transducer configured to supply ultrasound signals including a first imaging modality and a second imaging modality which is different from the first imaging modality, to a subject and to receive ultrasound echo signals corresponding to the first imaging modality and the second imaging modality from the subject, the first imaging modality and the second imaging modality being interleaved; a processor configured to: produce ultrasound image data from received ultrasound echo signals of the first imaging modality; produce ultrasound image data from received ultrasound echo signals of the second imaging modality; receive signals from a respiration sensor and ignore ultrasound image data if the image data are obtained when the respiration sensor indicates that the subject is breathing; supply the ultrasound image data produced from the received ultrasound echo signals of the second imaging modality to a trained neural network that is configured to identify the location of one or more physical features in the image data; and compute one or more physiological parameters from the identified location of the one or more physical features; and produce ultrasound image data from received ultrasound echo signals of the first imaging modality; produce ultrasound image data from received ultrasound echo signals of the second imaging modality; receive signals from a respiration sensor and ignore ultrasound image data if the image data are obtained when the respiration sensor indicates that the subject is breathing; supply the ultrasound image data produced from the received ultrasound echo signals of the second imaging modality to a trained neural network that is configured to identify the location of one or more physical features in the image data; and compute one or more physiological parameters from the identified location of the one or more physical features; a display configured to display one or more of the computed physiological parameters and the ultrasound image data produced from the received ultrasound echo signals of the first imaging modality; wherein the ultrasound image data produced from the echo signals of the second imaging modality is not shown on the display.