A method for generating a tracked imaging region representing ultrasound data acquired from a subject, the method comprising: - obtaining ultrasound data acquired from an imaging region by way of an ultrasound probe; - obtaining a first image of a surface acquired during the acquisition of the ultrasound data by way of an image sensor coupled to the ultrasound probe; - obtaining a second image of the surface acquired during the acquisition of the ultrasound data by way of the image sensor; - comparing the first image and the second image; - computing a first motion component of the ultrasound probe based on the comparison; - obtaining a second motion component of the ultrasound probe acquired during the acquisition of the ultrasound data by way of an inertial measurement unit coupled to the image sensor; - combining the first motion component and the second motion component, thereby generating a motion of the ultrasound probe; - combining the ultrasound data from the imaging region based on the motion of the ultrasound probe, thereby generating a tracked imaging region; characterized in that the ultrasound data comprises Doppler ultrasound data and the method further comprises: - generating a 3D Doppler vessel map based on the Doppler ultrasound data and the motion of the ultrasound probe; and - deriving a blood flow measure from the 3D Doppler vessel map, wherein deriving the blood flow measure comprises one or more of: - calculating an angle between an imaging region of the ultrasound probe and the central axis of a vessel based on the motion of the ultrasound probe and adjusting the Doppler ultrasound data based on the calculated angle; and - calculating a cross sectional area of a vessel based on the 3D Doppler vessel map and adjusting the Doppler ultrasound data based on the calculated cross-sectional area. - obtaining ultrasound data acquired from an imaging region by way of an ultrasound probe; - obtaining a first image of a surface acquired during the acquisition of the ultrasound data by way of an image sensor coupled to the ultrasound probe; - obtaining a second image of the surface acquired during the acquisition of the ultrasound data by way of the image sensor; - comparing the first image and the second image; - computing a first motion component of the ultrasound probe based on the comparison; - obtaining a second motion component of the ultrasound probe acquired during the acquisition of the ultrasound data by way of an inertial measurement unit coupled to the image sensor; - combining the first motion component and the second motion component, thereby generating a motion of the ultrasound probe; - combining the ultrasound data from the imaging region based on the motion of the ultrasound probe, thereby generating a tracked imaging region; - generating a 3D Doppler vessel map based on the Doppler ultrasound data and the motion of the ultrasound probe; and - deriving a blood flow measure from the 3D Doppler vessel map, wherein deriving the blood flow measure comprises one or more of: - calculating an angle between an imaging region of the ultrasound probe and the central axis of a vessel based on the motion of the ultrasound probe and adjusting the Doppler ultrasound data based on the calculated angle; and - calculating a cross sectional area of a vessel based on the 3D Doppler vessel map and adjusting the Doppler ultrasound data based on the calculated cross-sectional area. - calculating an angle between an imaging region of the ultrasound probe and the central axis of a vessel based on the motion of the ultrasound probe and adjusting the Doppler ultrasound data based on the calculated angle; and - calculating a cross sectional area of a vessel based on the 3D Doppler vessel map and adjusting the Doppler ultrasound data based on the calculated cross-sectional area. <EOS>