1. A computer-implemented method for automatically assessing medical ultrasound (US) image usability, the method comprising the steps of: extracting one or more features from at least one part of a medical ultrasound image; calculating for each feature a feature score for each pixel of said at least one part of said ultrasound image; and classifying one or more image pixels of said at least one part as either usable or unusable, based on a combination of feature scores for each pixel, wherein usable pixels have intensity values substantially representative of one or more anatomical structures.