Abstract: A method for analysing a structure within a patient's heart includes receiving a patient study including a plurality of images of the patient's heart obtained by an ultrasound device, extracting respective sets of pixel data from the images, and using trained machine learning algorithms to analyse the sets of pixel data to a) identify first images captured using a colour Doppler modality and assign the first images to said structure, b) identify second images captured using spectral Doppler modality and assign the second images to said structure, c) determine a flow convergence zone radius from an analysis of the first images; and d) determine a maximum gradient of structure, from an analysis of the second images. The flow convergence zone radius, the maximum gradient of structure, and a Nyquist value identified for the colour Doppler modality, are combined to determine an Effective Regurgitant Orifice Area for the structure.