1. A method for extracting a personalized left atrium model from a 3D image volume, comprising: segmenting a left atrium chamber body in the 3D image volume; detecting at least one pulmonary venous ostia on the segmented left atrium chamber body using at least one trained detector; and segmenting at least one pulmonary vein trunk connected to the left atrium chamber body based on the detected pulmonary venous ostia.