1. A method for generating a three-dimensional (3D) representation of a left atrium and pulmonary veins, the method comprising: positioning the left atrium at an isocenter of an imaging device as a function of an injection catheter and a spine of a patient; obtaining a 3D-data set of the left atrium and pulmonary veins using the imaging device with the left atrium positioned at the isocenter; and generating a 3D representation of the left atrium and pulmonary veins using the 3D-data set.