A method for centering a left atrium and pulmonary veins at an isocenter of an imaging device is provided. The method includes positioning an injection catheter at a bifurcation of a pulmonary artery obtaining an anterior or posterior flouroscopic image of area including and/or surrounding the left atrium and pulmonary veins and moving the imaging device, patient support, or the combination thereof, such that the injection catheter and a spine of a patient are displayed in the fluoroscopic image.
