Fig. 2

Comparison of the position and shape of the heart and its substructures at the same level during the three respiratory states at the 0% phase. A Position and shape of the heart and its substructures at the end of calm exhalation, B position and shape of the heart and its substructures at the end of calm inhalation, C position and shape of the heart and its substructures at the end of deep inhalation, and D display of the position and shape of the heart and its substructures under the three respiratory states on an image obtained at the end of calm exhalation