1. A respiration determination apparatus for determining respiration of a person, the apparatus comprising: a bronchial tree image data set provider configured to provide a bronchial tree image data set showing a bronchial tree; a bronchial tree detector configured to detect the bronchial tree in the bronchial tree image set; a respiratory information determiner configured to determine information about the respiration from the detected bronchial tree representation provider configured to provide a representation of a heart of the person; and a heart image generator configured to generate an image showing the representation of the heart depending on the determined information about the respiration, wherein the bronchial tree image data set comprises several bronchial tree images, showing the bronchial tree at different points in time, wherein the bronchial tree detector is further configured to detect a movement of the bronchial tree in the bronchial tree image data set, and wherein the respiratory information determiner is further configured to determine the movement of the bronchial tree as the information about the respiration for generating the image showing the representation of the heart depending on the determined movement of the bronchial tree.