1. A method for visualizing a hollow organ of a patient, comprising: recording an x-ray image dataset of the hollow organ by an x-ray system; recording a number of individual x-ray images of an instrument having a data capture unit during a movement of the instrument through the hollow organ by the x-ray system, wherein the individual x-ray images feature time of recoding the individual x-ray images; simultaneously recording datasets of the hollow organ by the data capture unit during the movement of the instrument, wherein the datasets feature time of recording the datasets; registering the individual x-ray images with the x-ray image dataset by an imaging processing unit; detecting positions of the instrument based on the individual x-ray images by the imaging processing unit, wherein the individual x-ray images are 2D fluoroscopy or angiography x-ray images; determining the datasets and the individual x-ray images having same time of recording; assigning the datasets recorded by the data capture unit with the individual x-ray images having the same time of recording so that the detected positions of the instrument based on the individual x-ray images are spatially assigned to the datasets by the imaging processing unit; and jointly visualizing the datasets recorded by the data capture unit with the x-ray image dataset by a display unit.