A process for the preparation of a vascular image and methods for fluoroscopic visualization of vessels and correspondingly designed imaging system

The invention relates to a method for creating a selective vessel image within a volume portion of an object to be examined by means of an imaging system (10). The method comprises the steps of: Create a vascular image of the bulk portion, with the following steps: • acquiring imaging data of the volume portion within a predetermined time interval by means of the imaging system (10). • determining a maximum opacity within the time interval due to a contrast agent administered to the object to be examined per pixel of the vascular image. • segmenting vessels by deciding depends on the maximum opacity of the pixel, whether the particular pixel belongs to a vessel. Determining a contrast agent arrival time per pixel of the vascular image. Segmenting whether the respective vessel of the vascular image is one of a vessel of the selective vessel image when a flow-through area of ​​the vessel perpendicular to the flow direction is less than a predetermined maximum size threshold value and greater than a predetermined minimum size threshold, and if the contrast agent arrival time of the pixels of the vessel is less is than a predetermined maximum contrast agent arrival time threshold value and greater than a predetermined minimum contrast agent arrival time threshold.