1. An X-ray imaging system for automatically detecting and indicating location of, an invasive anatomical device in an image, comprising: an interface for acquiring, data representing X-ray images of patient vessels and data identifying a particular vessel containing a medical device; an image data processor for, employing a model of anatomical vessels to select a region of interest in a vessel identified by the acquired data and automatically determining a location of said medical device in a region of interest of an acquired image by determining at least a portion of an outline of said medical device by detecting a luminance transition in said acquired image using an image edge detector; and a display processor for initiating generation of data depicting location of said medical device in the acquired image in response to determining said at least a portion of said outline of said medical device.