1. A method of medical imaging, comprising the steps of: transmitting X-ray emissions originating from a first source through a subject; generating a first set of temporally separated images of an area of interest in the subject from the transmitted X-ray emissions; generating a second set of temporally separated images from the area of interest in a second source; combining the first set and the second set to produce combined images of the area of interest; blocking the X-ray emissions from reaching the subject; updating the second set; combining the first set with the updated second set to produce updated combined images of the area of interest; displaying the updated combined images; and when a predetermined condition is satisfied, iterating the steps of updating the second set, combining the first set with the updated second set and displaying the updated combined images, and when the predetermined condition is not satisfied discontinuing blocking the X-ray emissions from reaching the subject, and again performing the step of generating a first set to produce a new first set, and thereafter iterating the steps of blocking the X-ray emissions, updating, combining the first set with the updated second set using the new first set as the first set.