1. An imaging system comprising: a rotatable gantry with a bore for receiving an object to be scanned; an x-ray source attached to the gantry; a generator attached to the gantry configured to energize the x-ray source to generate x-rays; a detector attached to the gantry, positioned to receive the x-rays; and a computer programmed to: obtain knowledge of metal within the object, wherein the knowledge obtained of the metal includes a type of metal and a position of the metal; instruct the system to perform a scan of the object, using system scanning parameters based on the obtained knowledge, to generate scan data; reconstruct an image of the object from scan data using a reconstruction algorithm automatically selected based on the type of metal.