A medical viewing system with an X-ray image acquisition device for acquiring angiograms and interventional live images of vessels is adapted for generating a region of interest border into which an object referenced by an object-based registration process must extend in order to achieve an accurate registration of vessel trees extracted from the angiogram and the live images. The metal frame includes two sections that fold together at two hinges. These issues may be caused by lack of spatial separation in the received MIMO communications signals. Also featured is a method of using the device to remove a substance from liquid by adsorption andor ion exchange. The diameter of the bore essentially corresponds to the diameter of the seat. This invention further relates to methods for producing maize varieties derived from maize variety X13B645.