In certain embodiments, a method of maintaining health of a patient uses an analyte detection system. As a consequence, the necessary residence time in the reactor and thus the length of the reactor are reduced and the formation of polymeric by-products which lead to caking in the reactor and a shortening of the operating period of the reactors is avoided. The arteriographic image sequences maybe obtained from a biplane imaging system or from two sequences of images using a single plane imaging system. The hollow chamber can fill with molten metal to form a core that aids in orienting the body in a narrow end downward position. The invention also includes various slurry embodiments. Thus, outgoing angles of the audio beams can be set in optimum positions in accordance with the shape of a room or the installation position where the speaker array apparatus is installed.