In today's highly competitive market, it is vital to bring products from concept to production as rapidly as possible. As soon as a design is in production, it is essential to continually monitor performance, acquiring and interpreting data quickly and accurately so that any abnormalities can be corrected. For the x-ray tube, the focal spot is a key quality metric. Its length, width and superimposition determine the accuracy of a cathode cup design, the accuracy of filament setting and, ultimately, the quality of the x-ray image...