An imaging system 10 is provided comprising an x-ray source 12, a detector 14, and an alignment device 38 adapted to align the detector 14 with the x-ray source 12 using an x-ray beam transmitted from the x-ray source 12. The method comprises following steps. The light is transmitted or totally reflected from the surfaces according to an angle of incidence at which the light falls on the prism unit. A latch actuator is mounted on the mullion at a selected position vertically spaced apart from the latch arm, and includes a slide which shifts between latched and unlatched positions. The combination of first and second fingers means that the EMI shield can be located in the aperture in a removable manner without the use of tools. Furthermore, if the copper traces are breaking up in a predetermined location, the planar inductance becomes a transformer.