Scanning X-ray imaging systems provide significant reduction in the detected scatter radiation, cover large areas, and potentially offer high spatial resolution. Applications of one dimensional (1D) gaseous detectors and 'edge-on' illuminated silicon strip detectors for scanning slit imaging systems are currently under intensive investigation. In this work we investigate an 'edge-on' illuminated Porous Plate (PP) detector concept for applications in diagnostic X-ray imaging. As opposed to the existing X-ray imaging detectors, 'edge-on' PP detectors can provide a combination of high stopping power, high physical charge amplification, superior spatial resolution and flexible pixel shape. One common type of PP is Microchannel Plate (MCP). It has previously been investigated as a detector in surface-on illumination mode for medical X-ray imaging. However, its detection efficiency was determined to be too low for medical imaging applications. Using 'edge-on' illumination mode for MCPs with optimized structural parameters, it is possible to reach high detection efficiency. The characteristics of 'edge-on' MCP detectors are compared with the currently available X-ray imaging detectors. Possible use of other PP materials such as Porous Dielectrics, Microspheric Plates, a-Si based MCPs, Micro columnar and Micro granular Dielectrics are discussed. An 'edge-on' illuminated MCP detector for scanning X-ray imaging system is being developed in our laboratory. The details of this system and the read out electronics will be described.