A lightweight, compact image projection system, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality or higher in color. The second side has an outer perimeter portion and a first peripheral surface, the first peripheral surface being inward of the outer perimeter portion. The inner lens bracket to which the LED mounting substrates are attached can further be attached to the inner panel so that the bracket portions accommodating the LEDs protrude from the bracket portion insertion holes of the inner panel. The diagnosis of viral illness is made through the use of results obtained from an enterovirus polymerase chain reaction test or a direct fluorescent assay test for respiratory viruses.