Abstract: A new scanning method and device for matrix panel display for using electron beam to scan comprising the steps: connecting each anode of dc matrix display panel to the display supply's anode via a switch cell whose status is controlled by electron beam, using one electron beam to irradiate to some anode; using another electron beam to irradiate to some cathode of the display panel; thereby selecting the unique display cell at the intersection of anode and cathode to light up; deflecting both beams accordingly to implement two-dimensional addressing; and adjusting beam current of the irradiating cathode to achieve image gray scale adjustment.

Abstract: Apparatus includes a mobile stand supporting a photographic assembly having a camera photographing through a light at pre-set and fixed apparatus-to-patient distance establishing a constant photographic environment, in minimal space. The photographic assembly includes a means to mount a 90 degree rotatable camera body about an axis perpendicular to the film plane whereby subjects can be photographed on either a horizontal or vertical format. An adaptor sleeve is mounted on a zoom lens and, in conjunction with a motor and friction drive mechanism, move the zoom lens coaxial with the optical axis to compensate for and to bring, varying weight/mass differences between patients, into uniform image size. A mobile stand mounts the assembly between upright stanchions to compensate for varying height differences between patients into uniform image size.