Dr. Stewart reminds us that Xeroradiography—which, unlike digital radiography, was a fad—was an early form of filmless imaging. However, Xeroradiography, like film and the original photocopy technology on which it was based, was an analog technique.
It used a charged selenium-coated plate to create a latent image that was then converted to a real image by the deposition of toner particles. These particles then were transferred to an adhesive strip to which a translucent backing was affixed. Xeroradiography did not use solid-state sensors, nor did it store the images as numerical data; therefore, Xeroradiography does not qualify as digital radiography, even though it was a filmless technology.
