Which layer of the CR imaging plate is responsible for creating the latent image from the transmitted x-ray photons exiting the patient?

The phosphor layer of the CR imaging plate is responsible for creating the latent image from the transmitted x-ray photons exiting the patient. This layer contains photostimulable phosphors, commonly barium fluorohalide, which absorb the x-ray energy and store it as a latent image. When the x-ray photons hit this layer, they excite the electrons within the phosphor material, causing them to be trapped in higher energy states.

Later, when the imaging plate is stimulated by a laser during the reading process, these trapped electrons return to their ground state, releasing energy in the form of visible light. This emitted light is then detected and converted into an electronic signal to create the digital image.

The other layers of the imaging plate serve different functions: the protective layer safeguards the phosphor layer from physical damage and contamination, the backing layer provides structural support and helps transport the imaging plate in and out of the CR system, and the conductive layer drains away any static charge that may interfere with image quality. However, these layers do not play a role in the formation of the latent image from the x-ray photons.