What is the main function of the output phosphor in an image intensifier?

The main function of the output phosphor in an image intensifier is to amplify the image brightness. After the input phosphor absorbs x-ray radiation and converts it into light, this light is directed toward the output phosphor. The output phosphor is typically composed of materials like cesium iodide or zinc sulfide, which efficiently convert the incoming light into visible light while also significantly increasing the brightness of the image. This amplification of brightness is critical for enhancing image quality in fluoroscopic procedures, as it allows for better visualization of internal structures with lower radiation exposure.

The effectiveness of the output phosphor contributes to the overall performance of the image intensifier by increasing the intensity of the images displayed on the monitor or screen, thereby facilitating real-time imaging and assessment during medical procedures.