What is the purpose of a photomultiplier tube in fluoroscopy?

The purpose of a photomultiplier tube in fluoroscopy is to convert light into electrical signals. In fluoroscopic systems, when x-rays interact with a fluorescent material (typically in the image intensifier), they produce visible light. The photomultiplier tube then detects this light and converts it into an electrical signal that can be further processed to create images. Through this process, the system is able to amplify the light signal, enhancing the quality of the image that is ultimately displayed. This function is crucial because it allows for the visualization of x-ray images in a manner that is sensitive to even low levels of radiation, improving the overall efficiency and effectiveness of fluoroscopy in clinical settings.