The output phosphor of an image intensifier tube is how many times brighter than the input phosphor?

The output phosphor of an image intensifier tube is significantly brighter than the input phosphor due to the mechanism of image intensification. When x-rays enter the input phosphor, they are converted into visible light. This light is then directed toward the output phosphor, which further amplifies the light intensity.

The increase in brightness is a result of the conversion process and the design of the image intensifier. The output phosphor can enhance the light intensity thousands of times greater than what is produced by the input phosphor. This characteristic allows for better visualization of the internal structures being examined, especially in fluoroscopic imaging, where low levels of radiation might otherwise limit image quality.

The correct answer, indicating that the output phosphor is in the thousands compared to the input phosphor, accurately reflects this dramatic increase in brightness, which is essential for effective imaging in medical diagnostics.