What is the final step in the energy conversion process of an image intensifier before displaying the image?

The final step in the energy conversion process of an image intensifier involves the transformation of the analog signal produced by the photomultiplier tubes into a digital signal. In an image intensifier, an initial x-ray is converted into light, and then that light generates an analog electrical signal. This analog signal must then be digitized to be processed, displayed, or stored electronically in various imaging systems. This digitization is crucial as it allows for more efficient manipulation and transmission of the image data, making it suitable for modern digital display systems.

In summary, the conversion from analog to digital signals is essential for utilizing the image in a digital context, which aligns with the final step before presentation. Other options involve earlier stages of energy conversion or processes that are not pertinent to the operation of image intensifiers.