What mechanism optically couples the image intensifier with a TV camera?

The mechanism that optically couples the image intensifier with a TV camera involves a lens system. In fluoroscopy, the image intensifier is used to enhance the brightness of the image produced by the X-ray beam, converting it into a visible image. The lens system plays a crucial role in this process by focusing the output of the image intensifier onto the sensor of the TV camera.

This lens system ensures that the image is properly aligned and magnified, allowing for high-quality video imaging. It also facilitates the transfer of light from the image intensifier to the camera, maintaining image fidelity and clarity, which is essential for accurate diagnosis and monitoring.

Other mechanisms mentioned, such as the camera control unit or mirror system, do not serve the primary function of optical coupling between these two components, while the amplifier system relates more to signal processing rather than the initial optical connection needed to form an image for the TV camera. Thus, the lens system is the correct mechanism for the optical coupling in this context.