How is the anode in an X-ray tube different from the cathode?

In an X-ray tube, the anode plays a crucial role in the production of X-rays by serving as the target for electrons emitted from the cathode. When the electrons, which are generated by the cathode, are directed towards the anode, they collide with it, resulting in the production of X-rays through a process known as Bremsstrahlung and characteristic radiation. This interaction converts the kinetic energy of the electrons into X-ray photons, which are then emitted and contribute to the formation of the X-ray image.

The other options do not accurately describe the anode's function. The anode does not create the X-ray image itself, as that is the result of the interaction between the X-rays and the imaging system or detector. While filtration of the X-ray beam is essential for reducing patient dose and improving image quality, this function is typically performed by a separate component, not the anode. Additionally, the source of electrons is actually the cathode, which emits electrons due to thermionic emission, not the anode. Thus, the anode's primary role is to act as the target for these electrons, making option B the correct choice.