What factor controls the speed of electrons traveling from the cathode to the anode in radiography?

The speed of electrons traveling from the cathode to the anode in radiography is primarily controlled by kilovolt peak (kVp). kVp is the measure of electrical potential difference that accelerates the electrons within the X-ray tube. A higher kVp means a greater potential difference, which in turn increases the velocity of electrons as they are drawn from the cathode to the anode. This acceleration leads to higher energy X-ray photons being produced, resulting in enhanced penetration capability and image quality.

In practical terms, adjusting kVp effectively modifies the energy of the X-rays generated, influencing both the contrast and penetration of the radiographic image. This makes it an essential parameter for optimizing image quality in radiographic procedures.

Milliamperage, while important for controlling the quantity of X-rays produced, does not directly influence the speed of the electrons. The time of exposure affects the duration but not the speed at which electrons travel. Film sensitivity relates to how well the imaging receptor captures the X-ray exposure but does not influence the electron dynamics in the tube itself.