The effect of filtration in fluoroscopy primarily leads to an increase in:

Filtration in fluoroscopy serves a crucial purpose by allowing the more energetic x-ray photons to penetrate through the patient's body while absorbing lower-energy photons. This process leads to an overall increase in the average energy of the x-rays that ultimately contribute to the imaging. The lower-energy x-rays are less able to penetrate tissue and are primarily responsible for increasing radiation dose without contributing positively to image quality.

By removing these less energetic photons, filtration enhances image quality for a given dose of radiation. Higher-energy x-rays are more efficient at creating images because they provide better penetrability and reduce patient dose overall. Thus, the average energy of the x-ray beam is increased as a direct result of the filtration process, leading to improved diagnostic efficiency and patient safety.