What does kVp control in fluoroscopy?

Kilovoltage peak (kVp) primarily influences both the quality and quantity of radiation produced during fluoroscopy. When kVp is increased, the energy of the X-ray photons is higher, which means that the quality of the radiation improves. Higher energy photons are more likely to penetrate tissues without being absorbed, thus enhancing image detail and contrast.

In addition to improving quality, increasing kVp also affects the quantity of radiation. A higher kVp results in a higher number of X-ray photons being produced, which leads to an increase in radiation exposure to the detector or the film, thereby altering the overall quantity of radiation emitted.

Thus, when considering the dual impact of kVp on both the penetrating ability (quality) and intensity (quantity) of the X-ray beam, it becomes evident why this answer encompasses both aspects of radiation control in fluoroscopy.

Other options suggest a limitation either to quality alone, quantity alone, or exposure time, which does not represent the comprehensive role of kVp in determining the characteristics of the X-ray beam during fluoroscopic examinations.