Which factors influence the quantity of scatter radiation?

The quantity of scatter radiation in radiography is influenced by a variety of factors, which include both the kilovoltage peak (kVp) and part thickness, as well as field size and tissue density.

When kVp is increased, the energy of the X-rays increases, which leads to a greater likelihood of interactions with the atoms in the material being imaged. This results in an increase in scatter radiation. Part thickness also plays a significant role because thicker parts of the body will absorb more radiation and cause more scatter due to the denser material.

Field size affects scatter radiation as well; a larger field size exposes more tissue to the primary beam, producing more scatter. Additionally, tissue density significantly impacts the amount of scatter produced. Denser tissues have a greater number of electrons which can interact with the X-ray photons, thereby increasing scatter production.

Since both groups of mentioned factors—kVp with part thickness and field size with tissue density—affect scatter radiation, the correct answer encompasses all of these influences, confirming that "all of the above" are factors that influence the quantity of scatter radiation.