Which factor does NOT affect the patient dose?

The focal spot size does not directly affect the patient dose during radiographic imaging. Patient dose is primarily influenced by the amount of radiation exposure that the patient receives, which is dictated by factors like kilovolt peak (kVp), milliamperes per second (mAs), and the source-to-image distance (SID or FFD).

kVp affects the energy of the x-ray photons generated, influencing the penetration ability of the x-rays and the overall dose received by the patient. Higher kVp settings typically decrease the patient dose because they increase the quality of the x-ray beam, allowing for lower mAs settings to still provide adequate imaging.

mAs directly relates to the quantity of x-rays produced during an exposure. Higher mAs means more x-ray photons are generated, resulting in a higher dose to the patient.

SID, or the distance between the radiation source and the imaging receptor, also affects patient dose. Increasing the SID reduces the intensity of the x-ray beam that reaches the patient, thereby reducing the dose, while decreasing the SID increases the dose.

In contrast, the focal spot size pertains to the physical size of the area on the x-ray tube anode that is bombarded by the electron beam. While it can impact image quality