Which of the following factors does NOT affect patient exposure during radiological procedures?

The factor that does not affect patient exposure during radiological procedures is the use of a three-phase generator. The generator type primarily influences the efficiency and consistency of the X-ray production, leading to better image quality and potentially reduced exposure times. However, it does not directly relate to how much radiation a patient receives during a procedure.

In contrast, collimation is a critical factor that shapes the X-ray beam to include only the necessary area of interest, thereby minimizing unnecessary exposure to surrounding tissues. Target to panel distance is essential as well, since it can affect the intensity of the radiation beam that reaches the patient; as distance increases, the exposure typically decreases due to the inverse square law. Lastly, exposure time is another vital factor, directly correlating with the amount of radiation a patient is exposed to during the imaging process; longer exposure times result in higher doses. Thus, while all of these elements are important in radiological practices, the three-phase generator's role is more about performance rather than directly influencing patient exposure levels.