Which of the following factors does NOT contribute to patient radiation exposure during a procedure?

The factor that does not contribute to patient radiation exposure during a procedure is room lighting conditions. This is because lighting within the examination room does not affect the amount of radiation emitted by the x-ray tube or the patient's exposure to that radiation.

In contrast, the film-screen system plays a significant role in the efficiency of image capture, where a less effective system might require higher radiation doses to achieve adequate imaging. The distance from the x-ray tube is essential because the inverse square law dictates that increasing the distance results in a decrease in radiation exposure to the patient. Finally, the patient’s body habitus can influence the amount of radiation required to penetrate different body types effectively. Thus, room lighting conditions are unrelated to the radiologic procedure's radiation exposure aspect.