Receptor exposure is affected by which of the following?

Receptor exposure is influenced by multiple factors in radiography. Filtration, which is the correct choice in this context, relates to the removal of low-energy photons from the x-ray beam. This process is critical because low-energy photons do not contribute significantly to the image quality, as they are more likely to be absorbed by the patient’s body rather than reaching the imaging receptor. By selectively filtering these energies out, the overall quality of the beam is improved, effectively enhancing the receptor's exposure to high-energy photons that penetrate the patient and contribute to the resultant image.

When filtration is increased, it can reduce the overall receptor exposure if not compensated by increasing the radiation dose, as fewer photons reach the imaging receptor. This complex relationship underscores the importance of understanding how filtration directly impacts receptor exposure within the framework of image quality and patient safety.

Other factors mentioned like exposure time influence the amount of radiation received but do not alter the characteristics of the x-ray beam itself. Similarly, film speed refers to the sensitivity of the imaging receptor to radiation, and grid ratio pertains to the amount of scatter radiation removed, which can improve image quality but does not directly affect receptor exposure in the same way filtration does.