Which factor does NOT typically affect image quality in radiography?

Patient ethnicity does not typically affect image quality in radiography, as image quality is primarily influenced by technical factors related to the imaging process. While the physical characteristics of a patient's body, such as size and composition, can impact how x-rays interact with tissues and thus affect image quality, ethnicity itself is not a relevant factor in determining the clarity or quality of radiographic images.

In contrast, patient positioning is crucial because improper alignment can lead to images that are not diagnostically useful. Exposure time impacts image quality by influencing the amount of radiation the image receptor receives, which can contribute to the sharpness and density of the final image. Additionally, the radiation dose is important, as both under-exposure and over-exposure can negatively affect image quality; under-exposure can result in a grainy image while over-exposure can lead to loss of detail.