Which factor does NOT directly affect radiographic definition?

Radiographic definition, which refers to the visibility of details in an image, is influenced by several factors. The correct choice indicates a factor that does not have a direct impact on this aspect.

Milliampere-seconds (mA) primarily influences the density of an X-ray image, as it controls the quantity of radiation produced. While density can indirectly affect the perceived sharpness or clarity of an image, it does not directly correlate with the definition or the visibility of fine details present in the radiograph.

In contrast, kilovoltage peak (kVp) affects both the quality and the penetration power of the X-ray beam, which is critical for obtaining clearer images with better definitions. Object thickness determines the degree of attenuation of the X-ray beam as it passes through an object, impacting the contrast and visibility of details. Film speed, which indicates the sensitivity of the film to radiation, can also influence the sharpness and resolution of the final image.

Thus, while mA plays an important role in the overall quality of the radiograph, it does not directly affect the definition in the same way that the other factors do.