Final answer:
Fog on a digital image receptor due to background radiation can cause increased noise, lower contrast, and exposure indicator number errors. These impacts are significant in the field of radiography, affecting the clarity and accuracy of radiographic images.
Step-by-step explanation:
The question posed deals with the effects of fog on a digital image receptor, which is a concern in radiographic imaging due to background radiation. In the context of radiography, fog refers to the exposure of the imaging plate to radiation, which can happen even without intentional exposure to a radiation source. This exposure can lead to increased noise in the image because there is an increase in the random variability of the pixel values. Lower contrast may also result as the fog creates a gray background, making it difficult to discern between different densities and structures in the image. Additionally, fog could lead to inaccuracies in the exposure indicator number, which is a value that represents the amount of radiation the digital image receptor was exposed to during the imaging process.
When considering these effects, the correct answer to the question "Fog on a digital image receptor, caused by background radiation, can result in which of the following: increased noise, lower contrast, exposure indicator number error" is D. 1, 2 & 3.