Which statements about the image quality problem called "lag" are true?

The correct statement regarding the image quality problem known as "lag" is that it occurs due to image build-up time. Lag in imaging systems refers to a delay in the display of images following a change in the scene being captured. This phenomenon is particularly notable in systems that use certain types of video cameras, where there is an inherent delay in the processing and display of the image, due to the time it takes for the sensor to capture and forward the new information.

In a fluoroscopic context, when the scene changes and the television camera captures a new image, the previous image may still have residual light and information, leading to a blurred or ghosting effect in the output. This is primarily because the imaging system retains some previous information while gradually transitioning to capture the new image, thus creating a lag in the visual output that can affect diagnostic quality.

While the other statements touch upon various aspects of imaging technology and potential factors that can influence image quality, they do not directly encapsulate the concept of "lag" as accurately as this one does. Understanding the mechanics behind image build-up time is crucial for addressing and mitigating lag in fluoroscopic imaging.