What does 'image lag' refer to in digital radiography?

The term 'image lag' in digital radiography specifically refers to the residual effect of a previous image that can still be observed in the current image. This phenomenon occurs when the detector does not completely discharge after capturing an initial exposure, resulting in a lingering image from that previous exposure that affects subsequent images. Image lag can lead to visual artifacts or misleading interpretations during diagnosis since it may confuse the radiologist by superimposing the effects of the earlier image over the new data.

Understanding this concept is crucial for ensuring accurate image interpretation and improving diagnostic accuracy. In practice, being aware of image lag encourages the implementation of proper techniques to minimize its effects, such as allowing for a sufficient recovery time between exposures or utilizing equipment designed to reduce lag effects.