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The S value in radiology refers to the sensitivity number associated with digital radiography systems, specifically in relation to the exposure of the imaging plate. It is part of a logarithmic scale where lower S values indicate higher sensitivity and, therefore, lower exposure is required to produce an image of adequate quality. Typically, an S value of around 200 is considered optimal, with values significantly lower indicating overexposure and higher values indicating underexposure. This metric helps radiologists optimize their imaging techniques for patient safety and image quality.

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