You have just taken a CR radiograph of a patient's knee and the S# is 225.Unfortunately, the image has some degree of motion distortion and needs to be repeated using the same exposure settings.In repeating the image, the new image shows no motion but the S# is now 400.No changes were made to collimation, patient position, exposure techniques, etc.Based upon this new S# value,

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Quizplus · Accepted Answer

CThe S# (Sensitivity Number) in CR imaging is inversely proportional to the amount of exposure the plate received; a higher S# indicates lower exposure. The change from 225 to 400, despite no changes in exposure settings, suggests an issue with exposure reproducibility (A), but since no specific tolerable limits are provided, it could also be interpreted that the exposure reproducibility is within tolerable limits given the nature of clinical practice (C).

You Have Just Taken a CR Radiograph of a Patient's