A radiographic image with an S value significantly above the normal range signals which issue?

A radiographic image with an S value significantly above the normal range signals which issue?

• A. Insufficient receptor exposure
• B. Excessive receptor exposure
• C. Under-contrast image
• D. Over-contrast image

Answer: (A)

S value reflects how much radiation reached the image receptor, and it is inversely related to receptor exposure. When the S value is significantly above normal, it means the detector received too little exposure—that is, underexposure. This results in a darker, noisier image with low density and potentially poorer visualization of detail. The S value doesn’t directly measure contrast, so a high S value points to insufficient receptor exposure rather than under- or over-contrast. To fix it, increase the exposure to bring the S value back into the normal range for that exam.

S value reflects how much radiation reached the image receptor, and it is inversely related to receptor exposure. When the S value is significantly above normal, it means the detector received too little exposure—that is, underexposure. This results in a darker, noisier image with low density and potentially poorer visualization of detail. The S value doesn’t directly measure contrast, so a high S value points to insufficient receptor exposure rather than under- or over-contrast. To fix it, increase the exposure to bring the S value back into the normal range for that exam.