Which factor causes quantum mottle on a radiograph?

Which factor causes quantum mottle on a radiograph?

• A. Inadequate receptor exposure
• B. Incorrect post-processing
• C. Small matrix size
• D. Excessive receptor exposure

Answer: (A)

Quantum mottle shows up as a grainy texture on the image because there aren’t enough photons hitting the detector. When exposure is inadequate, photon counts are low, and the random fluctuations in how many photons arrive at different pixels become visible as noise. Increasing receptor exposure raises the photon fluence, improves the signal-to-noise ratio, and reduces this graininess, without necessarily changing the fundamental image details if done within safe dose limits. Post-processing and matrix size don’t create or eliminate quantum mottle in the same way. Post-processing changes can alter appearance, but the grainy look mainly comes from photon statistics, not software. A small matrix size reduces spatial resolution, not the quantum noise related to photon counts. Excessive receptor exposure increases dose and can wash out contrast or saturate the image, but it doesn’t cause grainy quantum mottle—in fact, it tends to reduce visible noise by increasing photon counts.

Quantum mottle shows up as a grainy texture on the image because there aren’t enough photons hitting the detector. When exposure is inadequate, photon counts are low, and the random fluctuations in how many photons arrive at different pixels become visible as noise. Increasing receptor exposure raises the photon fluence, improves the signal-to-noise ratio, and reduces this graininess, without necessarily changing the fundamental image details if done within safe dose limits.

Post-processing and matrix size don’t create or eliminate quantum mottle in the same way. Post-processing changes can alter appearance, but the grainy look mainly comes from photon statistics, not software. A small matrix size reduces spatial resolution, not the quantum noise related to photon counts. Excessive receptor exposure increases dose and can wash out contrast or saturate the image, but it doesn’t cause grainy quantum mottle—in fact, it tends to reduce visible noise by increasing photon counts.