Contrast And Spatial Resolution Practice Test

What does SNR tell us about an image?

The ratio of signal to noise; higher SNR means more reliable visualization of detail and improved detectability. The ratio of background to signal. The frequency content of the image. The density of data in storage.

Correct Answer:

The ratio of signal to noise; higher SNR means more reliable visualization of detail and improved detectability.

Explanation:

Signal-to-noise ratio in an image tells you how strong the true image signal is compared to random noise. When SNR is high, the signal stands out from the noise, so details are clearer and features are easier to detect. This concept isn’t about how much background there is relative to the signal, nor about the image’s frequency content, nor about how much data storage is needed.

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