The composite measure of image accuracy compared to the original object, on a scale of 0 to 1 is referred to as?

• A. Dynamic range
• B. Signal-to-noise ratio
• C. Modulation Transfer Function
• D. Contrast resolution

Answer: (C)

The concept being tested is how faithfully an imaging system preserves detail and contrast across different sizes of features, quantified by the Modulation Transfer Function. The MTF describes how the contrast of image features at varying spatial frequencies is transferred from the object to the image. On a 0 to 1 scale, an MTF of 1 means perfect transfer with no loss of contrast, while values below 1 indicate degradation due to blur, diffraction, or aberrations. This makes it the best choice for describing a single composite measure of image accuracy relative to the original object. Other terms don’t capture this across all spatial details: dynamic range refers to the span of brightness levels, signal-to-noise ratio compares signal to noise, and contrast resolution relates to the smallest detectable brightness difference at a point, not a overall fidelity metric.