Out of the listed spatial frequencies, which would represent the highest Modulation Transfer Function (MTF) score?

Out of the listed spatial frequencies, which would represent the highest Modulation Transfer Function (MTF) score?

• A. 1 lp/mm
• B. 4 lp/mm
• C. 7 lp/mm
• D. 9 lp/mm

Answer: (A)

The Modulation Transfer Function (MTF) tells us how well an imaging system preserves contrast at different levels of detail, i.e., spatial frequencies. The curve typically starts high at very low frequencies (broad structures) and decreases as frequency increases, because reproducing fine detail with accurate contrast is more challenging for the system. So, among the given options, the lowest spatial frequency (1 lp/mm) will have the highest MTF since the system can maintain contrast best for coarse patterns. The higher frequencies (4, 7, 9 lp/mm) correspond to finer detail, where the system’s ability to reproduce contrast diminishes, yielding lower MTF values.

The Modulation Transfer Function (MTF) tells us how well an imaging system preserves contrast at different levels of detail, i.e., spatial frequencies. The curve typically starts high at very low frequencies (broad structures) and decreases as frequency increases, because reproducing fine detail with accurate contrast is more challenging for the system. So, among the given options, the lowest spatial frequency (1 lp/mm) will have the highest MTF since the system can maintain contrast best for coarse patterns. The higher frequencies (4, 7, 9 lp/mm) correspond to finer detail, where the system’s ability to reproduce contrast diminishes, yielding lower MTF values.