The Modulation Transfer Function (MTF) evaluates the:

• A. Efficiency of the photons being absorbed by the detector
• B. Ability to visualize a change in brightness between adjacent areas
• C. Ability of the system to transfer the information into the image
• D. Accuracy of the kilovoltage peak (kVp) selected on the control panel

Answer: (C)

MTF measures how faithfully the radiography system transfers the object’s detail into the final image. It describes the system’s ability to preserve contrast at different spatial frequencies, so edges and fine structures remain sharp in the image. A high MTF means the image closely represents the true detail, while a dropping MTF shows increasing blur as detail gets finer. This is different from how many photons are absorbed by the detector (detector efficiency) or simply noticing brightness differences between neighboring areas (contrast visibility), and it’s not about whether the kVp setting is correct (an exposure control issue).