In other words, system SFR is equivalent to the product of the MTF of each component in the imaging system. SFR is more commonly associated with complete system response, where MTF is commonly associated with the individual effects of a particular component. Note : Imatest uses SFR and MTF interchangeably. In Figure 6, MTF is illustrated with sine and bar patterns, an amplitude plot, and a contrast plot-each of which has spatial frequencies that increase continuously from left to right. The relative contrast at a given spatial frequency (output contrast/input contrast) is called Modulation Transfer Function ( MTF ), which is similar to the Spatial Frequency Response (SFR), and is a key to measuring sharpness. High frequencies correspond to fine detail in the spatial and frequency domains
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