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Spatial Resolution and Sampling Frequency in High-Resolution CR
Spatial resolution in Computed Radiography—the ability to distinguish between two small, high-contrast objects—is determined primarily by the sampling frequency of the reader and the phosphor crystal size.
Standard CR plates typically have a resolution of about 2.5 to 5 line pairs per millimeter ($lp/mm$). However, specialized "High-Resolution" CR plates used for mammography or fine extremity work utilize thinner phosphor layers and smaller crystal diameters to reduce light spread during the laser readout. The "pixel pitch" or the distance between the center of one pixel and the next is also a limiting factor. As the laser spot size decreases, the sampling frequency increases, leading to a higher Nyquist Frequency. By 2026, advanced "needle-structured" phosphors ($CsI$) have been adapted for some CR applications, significantly improving the spatial resolution beyond traditional granular powder phosphors.
