Physical Measures of Image Quality in Photostimulable Phosphor Radiographic Systems Physical measures of image quality in photostimulable phosphor radiographic systems Ehsan Samei, Michael J. Flynn, and David A. Reimann International Symposium on Medical Imaging 1997 . 22-28 February 1997. The wide dynamic range and image processing capabilities associated with PSP systems have particular significance.
Systems are now available that support different screen thicknesses with various pixel sizes.
The radiograph of the edge was processed to obtain the presampled MTF in the direction perpendicular to the edge. The NPS of the systems at different input exposures was determined by 2D Fourier analysis of uniformly exposed screens. Using comparable screen and pixel sizes, the measured MTF of the systems from different manufacturers are similar. Maintaining the same pixel size, for a given PSP system, high resolution screens offer improved MTF response over a wide frequency range with an increase in the NPS due to their reduced sensitivity compared to regular screens. Although PSP systems are being widely used in radiographic applications, their image quality in terms of quantitative measures of performance has not been fully assessed.