Modulation transfer function (MTF) measurement of CdZnTe detectors for digital radiography and computed tomography

In this study, dependence of the temporal modulation of a Cd/sub 1-x/Zn/sub x/Te detector, operated under scanning beam geometry, of both the applied electric field and detector thickness, at each frequency of a scanning square-wave test pattern, have been measured. The experimental arrangement, although is not offered for large field-of-view imaging applications, offers potential capabilities for feasibility studies, research and evaluation of the temporal response and noise characteristics of a Cd/sub 1-x/Zn/sub x/Te detector, for fast digital radiographic and computed tomographic (CT) applications. The experimental results indicate a system spatial resolution of >8 cy/mm. Currently, efforts are aimed at improving the imaging potential of the experimental detector system, by optimizing system geometry as well as by increasing the temporal response of the overall system.