![]() The MTF of the scanner alone was obtained by scanning an optical test target and the MTF of the XLV/scanner system was measured using x rays. The model was validated by experiments on a prototype XLV/scanner system. From these component MTFs, the theoretical MTF of the XLV is derived. A theoretical model of spatial resolution of an XLV is presented based on calculations of the modulation transfer function (MTF) for a-Se and a LC cell. ![]() Here, the effect of each component on the spatial resolution of an XLV/scanner system is investigated. The XLV/scanner system consists of an XLV in combination with an optical scanner for image readout. ![]() ![]() The XLV consists of an a-Se layer and LC cell in a sandwich structure which produces an optical image in the LC layer upon x-ray exposure. The XLV/scanner concept combines three well-established, and hence, low-cost technologies: An amorphous selenium (a-Se) layer as an x-ray-to-charge transducer, a liquid crystal (LC) cell as an analog display, and an optical scanner for image digitization. An x-ray light valve (XLV) coupled with an optical scanner has the potential to meet the need for a low-cost, high quality digital imaging system for general radiography. ![]()
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