The scanner employs a VRX detector, which provides increased spatial resolution by matching the scanner’s field of view (FOV) to the size of an object being imaged. The detector presampling MTF of a 576-channel variable resolution x-ray (VRX) CT scanner was evaluated in this study. Modeling and measurement of the detector presampling MTF of a variable resolution x-ray CT scanner The obtained results are important for further development of the VRX CT scanner. At small FOVs (1-8 cm), the MTF measurements were limited by the size of the focal spot. Some discrepancies between the measured and the modeled detector presampling MTFs can be explained by the limitations of the model. The experimental results are in reasonable agreement with the theoretical data. The theoretical results show the increase in the cutoff frequency of the detector presampling MTF from 1.39 to 43.38 cycles/mm as the FOV of the VRX CT scanner decreases from 32 to 1 cm. The scanner's pre-reconstruction spatial resolution, represented by the detector presampling MTF, was evaluated using both modeling (Monte Carlo simulation) and measurement (the moving slit method). Because spatial resolution is the parameter the scanner promises to improve, the evaluation of this resolution is important. ![]() The scanner employs a VRX detector, which provides increased spatial resolution by matching the scanner's field of view (FOV) to the size of an object being imaged. The detector presampling modulation transfer function ( MTF) of a 576-channel variable resolution x-ray (VRX) computed tomography (CT) scanner was evaluated in this study. ![]() Modeling and measurement of the detector presampling MTF of a variable resolution x-ray CT scanner.
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