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• W2111036114 startingPage "2473" @default.
• W2111036114 abstract "Lag in fluoroscopic systems introduces a frame-averaging effect that reduces measurements of image noise and incorrectly inflates measurements of the detective quantum efficiency (DQE). A correction can be implemented based on measurements of the temporal modulation transfer function (MTF). We introduce a method of measuring the temporal MTF under fluoroscopic conditions using a moving slanted edge, a generalization of the slanted-edge method used to measure the (spatial) MTF, providing the temporal MTF of the entire imaging system. The method uses a single x-ray exposure, constant edge velocity, and assumes spatial and temporal blurring are separable. The method was validated on a laboratory x-ray image intensifier (XRII) system by comparison with direct measurements of the XRII optical response, showing excellent agreement over the entire frequency range tested (+/- 100 Hz). With proper access to linearized data and continuous fluoroscopy, this method can be implemented in a clinical setting on both XRII and flat-panel detectors. It is shown that the temporal MTF of the CsI-based validation system is a function of exposure rate. The rising-edge response showed more lag than the falling edge, and the temporal MTF decreased with decreasing exposure rate. It is suggested that a small-signal approach, in which the range of exposure rates is restricted to a linear range by using a semitransparent moving edge, would be appropriate for measuring the DQE of these systems." @default.
• W2111036114 created "2016-06-24" @default.
• W2111036114 creator A5029835571 @default.
• W2111036114 creator A5044895020 @default.
• W2111036114 date "2008-05-23" @default.
• W2111036114 modified "2023-10-05" @default.
• W2111036114 title "A moving slanted-edge method to measure the temporal modulation transfer function of fluoroscopic systems" @default.
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• W2111036114 doi "https://doi.org/10.1118/1.2919724" @default.
• W2111036114 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18649480" @default.
• W2111036114 hasPublicationYear "2008" @default.
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