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18 March 2008 Performance assessment of a simple and accurate grid alignment aid for portable chest imaging
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An x-ray anti-scatter grid alignment aid has been developed and its performance evaluated for portable chest radiographic exams. The grid alignment aid consists of one line laser and one cross-hair laser mounted on a supporting frame. During an x-ray exam, the two lasers generate a predetermined light pattern on the x-ray collimator to indicate the optimal x-ray source position in the three-dimensional (3D) space. Two grids commonly used in portable chest exams (40 lp/cm resolution, 6:1 and 8:1 ratio, and 130 cm focal distance) were characterized in terms of the signal-to-noise ratio improvement factor (SIF), as a function of the source image distance (SID), and x-ray tube lateral displacement from which the optimal grid operation range was determined. Data indicated the grid alignment aid was able to provide sufficient accuracy for positioning the x-ray tube to achieve optimal grid usage.
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Xiaohui Wang, Weidong Huang, David H. Foos, and Michael K. Rogers "Performance assessment of a simple and accurate grid alignment aid for portable chest imaging", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69133N (18 March 2008);

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