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A digital x-ray imaging system was designed for small-animal studies. This system is a fiber-optics taper-coupled imaging system with two CCD arrays uniquely jointed. The x-ray source of the system has a small focal spot of 20 µm. This digital imaging system contains specially designed shelves to provide magnification levels, ranging from 1.5× to 5×. The system is characterized in terms of its properties of spatial resolution. An observer-based spatial resolution measurement was conducted with a line-pair target and a sector test pattern. The modulation transfer function of the system, with different magnifications, was studied by use of a 10-µm lead slit. The average resolutions at 50% and 5% modulations at 1× magnification were measured as 3.9 and 8.4 lp/mm, respectively, where lp indicates line pairs. With 5× magnification, the 50% and the 5% modulations provided 13.2- and 29.9-lp/mm, respectively, average spatial resolutions. The measurements showed consistency between the two individual CCD arrays; the difference in resolution between the two CCDs is less than 1%, even at high magnifications.
© 2002 Optical Society of America
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