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. Author manuscript; available in PMC: 2009 Sep 14.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2009;7258:72584R. doi: 10.1117/12.813533

Figure 1.

Figure 1

Standard NEMA XR-21 phantom. Top left shows individual plates of the phantom; light circles on the plates are the aluminum cylinders; darker circles are holes passing through the entire plate. RSW stands for rotating spoke wheel. Top right shows the experimental setup. The 20 cm size phantom is placed in the field of view. The x-ray source is under the table. In the lower pictures, there are different configurations of the phantom to account for various situations, such as extremities, child thorax, adult thorax, large adult thorax, and x-ray maximum output. The plate numbers correspond to the numbers in the NEMA standard, and the plate types are shown in the top-left picture