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A transverse view of six spherical lesions placed at a radial distance of 7-cm from the center of (a) 27-cm and (b) 35-cm diameter cylindrical phantoms. The two large spheres with diameters of 37 and 28-mm were filled with cold water. The four smaller spheres with diameters of 22, 17, 13, and 10-mm had an activity concentration of 6:1 with respect to the background.
