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Figure 3


Fig. 1C —Radiographic study of universal laser printer film. Four quadrants were labelled by wire fixed to film for better radiologic visualization. Quadrant I contains round (class of number, 3; class of size, 3), quadrant II contains round (class of number, 3; class of size, 3), and quadrant IV contains round (class of number, 3; class of size, 2) particles; quadrant III contains no silicate particles. Number of microcalcifications was characterized as follows: class 0, no microcalcifications; 1, 1-4 microcalcifications; 2, 5-9 microcalcifications; 3, 10-19 microcalcifications; 4, 20-39 microcalcifications; or 5, > 39 microcalcifications. Diameter classes were class 1, 100-199 µm; 2, 200-399 µm; 3, 400-599 µm; and 4, 600-800 µm. Digital film image.