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Fig. 3. —Photograph of Ultraguide (Ultraguide 1000; Ultraguide, Lakewood, CO) monitor during 20-gauge needle biopsy of simulated lesion using freehand sonography with computer guidance. Black arrow indicates biopsy needle tip in 10-mm target at depth of 7 cm. Computer-generated solid lines localize needle and needle tip during freehand approach. Note mirror-image sonography artifact resulting in second lesion posterior to target lesion (open arrow).