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Fig. 2A. —Use of "Dust & Scratches" filter and "History Brush." Original sonogram (Figs. 1A, 1B, 1C) shows multiple dust particles overlying ventricles. "Dust & Scratches" filter is selected by clicking "Filter" menu bar (Filter Noise Dust & Scratches) as shown in upper left corner. "Dust & Scratches" dialogue window is shown in lower left. Note "Radius" and "Threshold" settings are at left end of slider bar (arrows). (Fig. 2 continues on next page)