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Fig. 2B. —Use of "Dust & Scratches" filter and "History Brush." "Radius" bar setting is moved to left until white dust particles disappear (setting of 8 pixels). "Threshold" slider bar is then moved to left until dust begins to reappear on image; then bar is nudged back to left so dust disappears (setting of 7 levels). Click "OK." Resulting sonogram shows no dust particles but appears unacceptably soft.