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Fig. 2A. —Use of "High-Pass" filter in Photoshop (Adobe Systems, Mountain View, CA). Original unsharpened sonogram of newborn with postinfectious hydrocephalus is shown on right. Open "Layers" window (Window Show Layers), and duplicate background layer by dragging it to "Bent Page" icon at the bottom of "Layers" window (black arrow), as shown in left upper corner. Select "High-Pass" filter by clicking "Filter" menu bar (Filter Other High Pass) as shown in left lower corner. Click on background copy layer (white arrow).