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Fig. 1A. —Use of "Unsharp Mask" tool in Photoshop (Adobe Systems, Mountain View, CA). Original coronal sonogram of newborn with postinfectious hydrocephalus is shown on right. "Sharpen" is selected by clicking "Filter" menu bar (Filter Sharpen Unsharp Mask), as shown in upper left corner. "Unsharp Mask" dialogue window is shown in lower left. Note "Amount," "Radius," and "Threshold" sliders have been moved to left end of bars (arrows).