The Use of a Novel Quantitative Marker of Echogenicity of Pleural Fluid in Parapneumonic Pleural Effusions

Figure 1

Image cropping technique for analysis using the Image J software. Using the freehand selection, we determine the area of interest. By applying histogram analyses, tissue echo levels are automatically calibrated to the value of 255 for the white pixels and 0 for the black pixels. The mean number of pixels in the selected area is automatically calculated.

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