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Phantom: (a) coronal slice of the lung parenchyma maximum vertical extent, (b) coronal slice where the heart has the largest area. In vivo: (c) coronal slice of the lung parenchyma maximum vertical extent, (d) coronal slice where the heart has the largest area. All images shown at the same scale. The display window and level for (a) and (b) are equal as are the window and level for (c) and (d).
