Visibility and sharpness of lung structure at 90, 140, and 350 kV.

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Abstract
Human lung specimens containing a variety of lesions were radiographed at 90, 140 and 350 kV. Nodules less than 3 mm in diameter and linear shadows less than 0.3 mm in diameter were not visible or poorly seen at 350 kV. Larger lesions were seen well with all 3 kilovoltages, although the interfaces were more distinct on the 90 and 140 kV views. The best images were obtained at 90, slightly worse at 140 and least satisfactory at 350 kV; most features of the normal and diseased lung were readily seen at all 3 kilovoltages. The apparent degradation of the lung image at high kV levels may be explained by the large focal spot of the 350 kV system and the attenuation properties of high-energy photons.

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