Observation of edge-enhancement in digital images obtained with a clinical mammography unit

摘要

X-ray field phase differences caused by an object can induce enhancement of the object edges in a radiological image, thus facilitating its visualization. We present numerical simulations and experimental data for the enhancement of weakly attenuating test object edges, imaged in-line, under magnification conditions, with a digital mammography unit (Mo/Mo anode/filter, 0.1 mm focal spot size, 25 kV, source-to-detector distance equal to 0.66 m, 70 μm pixel size). Images show increased illumination at the edges of TOR IMAM) phantom filaments and air bubble packaging film structures. The enhancement is about 1-3% over the background, thus requiring low noise conditions for visualization.