Near-Real-Time Radiography Detects 0.1% Changes in Areal Density with 1-Millimeter Spatial Resolution
Digital subtraction radiography serves angiography  and other medical applications successfully to extract minute x-ray signals from noisy backgrounds. Verhoeven  demonstrated that detecting surprisingly small changes in x-ray absorption makes this technique useful for industrial applications as well. I detect very small areal density differences and also wires as small as 2 µm in diameter although the spatial resolution of my x-ray apparatus is 1 mm.
KeywordsAreal Density Tungsten Wire Foreground Image Step Wedge Subject Contrast
Unable to display preview. Download preview PDF.
- 1.M. Paul Capp, Sol Nudelman, Donald Fisher, Theron W. Ovitt, Gerald D. Pond, Meryl M. Frost, Hans Roehrig, Joachim Seeger, and Donald Oimette, “Photoelectronic Radiology Department,” in Digital Radiography, William R. Brody, Ed. (SPIE, Bellingham, Washington, 1981), Vol. 314, pp. 2–8.Google Scholar
- 2.Leon Verhoeven, “Comparison of Enhancement Capabilities of Film Subtraction and Digital Subtraction Methods,” in Digital Radiography, William R. Brody, Ed. (SPIE, Bellingham, Washington, 1981), Vol. 314, pp. 114–120.Google Scholar
- 3.Robin P. Gardner and Ralph L. Ely, Jr., Radioisotope Measurement Applications in Engineering (Reinhold Publishing Corporation, New York, 1967), p. 282.Google Scholar
- 4.J. V. Gilfrich, “Spectral Distribution of X-Ray Tubes,” in Handbook of Spectroscopy, J. W. Robinson, Ed., (CRC Press, Boca Raton, Florida, 1974), Vol. I, pp. 232–237.Google Scholar
- 7.W. J. McCreary, D. W. Carroll, “CVD Techniques Applied to Energy Problems,” in Proceedings of the Eighth International Conference on Chemical Vapor Deposition. CVD-III, Gouviex, France, September 15–18, 1981 (The Electrochemical Society, Pennington, New Jersey, 1981), Vol. 81–7, pp. 769–781.Google Scholar
- 8.L. A. Feldkamp, Ford Motor Co., Dearborn, MI 48121, private communication, June 1987.Google Scholar