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Proceedings Paper

The Energy Factor In Radiographic Imaging
Author(s): A. Macovski; W. R. Brody; R. E. Alvarez; L. A. Lehmann
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Paper Abstract

The photon energy spectrum has played a relatively minor role in classical radiographic imaging. Radiologists have used different regions of the spectrum for different studies. For example; lower energies are used for mammography to emphasize calcifications, and higher energies are used for chest studies to minimize rib shadows. These effects, however, are relatively subtle compared to those of selective energy imaging to be described in this paper. We will describe the application of energy selectivity to computerized tomography and projection radiography. In the case of computerized tomography the technique eliminates the non-linear spectral-shift artifact, and provides the average atomic number and density of each pixel. In the case of projection radiography, any intervening material can be removed to facilitate visualization of some desired structure. In addition, as with CT, an unknown lesion can be identified based on its average atomic number.

Paper Details

Date Published: 1 November 1982
PDF: 5 pages
Proc. SPIE 0372, Physics and Engineering in Medical Imaging, (1 November 1982); doi: 10.1117/12.934495
Show Author Affiliations
A. Macovski, Stanford University (United States)
W. R. Brody, Stanford University (United States)
R. E. Alvarez, Stanford University (United States)
L. A. Lehmann, Stanford University (United States)


Published in SPIE Proceedings Vol. 0372:
Physics and Engineering in Medical Imaging
Orhan Nalcioglu, Editor(s)

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