Single-exposure dual-energy computed radiography: improved detection and processing
| Autor: | F. Kelcz, W. K. Sze, D.E. Brown, David P. Naidich, Charles A. Mistretta, R.T. Bystrianyk, D. L. Ergun |
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| Rok vydání: | 1990 |
| Předmět: |
Single exposure
business.industry Radiography Gadolinium chemistry.chemical_element Phosphor Noise (electronics) Radiography Dual-Energy Scanned Projection Optics chemistry Humans Medicine Radiology Nuclear Medicine and imaging Tomography Computed radiography Tomography X-Ray Computed business Nuclear medicine Technology Radiologic Algorithms Energy (signal processing) |
| Zdroj: | Radiology. 174:243-249 |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/radiology.174.1.2294555 |
| Popis: | Recent reports have emphasized the potential for dual-energy computed radiographic applications. An improved method for single-exposure material-selective imaging with a photostimulable phosphor computed radiography system was investigated. The essential elements of the technique are (a) prefiltration with gadolinium, which divides the incident broad-beam x-ray spectrum into low-energy and high-energy peaks; (b) a cassette consisting of four photostimulable phosphor plates that record images of increasing mean energies, with a computed energy separation of 23 keV from the front to the rear plate; (c) spatially dependent scatter and beam-hardening corrections; and (d) a noise-reduction algorithm based on noise correlations between bone-selective and soft-tissue-selective dual-energy images. These elements result in improved material cancellation and signal-to-noise ratio throughout the image. |
| Databáze: | OpenAIRE |
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