31 March 2011 X-ray imaging using K-edge filters
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Abstract
It is known that high dose X-ray irradiation increases the probability of cancer development in humans. Therefore, the dose decrease at every X-ray imaging event is a major goal, especially during CT tests, where the applied dose is generally a multiple of a few single radiographic imaging doses. Using narrow energy X-ray beams instead of wide energy X-rays has several advantages. First, it reduces the beam hardening effect, when the output beam (after the patient) is harder, i.e. it consists of a higher ratio of high energy X-ray photons than the input beam. Imaging with narrow energy X-rays also provides lower scatter noise than using wide energy X-rays. As a result we can obtain high signal to noise (S/N) ratio X-ray images while using much lower dose than with a regular x-ray beam. The paper points out how we can generate narrow energy X-ray beams by using special materials for which the K edge absorption peak falls into the diagnostic X-ray energy range. Furthermore, it will be shown that contrast agent materials such as Iodine are more effective when combined with the right K edge filter material.
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George Zentai, George Zentai, } "X-ray imaging using K-edge filters", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798418 (31 March 2011); doi: 10.1117/12.879188; https://doi.org/10.1117/12.879188
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