ビームハードニング特性を考慮したエネルギー差分法の検討
URI | http://harp.lib.hiroshima-u.ac.jp/hirokoku-u/metadata/6824 | ||||||||||||||||||||||||||||||
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File |
iryoukougaku4-2.pdf
( 1526.0 KB )
Open Date
:2010-07-25
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Title |
ビームハードニング特性を考慮したエネルギー差分法の検討
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Author |
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Subject |
energy subtraction method
beam hardening
metal filter
K-absorption edge
x-ray spectru
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Abstract |
The energy subtraction (ES) method is an image processing technique that depicts a radiograph from which the image of intentionally specified tissue has been eliminated. The ES radiograph is usually obtained by subtraction of two x-ray images taken for two different values of tube voltage, owing to inherent energy dependence of the attenuation coefficient of each tissue. Since white x rays are, generally used in the ES method, the beam hardening occurs during x-ray penetration through a subject, resulting in discrepancies among x-ray absorption ratios even for the same tissue depending on its location in the subject. This brings erroneous information about the attenuation coefficient also in the ES method. Therefore, a new ES method was examined using dual energy x rays with the same beam hardening characteristics. As a result, this ES method suggested the high power to discriminate materials and its usefulness in radiological diagnoses as compared with the usual ES method using white x rays. |
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Journal Title |
医療工学雑誌
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Issue |
4
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Spage |
9
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Epage |
16
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Published Date |
2010/03/15
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Publisher |
広島国際大学大学院総合人間科学研究科医療工学専攻
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ISSN |
1881-9265
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NCID |
AA12217173
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Language |
jpn
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NIIType |
Departmental Bulletin Paper
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Text Version |
出版社版
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Sort Key |
2
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Set |
hirokoku-u
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