지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.1
- 수록면
- 61 - 70 (10page)
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초록· 키워드
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In this study, a simple post-reconstruction dual-energy computed tomography (CT) method is proposed. A dual-energy CT algorithm for monochromatic x-rays was adopted and applied to the dual-energy CT of polychromatic x-rays by assigning a representative mono-energy. The accuracy of algorithm implementation was tested with mathematical phantoms. To test the sensitivity of this algorithm to the inaccuracy of representative energy value in energy values, a simulation study was performed with mathematical phantom. To represent a polychromatic x-ray energy spectrum with a single-energy, mean energy and equivalent energy were used, and the results were compared. The feasibility of the proposed method was experimentally tested with two different micro-CTs and a test phantom made of polymethyl methacrylate (PMMA), water, and graphite. The dual-energy calculations were carried out with CT images of all possible energy pairs among 40, 50, 60, 70, and 80 kVp. The effective atomic number and the electron density values obtained from the proposed method were compared with theoretical values. The results showed that, except the errors in the effective atomic number of graphite, most of the errors were less than 10 % for both CT scanners, and for the combination of 60 kVp and 70 kVp, errors less than 6.0 % could be achieved with a Polaris 90 CT. The proposed method shows simplicity of calibration, demonstrating its practicality and feasibility for use with a general polychromatic CT.
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참고문헌 (25)
참고문헌 신청
A. J. Coleman / 1985 / A beam-hardening correction using dual-energy computed tomography / Phys Med Biol 30 (11) : 1251 ~ 1256
B. De Man / 2001 / An iterative maximum-likelihood polychromatic algorithm for CT / IEEE Trans Med Imaging 20 (10) : 999 ~ 1008
B. J. Heismann / 2003 / Density and atomic number measurements with spectral x-ray attenuation method / Journal of Applied Physics 94 (3) : 2073 ~ 2079
C. Rizescu / 2001 / Determination of local density and effective atomic number by the dualenergy computerized tomography method with the 192Ir radioisotope / Nuclear Instrum
E. Y. Sidky / 2004 / Impact of polychromatic x-ray sources on helical, cone-beam computed tomography and dual-energy method / Phys Med Biol 49 (11) : 2293 ~ 2303
B. De Man / 2001 / An iterative maximum-likelihood polychromatic algorithm for CT / IEEE Trans Med Imaging 20 (10) : 999 ~ 1008
B. J. Heismann / 2003 / Density and atomic number measurements with spectral x-ray attenuation method / Journal of Applied Physics 94 (3) : 2073 ~ 2079
C. Rizescu / 2001 / Determination of local density and effective atomic number by the dualenergy computerized tomography method with the 192Ir radioisotope / Nuclear Instrum
E. Y. Sidky / 2004 / Impact of polychromatic x-ray sources on helical, cone-beam computed tomography and dual-energy method / Phys Med Biol 49 (11) : 2293 ~ 2303
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