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초록· 키워드
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Dual energy computed tomography (DECT) is used to classify two materials and quantify the mass density of each material in the human body. An energy modulation filter based DECT could acquire two images, which are generated by the low- and high-energy photon spectra, in one scan, with one tube and detector. In the case of DECT using the energy modulation filter, the filter should perform the optimization process for the type of materials and thicknesses for generating two photon spectra. In this study, Geant4 Monte-Carlo simulation toolkit was used to execute the optimization process for determining the property of the energy modulation filter. In the process, various materials used for the energy modulation filter are copper (Cu, 8.96 g/cm3), niobium (Nb, 8.57 g/cm3), stannum (Sn, 7.31 g/cm3), gold (Au, 19.32 g/cm3), and lead (Pb, 11.34 g/cm3). The thickness of the modulation filter varied from 0.1 mm to 1.0 mm. To evaluate the overlap region of the low- and high-energy spectrum, Geant4 Monte-Carlo simulation is used. The variation of the photon flux and the mean energy of photon spectrum that passes through the energy modulation filter are evaluated. In the primary photon spectrum of 80 kVp, the optimal modulation filter is a 0.1 mm lead filter that can acquire the same mean energy of 140 kVp photon spectrum. The lead filter of 0.1 mm based dual energy CBCT is required to increase the tube current 4.37 times than the original tube current owing to the 77.1% attenuation in the filter.
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참고문헌 (13)
참고문헌 신청
Primak AN / 2009 / Improved dual energy material discrimination for dual source CT by means of additional spectral filtration / Med Phys 36(4):1359~1369
Guillaume L / 2011 / Extracting atomic numbers and electron densities from a dual source dual energy CT scanner: experiments and a simulation model / Radiotherapy and Oncology 100(3):375~379
Johnson TRC / 2012 / Dual energy CT: general principles / American Roentgen Ray Society 199:S3~S8
Petersilka M / 2008 / Technical principles of dual source CT / Eur J Radiol 68(3):362~368
Altman A / 2009 / A double-layer detector, dual-energy CT —principles, advantages and applications / Med Phys 36(6):2750~2750
Guillaume L / 2011 / Extracting atomic numbers and electron densities from a dual source dual energy CT scanner: experiments and a simulation model / Radiotherapy and Oncology 100(3):375~379
Johnson TRC / 2012 / Dual energy CT: general principles / American Roentgen Ray Society 199:S3~S8
Petersilka M / 2008 / Technical principles of dual source CT / Eur J Radiol 68(3):362~368
Altman A / 2009 / A double-layer detector, dual-energy CT —principles, advantages and applications / Med Phys 36(6):2750~2750
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