Selective Isotope CT Imaging Based on Nuclear Resonance Fluorescence Transmission Method

Selective Isotope CT Imaging Based on Nuclear Resonance Fluorescence Transmission Method
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基于核磁共振荧光透射法的选择性同位素CT成像

DOI:
10.1109/tns.2020.3004565
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发表时间:
2020
影响因子:
1.8
通讯作者:
Katoh Masahiro
Katoh Masahiro
中科院分区:
工程技术3区
文献类型:
--
作者:
Ali Khaled;Ohgaki Hideaki;Zen Heishun;Kii Toshiteru;Hayakawa Takehito;Shizuma Toshiyuki;Toyokawa Hiroyuki;Taira Yoshitaka;Iancu Violeta;Turturica Gabriel;Ur Calin Alexandru;Fujimoto Masaki;Katoh Masahiro

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在紫外同步轨道辐射III实验中,利用MeV区域的准单色激光康普顿散射(LCS)γ射线束,基于核共振荧光(NRF)透射方法的计算机断层扫描(CT)成像的同位素选择性得到了证明。(UVSOR-III)(国立自然科学研究院分子科学研究所),将两个浓缩铅同位素棒(206 Pb和208 Pb)植入铝筒中。由于这两个棒在原子过程中显示出相同的伽马射线衰减,因此不可能使用基于伽马射线的原子衰减的标准伽马-CT技术来区分它们。LCS γ射线束的最大能量为5.528 MeV,在共振能量下的强度约为5.5光子/s/eV(Jπ= 1-,在208 Pb中为5.512 MeV)。使用孔径为1 mm的铅准直器来确定CT靶点处LCS伽马射线束的尺寸。208 Pb棒的CT图像选择性地获得,像素大小分辨率为2 mm,这取决于CT载物台的水平步长。
The isotope selectivity of computed tomography (CT) imaging based on nuclear resonance fluorescence (NRF) transmission method using a quasi-monochromatic laser Compton scattering (LCS) gamma-ray beam in the MeV region was demonstrated at the Ultra Violet Synchrotron Orbital Radiation-III (UVSOR-III) Synchrotron Radiation Facility (Institute of Molecular Science, National Institute of Natural Science) for two enriched lead isotope rods (206Pb and208Pb) implanted in an aluminum cylinder. Since these two rods show the same gamma-ray attenuation in atomic processes, it is impossible to differentiate between them using a standard Gamma-CT technique based on atomic attenuation of gamma rays. The LCS gamma-ray beam had a maximum energy of 5.528 MeV and an intensity of approximately 5.5 photons/s/eV at the resonance energy (Jπ= 1-at 5.512 MeV in208Pb). A lead collimator with a hole diameter of 1 mm was used to define the size of the LCS gamma-ray beam at the CT target. The CT image of the208Pb rod was selectively obtained with a 2-mm pixel size resolution, which was determined by the horizontal step size of the CT stage.
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