Phelps M E, Hoffman E J, Ter-Pogossian M M
Radiology. 1975 Dec;117(3 Pt 1):573-83. doi: 10.1148/117.3.573.
Radioactive sources of 241Am, 125I, 153Gd, 170Tm, and 57Co were used to measure the attenuation coefficient muL of various body tissues (gray and white matter, fat, liver, pancreas, and muscle), fluids (water, cerebrospinal fluid, plasma, and red blood cells), and cerebral lesions (blood clots, edematous brain tissue, and eight types of brain tumors) at 16 different energies in the range 18-136 keV. Experimental accuracy was about 0.1-0.3% and 0.2-0.4% in the energy ranges 18-60 keV and 60-136 keV, respectively. Comparisons with values determined in vivo and in vitro with an EMI scanner showed excellent agreement. It is hoped that these findings will provide a better understanding of the photon interactions at the sensitivity level of computed tomography.
使用241Am、125I、153Gd、170Tm和57Co等放射源，在18 - 136 keV范围内的16种不同能量下，测量各种身体组织（灰质和白质、脂肪、肝脏、胰腺和肌肉）、液体（水、脑脊液、血浆和红细胞）以及脑部病变（血凝块、脑水肿组织和八种脑肿瘤）的衰减系数μL。在18 - 60 keV和60 - 136 keV能量范围内，实验精度分别约为0.1 - 0.3%和0.2 - 0.4%。与使用EMI扫描仪在体内和体外测定的值进行比较，结果显示出极佳的一致性。希望这些发现能在计算机断层扫描的灵敏度水平上，让人更好地理解光子相互作用。
