肿瘤和腹部、肝脏和肠的放射性比值低。
However, the radioactivity ratios between tumor to liver, intestine and stomach were low.
结果AD组各神经心理学测验量表评分及SPECT放射性计数比值均低于正常对照组。
Results the values in SPECT radioactive count ratio and scores of neuropsychological tests were lower in the AD patients than that in normal subjects.
近年来，随着检测灵敏度和分辨率的提高，该技术在放射性核素含量和同位素比值测定中的应用日益突出。
In recent years, with the improvement of sensitivity and resolution, its application was increasing to determine radionuclides content and isotope ratios.
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