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五十年代初第一台同位素扫描机问世以来,同位素扫描技术在医学中的应用有了很大发展。尤其在脏器体外成像方面,它已经成为软组织肿瘤定位诊断的一种重要手段。但是,人们对于其成像质量并不满意,因为即使是相当先进的扫描机,对于肝脏等大脏器深部肿瘤的实际分辨率在直径三公分以上。因此,如何提高扫描分辨率一直是核医学工作者和核医学仪器设计人员探讨的课题。早先,人们均从改善准直器特性方面去努力,于是准直孔越做越多。准直器的改善确实提高了闪烁探头的空间分辨率。但是,一
Since the advent of the first isotope scanner in the early 1950s, there has been a great development in the use of isotope scanning technology in medicine. Especially in organ in vitro imaging, it has become an important means of diagnosis of soft tissue tumor localization. However, people are not satisfied with the imaging quality because even a fairly advanced scanner has an actual resolution of more than three centimeters in diameter for deep tumors of large organs such as the liver. Therefore, how to improve the scanning resolution has always been a topic discussed by nuclear medicine researchers and nuclear medicine instrument designers. Earlier, people all worked hard to improve the collimator characteristics, so the more and more collimation holes. Improvements in collimators indeed improve the spatial resolution of the scintillation probe. However, one