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美国国家标准与技术研究院(NIST)的科学家开发出一种新的标准参考物质(SRM),这是首个此类测量工具,能使医院把计算机断层扫描(CAT)得出的重要的组织密度测量结果与国际标准联系起来。CAT扫描是指通过计算机处理,融合多重X射线生成类似人体组织的三维扫描图像。这些横截面扫描结果十分有用,能够识别出普通二维X射线图像难以觉察的变动,如能显示肺组织中出现癌变或气肿的一些变化。仅在美国每年就有数以百万次计的CAT扫描,但NIST物理学家Zachary Levine称,随着时间推移,扫描设备的输出结果总存在一种“略微偏离”的趋势。
Scientists at the National Institute of Standards and Technology (NIST) have developed a new standard reference material (SRM), the first such measurement tool that enables hospitals to translate computed tomography (CAT) derived vital tissue Density measurements are linked with international standards. CAT scan refers to the computer processing, fusion of multiple X-ray generated similar to human tissue three-dimensional scan images. These cross-sectional scans are useful for identifying unreadable changes to plain two-dimensional X-ray images, such as showing some changes in cancerous or emphysematous lung tissue. There are millions of CAT scans in the United States alone each year in the United States, but NIST physicist Zachary Levine said there is always a “slight deviation” from the output of the scanning device over time.