A very common type of data produced by testing, one which is often a source for quality metrics, is defects.
测试产生的一个非常普通的数据类型是缺陷，它通常是质量度量方法的来源。
The goal of this study is to design a common testing system for SPECT quality control according to NEMA standard.
本研究的目的旨在按nema标准设计一套通用的SPECT质量控制测试系统，供各种型号SPECT的验收，性能比较和常规质控使用。
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