西门子加速器OPTIFOCUS多叶准直器故障检修三例
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation（2016）
Abstract
该文简单介绍了OPTIFOCUS多叶准直器的工作原理,针对常见的三种故障作出了具体的分析及维修.
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Key words
linear accelerator,multileaf collimator,Potentiometer,encoder,Analog-to-digital conversion
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