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[目的]对AAPM报告的MRI设备应用质量性能标准的评价。[方法]对2002年检测的40台MRI设备的应rrrrrrrrn用质量性能参数进行统计分析。[结果]按场强大小分组的各项性能参数值和分别按均匀度、线性度误差(畸变)、层厚误rrrrrrrrn差、空间分辨力、低对比度分辨力分组的设备台数和百分数。[结论]AAPM报告尚未提出信噪比的标准,该标准应该按rrrrrrrrn场强分组制订,场强分为<0.5T、0.5T、1.0T、1.5-2.0T四组。该报告均匀度80％的标准偏低;空间分辨力1mm的标准偏rrrrrrrrn高;线性度误差(畸变)小于5％和层厚误差±1mm的标准较合适;该报告缺少低对比度分辨力的检测项目和有关标准,低rrrrrrrrn对比度分辨力标准应根据不同场强制订,场强分为<0.5T和≥0.5T两组。
[Objective] To evaluate the quality performance standards of MRI equipment reported by AAPM. [Methods] The statistical data of 40 MRI equipment detected in 2002 were analyzed with mass performance parameters. [Results] According to the field strength of the size of the various groups of performance parameters and values ?? respectively, according to uniformity, linearity error (distortion), layer thickness error r r r r r r r r Spatial Resolution, Low Contrast Resolution Sets the number of units and percentages. [Conclusion] The standard of signal to noise ratio has not been put forward in AAPM report. The standard should be formulated according to field strength group. The field strength is divided into <0.5T, 0.5T , 1.0T, 1.5-2.0T four groups. The standard 80% uniformity of the report is low; the standard deviation of spatial resolution is 1mm; the linearity error (distortion) is less than 5% and the layer thickness The standard of error ± 1mm is more suitable; the report lacks the test item of low contrast resolution and the relevant standard. The standard of contrast resolution should be based on different field strength Development, field strength is divided into <0.5T and ≥ 0.5T two groups.