| 尹红霞,杨娉娉,刘雅文,钟朝辉,朱建明,杨正汉,王振常.MRI设备中心频率和发射增益稳定性检测及处置界限建立[J].中国医学影像技术,2017,33(8):1260~1263 |
| MRI设备中心频率和发射增益稳定性检测及处置界限建立 |
| Stability tests and action limits setting for central frequency and transmitter gain of MRI scanners |
| 投稿时间：2017-06-08 修订日期：2017-07-10 |
| DOI：10.13929/j.1003-3289.201706054 |
| 中文关键词: 中心频率 发射增益 质量控制 处置界限 |
| 英文关键词:Central frequency Transmitter gain Quality control Action limits |
| 基金项目:国家重点研发计划数字诊疗装备研发重点专项（2016YFC0106901）、科技北京百名领军人才培养工程（Z141107001514002）、北京市医管局"使命"人才计划（SML20150101）、北京学者（京人社专家发[2015]160号） |
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| 中文摘要: |
| 目的 对3台MRI设备进行中心频率和发射增益的稳定性检测，并建立其处置界限。方法 对本单位3台MRI设备（设备1：GE 3.0T HD；设备2：GE 1.5T HDi；设备3：GE 3.0T 750W），采用轴位T1WI扫描美国放射学会（ACR）模体。在预扫描阶段记录中心频率和发射增益，在设备运行状态良好的情况下，连续检测中心频率和发射增益8次，计算均值和标准差，建立2个指标的处置界限。结果 设备1、2、3的中心频率均值分别为（127 725 772.38±39.68） Hz、（63 875 740.13±34.15） Hz和（127 771 958.38±12.19） Hz，其处置界限分别为周变化值≤ 119.04 Hz、≤ 68.30 Hz和≤ 36.57 Hz。发射增益均值分别为（125.25±1.28） dB、（101.75±1.98） dB和（113.25±0.89） dB，其处置界限分别为（125.25±2.56） dB、（101.75±3.96） dB和（113.25±1.78） dB。结论 3台MRI设备的中心频率和发射增益检测结果均符合处置界限的要求；处置界限的建立为临床质量控制提供了正常参考值范围。 |
| 英文摘要: |
| Objective To test the central frequency (CF) and transmitter gain (TG) of MRI scanners,and set up their action limits.Methods Three different MRI devices (GE 3.0T HD,GE 1.5T HDi and GE 3.0T 750W) were tested by scanning American College of Radiology (ACR) phantom with the axial T1WI series.In the pre-scanning of T1WI series for the ACR phantom,the CF and TG were recorded.It was tested for eight times when MRI scanners were in good condition.The action limits of CF and TG were calculated based on mean values and standard deviations.Results The mean values of CF for three devices were (127 725 772.38±39.68) Hz,(63 875 740.13±34.15) Hz,and (127 771 958.38±12.19) Hz,respectively.Their action limits were ≤ 119.04 Hz,≤ 68.30 Hz,and ≤ 36.57 Hz,respectively.The mean values of TG for three devices were (125.25±1.28) dB,(101.75±1.98) dB,and (113.25±0.89) dB,respectively.Their action limits were (125.25±2.56) dB,(101.75±3.96) dB,and (113.25±1.78) dB,respectively.Conclusion The CF and TG for three MRI scanners are all consistent with the action limits in this study.The CF and TG action limits will provide criterions for the clinical quality control. |
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