| 对MRI设备层间射频信号干扰进行检测的实践 |
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| 引用本文： | 尹红霞,刘雅文,杨娉娉,张艺,朱建明,杨正汉,王振常. 对MRI设备层间射频信号干扰进行检测的实践[J]. 中国医学影像技术, 2017, 33(11): 1607-1610 |
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| 作者姓名： | 尹红霞 刘雅文 杨娉娉 张艺 朱建明 杨正汉 王振常 |
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| 作者单位： | 首都医科大学附属北京友谊医院放射科, 北京 100050,中国计量大学信息工程学院, 浙江 杭州 310018,中国计量大学信息工程学院, 浙江 杭州 310018,首都医科大学附属北京友谊医院放射科, 北京 100050,中国计量大学信息工程学院, 浙江 杭州 310018,首都医科大学附属北京友谊医院放射科, 北京 100050,首都医科大学附属北京友谊医院放射科, 北京 100050 |
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| 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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| 摘 要： | 目的 对3台MRI设备的层间射频信号干扰情况进行检测,以加深对层间射频信号干扰现象的认识。方法 通过3台MRI设备（设备1：GE 1.5T HDi,装机时间：2012年;设备2：GE 3.0T HD,装机时间：2006年;设备3：GE 3.0T 750W,装机时间：2016年）采用轴位T1WI序列扫描ACR模体,记录层间距为5.0、1.0、0.5和0 mm时的SNR,绘制SNR变化百分比与层间距百分比的函数图。处置标准：当层间距从5 mm减小到0时,由层间射频信号干扰作用所导致的SNR的下降不超过20%。结果 当层间距由5 mm减小到0时,设备1的SNR下降幅度为18.16%,设备2的SNR下降幅度为23.57%,设备3的SNR下降幅度为10.75%;设备1和设备3的层间射频信号干扰检测结果达到处置标准,设备2（使用时间超过10年）的检测结果未达标。结论 3台MRI设备都存在不同程度的层间射频信号干扰现象,其中使用时间最久的设备检测结果不达标。层间射频信号干扰检测应该在临床质量控制工作中受到重视。
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| 关 键 词： | 层间射频信号干扰 质量控制 磁共振成像 |
| 收稿时间： | 2017-06-08 |
| 修稿时间： | 2017-10-12 |
Initial practice on cross-talk tests for MRI scanners |
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| YIN Hongxi,LIU Yawen,YANG Pingping,ZHANG Yi,ZHU Jianming,YANG Zhenghan and WANG Zhenchang. Initial practice on cross-talk tests for MRI scanners[J]. Chinese Journal of Medical Imaging Technology, 2017, 33(11): 1607-1610 |
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| Authors: | YIN Hongxi LIU Yawen YANG Pingping ZHANG Yi ZHU Jianming YANG Zhenghan WANG Zhenchang |
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| Affiliation: | Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China,College of Information Engineering, China Jiliang University, Hangzhou 310018, China,College of Information Engineering, China Jiliang University, Hangzhou 310018, China,Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China,College of Information Engineering, China Jiliang University, Hangzhou 310018, China,Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China and Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China |
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| Abstract: | Objective To detect the cross-talk RF signal interference of three MRI scanners, in order to deepen the understanding of cross-talk RF signal interference. Methods Three different GE magnetic resonance imaging scanners (GE 1.5T HDi, installation time:2012; GE 3.0T HD, installation time:2006; GE 3.0T 750W, installation time:2016) were tested. The axial T1-weighted sequence was used to scan ACR phantom. Slice gaps with 5.0 mm, 1.0 mm, 0.5 mm and 0 were performed, respectively. SNR values were also recorded. Based on the results, the percentage change charts of SNR with slice gaps were made. Test standard was set as SNR decreased less than 20% when the slice gap reduced from 5 mm to 0. Results When slice gap was reduced from 5 mm to 0, SNRs for three scanners decreased by 18.16%, 23.57% and 10.75%, respectively. Both the results of cross-talk obtained with GE 1.5T HDi and GE 3.0T 750W scanner met the test standard, while the result obtained with GE 3.0T HD (used for more than 10 years) was below the standard. Conclusion The cross-talk RF signal interference still exists for three MRI scanners. The test result of the scanner used for the longest time is unqualified. The quality control test of cross-talk should be done in the daily work. |
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| Keywords: | Cross-talk Quality control Magnetic resonance imaging |
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