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:GE3.0T750W,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0mm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5mm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5mm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。
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(GE1.5 T HDi,installation time:2012;GE 3.0 T HD,installation time:2006;GE 3.0 T750 W,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% and10.75%,respectively.Both the results of cross-talk obtained with GE 1.5 T HDi and GE 3.0 T750 Wscanner met the test standard,while the result obtained with GE 3.0 T 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.
出处
《中国医学影像技术》
CSCD
北大核心
2017年第11期1607-1610,共4页
Chinese Journal of Medical Imaging Technology
基金
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)