MRI设备中心频率和发射增益稳定性检测及处置界限建立

发布时间：2018-04-04 10:40

  本文选题：中心频率　切入点：发射增益　出处：《中国医学影像技术》2017年08期

【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 3.0T750W),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≤119.04Hz、≤68.30Hz和≤36.57Hz。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。
[Abstract]:Aim to detect the stability of central frequency and transmit gain of three MRI devices and to establish their disposal limits.Methods three MRI devices (1:GE 3.0T HDD, 2:GE 1.5T HDiand 3:GE 3.0T 750WN) were used to scan the ACRs motifs.The center frequency and the transmission gain are recorded in the pre-scanning phase. When the equipment is in good operation condition, the center frequency and the emission gain are continuously detected 8 times, the mean value and standard deviation are calculated, and the disposal limits of the two indexes are established.Results the mean central frequency of the equipment was 127,725 772.38 卤39.68 34.15)Hz (63 875 740.13 卤34.15)Hz) and 127,771 958.38 卤12.19 Hz (127,771 958.38 卤12.19 Hz) respectively, and the disposal limits were below 119.04 Hz, 鈮，

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