Stability tests and action limits setting for central frequency and transmitter gain of MRI scanners
10.13929/j.1003-3289.201706054
- VernacularTitle:MRI设备中心频率和发射增益稳定性检测及处置界限建立
- Author:
Hongxia YIN
;
Pingping YANG
;
Yawen LIU
;
Zhaohui ZHONG
;
Jianming ZHU
;
Zhenghan YANG
;
Zhenchang WANG
- Keywords:
Central frequency;
Transmitter gain;
Quality control;
Action limits
- From:
Chinese Journal of Medical Imaging Technology
2017;33(8):1260-1263
- CountryChina
- Language:Chinese
-
Abstract:
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.
