目的 本文旨在探讨心电门控技 术克服心脏搏动对肝脏DWI的影响效果。 方法 选择志愿者41例，均行无门控和心 电门控肝脏DWI检查，心电门控组为实 验组，无门控组为对照组，b值选取0和 500s/mm2 ，分别采用不同的延迟触发时间 触发扫描。第一次肝脏DWI扫描为10点和 19点，采集2次的ADC值，由2名测量者分 别测量，测完第一次数据后，间隔15天再 进行第二次测量，总结分析ADC值，得出 结论。结果 对照组肝左叶ADC值明显高于 肝右叶；实验组肝左叶ADC值明显低于肝 右叶；Bland-Altman分析显示，该方法可 重复率高；延迟触发时间为500ms时，可 重复率高。结论 心电门控技术能有效降 低ADC值，提高肝脏DWI扫描图像质量，可 重复性高，最佳触发时间为500ms。采用 心电门控技术克服心脏搏动效果比较理 想，适宜推广使用。

Objective The purpose of this paper is to explore effect of the ECG-gating technology of liver DWI effects can overcome heart throb. Methods Select volunteers,41 cases were unable to control and switch control liver DWI examination,can the heart switch control group as the experimental group,unable to control group to the control group, s/b value selection of 0 and 500 mm squared,adopt different triggering time delay trigger scanning respectively. First liver DWI scans for 10 points and 19 points,can collect two ADC values,measured by two measurement,measurement is 1 after measuring the data for the first time, interval of 15 days and then to the second measurement, summarizes the analysis of ADC values, draw the conclusion. Results The control group of the left hepatic lobe ADC values were significantly higher than those of the right liver lobe. The experimental group of the left hepatic lobe ADC values significantly below the right liver lobe. Bland-Altman analysis shows that this method can repeat rate is high. When trigger delay time of 500 ms, can repeat rate is high. Conclusion Heart switch keying technology can effectively reduce the ADC values,improve the quality of liver DWI scans can, high repeatability, best to trigger in the 500 ms.The heart switch control technology to overcome heart beat effect is more ideal, suitable for promotion use.