脑功能成像时磁共振仪器稳定性的一种简单评价方法

A simple method for evaluation of the stability of magnetic resonance scanner during brain function imaging

目的 发展一种评价脑功能成像时磁共振机器稳定性的简单方法。方法 用与脑功能成像相同的快速平面回波成像(EPI)序列和参数对均匀水模作一次扫描,由一个时间序列上的图像表现来评价仪器的稳定性。结果 得到了128张水模的EPI图像以及水模的均匀部分在每张图相同部位感兴趣区(ROI)处的信号水平的均值、标准差、极差的质量控制图。结论ROI的质量控制图能用于磁共振机器稳定性的评价。

Objective To develop a simple method for evaluating the stability of magnetic resonance (MR) scanner during brain function imaging. Method A symmetrical water phantom was scanned using the same sequence and parameters as for brain function imaging. The stability of MR scanner was evaluated in view of the signal levels of phantom images. Result The quality control chart of the mean value, standard deviation and the range of the signal level in the region of interest (ROI) within the same region on 128 phantom images were obtained, demonstrating the state of stability of the MR scanner. Conclusion The quality control chart of ROI can be used to evaluate the stability of the MR scanner.