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颅内含水体积的变化情况能够直接反映脑水肿病情的严重程度。为此,设计了用于检测脑水肿的开放式核磁共振(ONMR)系统,通过检测目标区域不同深度物体的核磁共振(NMR)信号和被测物在不同含水体积情况下的核磁共振信号,来检测头颅中不同位置的含水体积。首先描述了系统中主磁体的设计模型、射频(RF)线圈的优化选择,其次制作了螺线型线圈印刷电路板(PCB)模型和电容匹配电路,搭建了开放式核磁共振系统,最后以位于磁体目标区域不同深度位置的橡皮和不同含水体积的面粉为样品,用实验验证了系统的可靠性和准确性。实验结果表明所设计的系统能够用来检测被测物体中不同位置的含水体积情况,进而可以用于脑水肿的实时检测。整个系统具有便携性、小型化、价格低廉的优点,可以为开放式核磁共振仪进一步应用于临床提供实验支撑。
Changes in intracranial aqueous volume can directly reflect the severity of cerebral edema. To this end, an open magnetic resonance (ONMR) system for detecting cerebral edema is designed. By detecting NMR signals of different depths in the target area and NMR signals of the tested object in different water volumes, Detection of the skull in different positions of the aqueous volume. Firstly, the design model of the main magnet in the system, the optimized selection of the RF coil, the spiral coil printed circuit board (PCB) model and the capacitor matching circuit are described. An open nuclear magnetic resonance system is set up. Finally, The eraser at different depths and the flour with different water contents in the target area of the magnet are used as samples, and the reliability and accuracy of the system are verified by experiments. The experimental results show that the designed system can be used to detect the water content of different locations in the measured object, which can be used for real-time detection of cerebral edema. The whole system has the advantages of portability, miniaturization and low price, and can provide experimental support for further application of open NMR in clinical.