基于双参考源的数字磁共振控制台相位相干技术
收稿日期: 2022-03-04
网络出版日期: 2022-04-04
基金资助
上海市科技创新行动计划资助项目(19142202900);国家自然科学基金资助项目(21874045)
Phase Coherence Technology of Digital MR Console Based on Dual Reference Sources
Received date: 2022-03-04
Online published: 2022-04-04
本文提出了一种在数字磁共振控制台中保证发射机与接收机之间相位相干的方法.该方法通过可编程数字逻辑在发射机与接收机中各设计了一个同频的数字参考源，脉冲序列执行过程中，当发射机或接收机由于进行了频率切换而失去相位相干性时，通过重新设置它们的相位以确保它们与各自的参考源同步，从而恢复两者之间的相位相干性.经过水膜成像实验验证，该方法具有良好的成像效果，且既不需要额外的硬件电路，也不增加序列设计的复杂度，具有很高的实用性.
关键词： 磁共振; 谱仪; 相位相干; 现场可编程门阵列（FPGA）; 参考源
廖文姗 , 徐俊成 , 姚守权 , 李建奇 , 蒋瑜 . 基于双参考源的数字磁共振控制台相位相干技术[J]. 波谱学杂志, 2022 , 39(3) : 327 -336 . DOI: 10.11938/cjmr20222980
In this article, an effective method to keep the phase coherence between the transmitter and the receiver in digital magnetic resonance (MR) console is proposed. Relying on programmable digital logic, we design two digital reference sources with the same frequency and embed them in the transmitter and the receiver respectively. During pulse sequence execution, when the transmitter or receiver loses phase coherence due to frequency switching, the phase coherence is restored by resetting the phase of the transmitter and receiver to ensure they are synchronized with their corresponding reference source. The experimental results have verified that this method can accurately keep the phase coherence between the transmitter and receiver, and neither additional hardware circuit nor complex sequence design is required, which adds to great practicability.
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