磁共振成像仪的线圈调谐检测模块设计

线圈作为磁共振成像系统的重要组成部分,其性能直接影响成像质量.为了尽可能保证信噪比和图像质量,探测前需进行线圈调谐.调谐时,通过微调线圈的共振频率和阻抗两个参数,使线圈共振频率与拉莫尔频率一致,线圈和前放电路阻抗匹配.本文设计了一种线圈调谐的检测模块,阐述了模块的工作原理和软硬件设计.模块包括测量、处理两个部分,其中采用STM32采集电压数据,通过数据转换后用液晶屏显示实时波形.实际结果表明,此检测模块不仅延续了上位机调谐显示直观清晰的优点,而且兼具独立数码显示表的操作便捷的优点.

Coil tuning detection module design of magnetic resonance imaging

Coil as an important part of magnetic resonance imaging system,its performance directly effects the imaging quality.In order to ensure the signal-to-noise and image quality as much as possible,it must tune before detect.When tuning,it make the coil resonance frequency is consistent whit the larmor frequency,coil and the circuit impedance matching by tuning the coli frequency and impedance.In this paper,we design a coil tuning detection module,elaborated the principle of module and design of software and hardware.This module includes two parts:measurement and processing. Use STM32 to collect the data of voltage,and display real-time waveform by LCD screen.It turned out that this module not only has the advantage of intuitive and clear by upper machine tuning,and both has the advantage of convenient operation.