9.4T大鼠脊椎磁共振成像射频线圈

An radio frequency coil design for rat spinal magnetic resonance imaging at 9.4 T

在大鼠脊椎磁共振扫描实验中,主磁场强度较低且传统射频线圈成像深度浅、空间兼容性差、硬件成本要求高,最终导致大鼠脊椎部位图像信噪比降低。本文开发一种用于9.4 T高场下大鼠脊椎磁共振成像的射频线圈,旨在提高大鼠脊椎部位扫描图像信噪比的同时又能避免所设计线圈对特殊状态下(比如心脏导管插入等)的大鼠脊椎扫描造成的空间限制。本文通过仿真建模、线圈原型建立以及带负载Q值测试和9.4 T下水膜和活体大鼠脊椎线圈扫描成像对比实验,验证了所设计射频线圈在大鼠脊椎测试应用的优势。

For rat spinal magnetic resonance imaging(MRI) experiments,due to the lower main magnetic field strength,shallower detected depth and poor spatial compatibility of the traditional radio frequency(RF) coil,the image signal-to-noise ratio(SNR) of rat spinal was rather lower.In this paper,a RF coil for rat spinal MRI at 9.4 T was developed to improve the image quality and at the same time to avoid the space limitation while scanning in special conditions(cardiac catheterization,etc.).In this article,open birdcage structure was built and magnetic field distribution was calculated.The phantom and rat spine MRI imaging were experimented at 9.4 T to verify the advantage of the coil in rat spine MRI application.