Shakerian M, Balcom B J
UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Department of Mechanical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
J Magn Reson. 2018 Jan;286:36-41. doi: 10.1016/j.jmr.2017.11.006. Epub 2017 Nov 15.
An open frame RF probe for high pressure and high temperature MR/MRI measurements was designed, fabricated, and tested. The open frame RF probe was installed inside an MR/MRI compatible metallic core holder, withstanding a maximum pressure and temperature of 5000 psi and 80 °C. The open frame RF probe was tunable for both H and F resonance frequencies with a 0.2 T static magnetic field. The open frame structure was based on simple pillars of PEEK polymer upon which the RF probe was wound. The RF probe was immersed in the high pressure confining fluid during operation. The open frame structure simplified fabrication of the RF probe and significantly reduced the amount of polymeric materials in the core holder. This minimized the MR background signal detected. Phase encoding MRI methods were employed to map the spin density of a sulfur hexafluoride gas saturating a Berea core plug in the core holder. The SF was imaged as a high pressure gas and as a supercritical fluid.
设计、制造并测试了一种用于高压和高温磁共振成像（MR/MRI）测量的开放式框架射频探头。该开放式框架射频探头安装在与MR/MRI兼容的金属芯支架内，可承受最高5000 psi的压力和80°C的温度。在0.2 T静磁场下，该开放式框架射频探头对H和F共振频率均可调谐。开放式框架结构基于聚醚醚酮（PEEK）聚合物的简单支柱，射频探头缠绕在这些支柱上。在操作过程中，射频探头浸没在高压围压流体中。开放式框架结构简化了射频探头的制造，并显著减少了芯支架中聚合物材料的用量。这使检测到的MR背景信号最小化。采用相位编码MRI方法绘制了饱和在芯支架中Berea岩心塞内的六氟化硫气体的自旋密度图。六氟化硫被成像为高压气体和超临界流体。
