Rapid polarizing field cycling in magnetic resonance imaging

作者：Nathaniel I. Matter, Greig Scott, Thomas Grafendorfer, Albert Macovski, Steven Conolly · 发表于：IEEE Transactions on Medical Imaging · 年份：2005 · DOI：10.1109/tmi.2005.861014 · 被引用次数：56 · 研究领域：Advanced MRI Techniques and Applications、Advanced NMR Techniques and Applications、Atomic and Subatomic Physics Research

We describe the electronics for controlling the independently pulsed polarizing coil in a prepolarized magnetic resonance imaging (PMRI) system and demonstrate performance with free induction decay measurements and in vivo imaging experiments. A PMRI scanner retains all the benefits of acquiring MRI data at low field, but with the higher signal of the polarizing field. Rapidly and efficiently ramping the polarizing coil without disturbing the data acquisition is one of the major challenges of PMRI. With our modular hardware design, we successfully ramp the 0.4-T polarizing coil of a wrist-sized PMRI scanner at up to 100 T/s without causing image artifacts or otherwise degrading data acquisition.