Department of Radiology, University of Wisconsin, Madison, WI, USA.
J Magn Reson Imaging. 2011 Apr;33(4):995-1002. doi: 10.1002/jmri.22506.
To demonstrate the feasibility of using a single intravascular radiofrequency (RF) probe connected to the external magnetic resonance imaging (MRI) system via a single coaxial cable to perform active tip tracking and catheter visualization and high signal-to-noise ratio (SNR) intravascular imaging.
A multimode intravascular RF coil was constructed on a 6F balloon catheter and interfaced to a 1.5T MRI scanner via a decoupling circuit. Bench measurements of coil impedances were followed by imaging experiments in saline and phantoms.
The multimode coil behaves as an inductively coupled transmit coil. The forward-looking capability of 6 mm was measured. A greater than 3-fold increase in SNR compared to conventional imaging using optimized external coil was demonstrated. Simultaneous active tip tracking and catheter visualization was demonstrated.
It is feasible to perform 1) active tip tracking, 2) catheter visualization, and 3) high SNR imaging using a single multimode intravascular RF coil that is connected to the external system via a single coaxial cable.
展示使用通过单根同轴电缆连接到外部磁共振成像（MRI）系统的单个血管内射频（RF）探头进行主动尖端跟踪和导管可视化以及高信噪比（SNR）血管内成像的可行性。
在 6F 球囊导管上构建了多模血管内 RF 线圈，并通过去耦电路与 1.5T MRI 扫描仪连接。进行了线圈阻抗的基准测量，然后在盐水中和模型中进行了成像实验。
多模线圈表现为感应耦合的发射线圈。测量到 6mm 的前视能力。与使用优化的外部线圈进行的常规成像相比，SNR 提高了 3 倍以上。同时实现了主动尖端跟踪和导管可视化。
使用通过单根同轴电缆连接到外部系统的单个多模血管内 RF 线圈，可实现 1）主动尖端跟踪，2）导管可视化和 3）高 SNR 成像。
