Ocali O, Atalar E
The Johns Hopkins University School of Medicine, Department of Radiology, Baltimore, Maryland 21287-0845, USA.
Magn Reson Med. 1997 Jan;37(1):112-8. doi: 10.1002/mrm.1910370116.
Recently, intravascular catheter probes have been developed to increase signal-to-noise ratio (SNR) for MR imaging of blood vessels. Miniaturization of these catheter probes without degrading their performances is very critical in imaging small vessels such as coronary arteries. Catheter coils have a loop incorporated in their structure and have limitations in physical dimensions and electromagnetic properties. The use of a loopless intravascular catheter antenna is proposed to overcome these problems. The catheter antenna is essentially a dipole, which makes a very thin diameter possible, and its electronic circuitry can be placed outside the blood vessels without performance degradation. The theoretical foundation for the design and operation of the catheter antenna is presented. Several catheter antennae, as small as 1.5 French, were constructed and tested on phantoms and rabbits with great success. The catheter antenna has a simple structure and is easy to design, implement, and operate.
最近，已开发出血管内导管探头以提高血管磁共振成像的信噪比（SNR）。在不对其性能造成影响的情况下将这些导管探头小型化，对于诸如冠状动脉等小血管的成像至关重要。导管线圈在其结构中包含一个环，并且在物理尺寸和电磁特性方面存在局限性。为克服这些问题，有人提出使用无环血管内导管天线。该导管天线本质上是一个偶极子，这使得极细的直径成为可能，并且其电子电路可以放置在血管外部而不会导致性能下降。本文介绍了导管天线设计与操作的理论基础。构建了几种小至1.5法式的导管天线，并在模型和兔子身上进行了测试，取得了巨大成功。该导管天线结构简单，易于设计、实现和操作。
