Intravascular extended sensitivity (IVES) MRI antennas
Intravascular extended sensitivity (IVES) MRI antennas
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DOI：
10.1002/mrm.10506
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发表时间：
2003-08-01
影响因子：
3.3
通讯作者：
Atalar, E
中科院分区：
文献类型：
--
作者：
Susil, RC;Yeung, CJ;Atalar, E
介绍了一种血管内扩展灵敏度（IVES） MRI天线的设计和应用。该装置是一种无环路天线设计，结合了绝缘、介电涂层和天线鞭缠绕成螺旋形状。由于这种天线产生宽区域的高信噪比，并且允许在设备尖端附近成像，因此它对于成像长腔结构非常有用。为了阐明该装置的设计和功能，对绝缘和天线绕组的影响进行了理论和实验研究。通过增加谐振极长度，绝缘拓宽了可以收集图像的纵向区域（即沿着血管的管腔）。相反，天线绕组通过减小谐振极长度使成像更靠近天线尖端。在20厘米的纵向区域内，本文描述的IVES成像天线产生的系统信噪比约为40,000/r (mL(-1)Hz(1/2))，其中r是到天线轴的径向距离，单位为厘米。与微线圈天线设计相反，这些天线不需要精确定位，并允许在道路组织区域进行成像。在关注天线设计的同时，这项工作也有助于提高我们对无环路天线设计的特性和行为的整体理解。(C) 2003 Wiley-Liss, Inc。
The design and application of an intravascular extended sensitivity (IVES) MRI antenna is described. The device is a loopless antenna design that incorporates both an insulating, dielectric coating and a winding of the antenna whip into a helical shape. Because this antenna produces a broad region of high SNR and also allows for imaging near the tip of the device, it is useful for imaging long, luminal structures. To elucidate the design and function of this device, the effects of both insulation and antenna winding were characterized by theoretical and experimental studies. Insulation broadens the longitudinal region over which images can be collected (i.e., along the lumen of a vessel) by increasing the resonant pole length. Antenna winding, conversely, allows for imaging closer to the tip of the antenna by decreasing the resonant pole length. Over a longitudinal region of 20 cm, the IVES imaging antenna described here produces a system SNR of approximately 40,000/r (mL(-1)Hz(1/2)), where r is the radial distance from the antenna axis in centimeters. As opposed to microcoil antenna designs, these antennas not require exact positioning and allow for imaging over road tissue regions. While focusing on the design of the antenna, this work also serves to enhance our overall understanding of the properties and behavior of the loopless antenna design. (C) 2003 Wiley-Liss, Inc.