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使用双回波投影对带有铁磁性尖端的介入导管进行跟踪。

Tracking of an interventional catheter with a ferromagnetic tip using dual-echo projections.

机构信息

Department of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.

出版信息

J Magn Reson. 2013 Sep;234:176-83. doi: 10.1016/j.jmr.2013.06.020. Epub 2013 Jul 9.

Abstract

Interventional devices with ferromagnetic components can be manipulated remotely using forces induced by the MRI gradients. To deflect the tip of an endovascular catheter, large ferromagnetic spheres of 2 mm diameter are required to exert sufficiently high magnetic forces; however, tracking of these devices is difficult due to the large image artifacts. In this study, a new dual-echo technique is proposed to improve the stability of localizing and tracking medical devices with ferromagnetic components. MR tracking methods with selective off-resonant excitation and phase compensation with a rephasing gradient can detect ferromagnetic spheres up to a diameter of 1 mm only. In this work, a dual-echo technique is used with two rephasing gradients to stabilize the off-set localization. With rephasing being applied in orthogonal directions, an SNR of 5 was achieved in the signal projections. Compared to a single-echo acquisition the dual-echo method reduces the position error in a phantom from 8 mm to 1.6 mm. In an in vivo study a tracking precision of 4 mm was measured without steering gradients at an image update rate of 2 images per second. Steering experiments were successfully performed with a prototype catheter with ferromagnetic sphere in an aorta phantom and in the vena cava of a pig.

摘要

具有铁磁性组件的介入设备可以通过 MRI 梯度产生的力进行远程操纵。为了使血管内导管的尖端发生偏转,需要施加足够高的磁力,因此需要使用直径为 2 毫米的大铁磁球;然而,由于图像伪影较大,这些设备的跟踪较为困难。在这项研究中,提出了一种新的双回波技术,以提高带有铁磁性组件的医疗设备的定位和跟踪稳定性。具有选择性失谐激励和相位补偿的 MR 跟踪方法仅能检测到直径最大为 1 毫米的铁磁球。在这项工作中,使用了两个重聚梯度的双回波技术来稳定偏移定位。在正交方向上应用重聚时,在信号投影中实现了 5 的 SNR。与单回波采集相比,双回波方法将在体模中的位置误差从 8 毫米减小到 1.6 毫米。在一项体内研究中,在没有导向梯度的情况下,以每秒 2 幅图像的图像更新率测量到 4 毫米的跟踪精度。在猪的主动脉体模和腔静脉中成功地使用带有铁磁球的原型导管进行了转向实验。

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