RF field visualization of RF ablation at the Larmor frequency.
RF field visualization of RF ablation at the Larmor frequency.
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DOI：
10.1109/tmi.2011.2162248
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发表时间：
2012-04
影响因子：
10.6
通讯作者：
Scott G
中科院分区：
文献类型：
--
作者：
Shultz K;Stang P;Kerr A;Pauly J;Scott G
射频消融是一种有效的肿瘤微创治疗方法。困难的一个主要来源是监测和控制消融区域。目前，射频消融是在460 kHz下进行的，鉴于其温度监测和肿瘤可视化的能力，MRI可以发挥作用。如果在MRI Larmor频率下进行消融，则可以使用B1场标测的MR功能直接可视化消融电流产生的射频场。使RF场可视化可以实现对消融电流的更好控制，从而实现对损伤形状和尺寸的更好控制并提高可重复性。我们证明了在64 MHz下进行射频消融的可行性，并显示了消融射频场成像的初步结果。消融后射频场显示消融区域的电流密度增加，与消融组织电导率的增加一致。
Radiofrequency ablation is an effective minimally invasive treatment for tumors. One primary source of difficulty is monitoring and controlling the ablation region. Currently, RF ablation is performed at 460 kHz, for which MRI could play a role given its capability for temperature monitoring and tumor visualization. If instead the ablation were to be performed at the MRI Larmor frequency, then the MR capability for B1 field mapping could be used to directly visualize the RF fields created by the ablation currents. Visualizing the RF fields may enable better control of the ablation currents, enabling better control of lesion shape and size and improving repeatability. We demonstrate the feasibility of performing RF ablations at 64 MHz and show preliminary results from imaging the RF fields from the ablation. The post-ablation RF fields show an increase in current density in the ablated region, consistent with an increase in conductivity of the ablated tissue.