Percutaneous MR-guided interventions using an optical Moire Phase tracking system: Initial results
Percutaneous MR-guided interventions using an optical Moire Phase tracking system: Initial results
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DOI：
10.1371/journal.pone.0205394
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发表时间：
2018-10-16
期刊：
影响因子：
3.7
通讯作者：
Hensen, Bennet
中科院分区：
文献类型：
--
作者：
Kaegebein, Urte;Godenschweger, Frank;Hensen, Bennet
本研究的目的是开发和评价使用光学莫尔相位跟踪（MPT）进行磁共振（MR）引导经皮介入的实时引导支持。修改了梯度回波序列（能够通过MPT系统进行实时位置更新），以基于针背面的四个刚性连接MPT标记实现针引导。两个垂直的成像平面沿校准针自动沿着对齐，并以其尖端为中心。为便于用户指导，添加了关于针轨迹和头端至靶点距离的附加信息作为图像叠加。图像和引导信息均显示在室内监视器上，以便于MR引导介入。由4名经验丰富的介入放射科医生和4名新手对3 T宽孔MRI系统（80次穿刺）上嵌入定制体模中的橡胶O形环进行了导向支持评价。分析了皮肤到目标时间、用户误差、系统误差和总误差。平均皮肤至目标时间为146 s +/-68 s，专家和新手之间无统计学显著差异。所有方向的平均用户误差（0.91 mm +/-0.43 mm）、系统误差（0.53 mm +/-0.27 mm）和总误差（0.99 mm +/-0.47 mm）均较低。专家组和新手组在用户错误、系统错误和总错误方面的差异无统计学意义。所呈现的跟踪和图像引导系统与用户界面相结合，在刺穿磁铁的同时提供对成像平面的连续和交互式控制，为有经验和无经验的用户提供准确的实时反馈。
The aim of this study was the development and evaluation of a real-time guidance support using optical Moire Phase Tracking (MPT) for magnetic resonance (MR) guided percutaneous interventions. A gradient echo sequence, capable of real-time position updates by the MPT system, was modified to enable needle guidance based on four rigidly attached MPT markers at the back of a needle. Two perpendicular imaging planes were automatically aligned along the calibrated needle and centered at its tip. For user guidance, additional information about the needle trajectory and the tip to target distance were added as image overlay. Both, images and guiding information were displayed on the in-room monitor to facilitate MR guided interventions. The guidance support was evaluated by four experienced interventional radiologists and four novices targeting rubber O-rings embedded in a custom-made phantom on a 3T wide-bore MRI system (80 punctures). The skin to target time, user error, system error and total error were analyzed. The mean skin to target time was 146s +/- 68s with no statistically significant difference between experts and novices. A low mean user error (0.91mm +/- 0.43mm), system error (0.53mm +/- 0.27mm) and total error (0.99mm +/- 0.47mm) was reached in all directions. No statistically significant difference in user error, system error and total error could be found between experts and novices. The presented tracking and image guidance system combined with the user interface offers continuous and interactive control of the imaging plane while puncturing in the magnet enabling accurate real-time feedback for both, experienced and non-experienced users.