Interventional real-time ultrasound imaging with an integrated electromagnetic field generator
Interventional real-time ultrasound imaging with an integrated electromagnetic field generator
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DOI：
10.1007/s11548-014-0990-3
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发表时间：
2014-09-01
影响因子：
3
通讯作者：
Maier-Hein, L.
中科院分区：
文献类型：
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作者：
Maerz, K.;Franz, A. M.;Maier-Hein, L.
超声（US）引导的程序经常被执行用于许多疾病的诊断和治疗。然而，由于图像质量差和视野中医疗器械的可见性不足，超声引导介入存在安全性和手术持续时间限制。为了解决这个问题，我们提出了一种基于移动的电磁场发生器（FG）的介入成像系统。标准US探头与EM FG集成，以允许FG与实时成像的组合移动，以实现（1）对于位于跟踪体积中心附近的医疗器械，（2）由于FG远离大的金属物体而增加了鲁棒性，以及（3）由于不需要FG的耗时放置而降低了设置复杂性。通过评估临床环境中的跟踪和校准精度，对新型集成US-FG成像系统进行了评价。为了证明其临床适用性，在针穿刺过程中对原型US-EMFG探针进行了测试。尽管FG附近存在金属，但连接到US探针的移动的EMFG仍产生了亚毫米的跟踪精度。校准误差在1-2 mm范围内。在US引导的针穿刺的初始体模研究中，靶向误差约为3 mm。US-EMFG组合探头是可行的，有效的用于相对于US图像跟踪医疗器械，具有高精度和鲁棒性，同时保持低硬件复杂度。
Ultrasound (US) guided procedures are frequently performed for diagnosis and treatment of many diseases. However, there are safety and procedure duration limitations in US-guided interventions due to poor image quality and inadequate visibility of medical instruments in the field of view. To address this issue, we propose an interventional imaging system based on a mobile electromagnetic (EM) field generator (FG) attached to a US probe.A standard US probe was integrated with an EM FG to allow combined movement of the FG with real-time imaging to achieve (1) increased tracking accuracy for medical instruments are located near the center of the tracking volume, (2) increased robustness because the FG is distant to large metallic objects, and (3) reduced setup complexity since time-consuming placement of the FG is not required. The new integrated US-FG imaging system was evaluated by assessing tracking and calibration accuracy in a clinical setting. To demonstrate clinical applicability, the prototype US-EMFG probe was tested in needle puncture procedures.The mobile EMFG attached to a US probe yielded sub-millimeter tracking accuracy despite the presence of metal close to the FG. Calibration errors were in the range of 1-2 mm. In an initial phantom study on US-guided needle punctures, targeting errors of about 3 mm were achieved.A combined US-EMFG probe is feasible and effective for tracking medical instruments relative to US images with high accuracy and robustness while keeping hardware complexity low.