A new device for fiducial registration of image-guided navigation system for liver RFA
A new device for fiducial registration of image-guided navigation system for liver RFA
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一种用于肝脏射频消融图像引导导航系统基准配准的新装置
DOI：
10.1007/s11548-017-1647-9
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发表时间：
2017
影响因子：
3
通讯作者：
Maeda Shin
中科院分区：
文献类型：
--
作者：
Doba Nobutaka;Fukuda Hiroyuki;Numata Kazushi;Hao Yoshiteru;Hara Kouji;Nozaki Akito;Kondo Masaaki;Chuma Makoto;Tanaka Katsuaki;Takebayashi Shigeo;Koizumi Norihiro;Kobayashi Akira;Tokuda Junichi;Maeda Shin
目的超声引导下射频消融治疗肝脏肿瘤已被广泛应用。然而，区分肿瘤和针头往往是困难的，因为射频消融诱导凝固造成的空化。不清晰的超声图像可能导致并发症和肿瘤残留。因此，基于基准配准的图像引导导航系统已经被开发出来。基准点通常设置在患者的皮肤上。但是使用内部基准点可以提高导航的精度。方法以3D Slicer为导航软件，Polaris Vicra为位置传感器，以腹部三维体模中的两个靶肿瘤为穿刺靶点。此外，还发明了一种能够获得体内跟踪坐标的新装置。首先，使用3D Slicer从CT图像构建二维重新切片图像。在二维重新切片图像上显示虚拟针，反映基准配准后实际针的移动。使用三组基准点配置的体模实验：一个传统的情况下，仅使用表面点，和两个情况下，其中的目标肿瘤的中心被选为基准点进行。对于每种配置，一名外科医生在3D切片仪显示的指导下对每个靶肿瘤穿刺10次。最后，统计分析检查穿刺误差performed.ResultsThe穿刺误差为每个靶肿瘤时，靶肿瘤的中心是作为基准点之一，结论本研究介绍了一种新的装置，使用内部基准点，并建议图像的准确性，通过使用新设备，可以改进用于肝脏RFA的引导导航系统。
PurposeRadiofrequency ablation for liver tumors (liver RFA) is widely performed under ultrasound guidance. However, discriminating between the tumor and the needle is often difficult because of cavitation caused by RFA-induced coagulation. An unclear ultrasound image can lead to complications and tumor residue. Therefore, image-guided navigation systems based on fiducial registration have been developed. Fiducial points are usually set on a patient’s skin. But the use of internal fiducial points can improve the accuracy of navigation. In this study, a new device is introduced to use internal fiducial points using 2D US.Methods3D Slicer as the navigation software, Polaris Vicra as the position sensor, and two target tumors in a 3D abdominal phantom as puncture targets were used. Also, a new device that makes it possible to obtain tracking coordinates in the body was invented. First, two-dimensional reslice images from the CT images using 3D Slicer were built. A virtual needle was displayed on the two-dimensional reslice image, reflecting the movement of the actual needle after fiducial registration. A phantom experiment using three sets of fiducial point configurations: one conventional case using only surface points, and two cases in which the center of the target tumor was selected as a fiducial point was performed. For each configuration, one surgeon punctured each target tumor ten times under guidance from the 3D Slicer display. Finally, a statistical analysis examining the puncture error was performed.ResultsThe puncture error for each target tumor decreased significantly when the center of the target tumor was included as one of the fiducial points, compared with when only surface points were used.ConclusionThis study introduces a new device to use internal fiducial points and suggests that the accuracy of image-guided navigation systems for liver RFA can be improved by using the new device.