Projector-basted augmented reality for intuitive intraoperative guidance in image-guided 3D interstitial brachytherapy
Projector-basted augmented reality for intuitive intraoperative guidance in image-guided 3D interstitial brachytherapy
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DOI：
10.1016/j.ijrobp.2007.10.048
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发表时间：
2008-03-01
影响因子：
7
通讯作者：
Harms, Wolfgang
中科院分区：
文献类型：
--
作者：
Krempien, Robert;Hoppe, Harald;Harms, Wolfgang
目的：本研究的目的是在实时图像引导间质性近距离放射治疗中实现增强现实，以实现直观的实时术中定位。方法与材料：开发的系统由一个普通的视频投影仪、两个高分辨率电荷耦合器件相机和一个现成的笔记本组成。投影仪作为一种扫描设备，通过投射编码光模式来登记患者，并将手术场与计划数据和任意颜色的附加信息叠加在一起。非固定患者的后续运动是通过附着在患者身上的立体跟踪被动标记来检测的。结果：在第一项临床研究中，我们评估了从图像采集到数据投影的整个过程链，并确定了10例植入患者的总体准确性。所描述的方法使外科医生能够在任何术前分割和三角形表面（皮肤）上可视化规划数据，并在手术过程中具有直接的视线。此外，跟踪系统允许根据患者当前位置动态调整数据，从而消除了刚性固定的需要。由于软组织移位，我们通过移动患者获得的平均偏差为1.1 mm，而改变投影仪的位置导致的平均偏差为0.9 mm。种植体所有针的平均偏差为1.4 mm（范围0.3-2.7 mm）。结论：所研制的低成本增强现实系统在间质性近距离治疗中是准确可行的。该系统满足临床需求，可实现术中直观的实时定位和针植入术监测。(C) 2008爱思唯尔公司
Purpose: The aim of this study is to implement augmented reality in real-time image-guided interstitial brachytherapy to allow an intuitive real-time intraoperative orientation.Methods and Materials: The developed system consists of a common video projector, two high-resolution charge coupled device cameras, and an off-the-shelf notebook. The projector was used as a scanning device by projecting coded-light patterns to register the patient and superimpose the operating field with planning data and additional information in arbitrary colors. Subsequent movements of the nonfixed patient were detected by means of stereoscopically tracking passive markers attached to the patient.Results: In a first clinical study, we evaluated the whole process chain from image acquisition to data projection and determined overall accuracy with 10 patients undergoing implantation. The described method enabled the surgeon to visualize planning data on top of any preoperatively segmented and triangulated surface (skin) with direct line of sight during the operation. Furthermore, the tracking system allowed dynamic adjustment of the data to the patient's current position and therefore eliminated the need for rigid fixation. Because of soft-part displacement, we obtained an average deviation of 1.1 mm by moving the patient, whereas changing the projector's position resulted in an average deviation of 0.9 mm. Mean deviation of all needles of an implant was 1.4 mm (range, 0.3-2.7 mm).Conclusions: The developed low-cost augmented-reality system proved to be accurate and feasible in interstitial brachytherapy. The system meets clinical demands and enables intuitive real-time intraoperative orientation and monitoring of needle implantation. (C) 2008 Elsevier Inc.