SETUP ACCURACY OF THE NOVALIS EXACTRAC 6DOF SYSTEM FOR FRAMELESS RADIOSURGERY
SETUP ACCURACY OF THE NOVALIS EXACTRAC 6DOF SYSTEM FOR FRAMELESS RADIOSURGERY
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DOI：
10.1016/j.ijrobp.2011.01.052
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发表时间：
2012-04-01
影响因子：
7
通讯作者：
De Ridder, Mark
中科院分区：
文献类型：
--
作者：
Gevaert, Thierry;Verellen, Dirk;De Ridder, Mark
目的：使用基于框架定位的立体定向放射外科是治疗良性和恶性病变的成熟技术。相比之下，使用图像引导定位技术的无框架系统的新趋势正在获得主流认可。本研究的目的是测量的检测和定位精度的ExacTrac/Novalis体（ET/NB）的旋转和比较的准确性的框架为基础的radiosurgery technology.Methods和材料：一个程序开发的内部旋转参考计算机断层扫描图像。将系统测得的角度与已知的旋转进行比较。ET/NB的准确性进行了评价与头部体模与七个铅珠插入，安装在治疗床上配备了一个机器人倾斜模块，并测量与数字水位和门户电影。进行多个隐藏目标测试（HTT）以测量用于放射外科手术的不同定位技术的总体准确性（即，结果：ET/NB系统可以检测纵向、横向和垂直旋转的平均精度分别为0.09度（标准差[SD] 0.06度）、0.02度（SD 0.07度）和0.06度（SD 0.14度）的旋转摆位误差。纵向、横向和垂直旋转的平均定位精度分别为0.06度（SD 0.04度）、0.08度（SD 0.06度）和0.08度（SD 0.07度）。HTT的结果显示，整体三维精度为0.76 mm（SD 0.46 mm）的无框技术，0.87 mm（SD 0.44 mm）的可重新定位的面具，和1.19 mm（SD 0.45 mm）的框架为基础的techniques.Conclusions：该研究显示了较高的检测精度和subdegree定位精度。在体模研究的基础上，无框架技术显示出与基于框架的方法相当的准确性。(C)2012 Elsevier Inc.
Purpose: Stereotactic radiosurgery using frame-based positioning is a well-established technique for the treatment of benign and malignant lesions. By contrast, a new trend toward frameless systems using image-guided positioning techniques is gaining mainstream acceptance. This study was designed to measure the detection and positioning accuracy of the ExacTrac/Novalis Body (ET/NB) for rotations and to compare the accuracy of the frameless with the frame-based radiosurgery technique.Methods and Materials: A program was developed in house to rotate reference computed tomography images. The angles measured by the system were compared with the known rotations. The accuracy of ET/NB was evaluated with a head phantom with seven lead beads inserted, mounted on a treatment couch equipped with a robotic tilt module, and was measured with a digital water level and portal films. Multiple hidden target tests (HTT) were performed to measure the overall accuracy of the different positioning techniques for radiosurgery (i.e., frameless and frame-based with relocatable mask or invasive ring, respectively).Results: The ET/NB system can detect rotational setup errors with an average accuracy of 0.09 degrees (standard deviation [SD] 0.06 degrees), 0.02 degrees (SD 0.07 degrees), and 0.06 degrees (SD 0.14 degrees) for longitudinal, lateral, and vertical rotations, respectively. The average positioning accuracy was 0.06 degrees (SD 0.04 degrees), 0.08 degrees (SD 0.06 degrees), and 0.08 degrees (SD 0.07 degrees) for longitudinal, lateral and vertical rotations, respectively. The results of the HTT showed an overall three-dimensional accuracy of 0.76 mm (SD 0.46 mm) for the frameless technique, 0.87 mm (SD 0.44 mm) for the relocatable mask, and 1.19 mm (SD 0.45 mm) for the frame-based technique.Conclusions: The study showed high detection accuracy and a subdegree positioning accuracy. On the basis of phantom studies, the frameless technique showed comparable accuracy to the frame-based approach. (C) 2012 Elsevier Inc.