Free isocentric 3d imaging and a novel approach for wobble trajectories using a modified standard c-arm
Free isocentric 3d imaging and a novel approach for wobble trajectories using a modified standard c-arm
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免费等中心 3D 成像和使用改进的标准 C 形臂实现摆动轨迹的新颖方法
DOI：
10.1109/iembs.2007.4353318
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Lueth
中科院分区：
文献类型：
--
作者：
R. Tita;T. Lueth
在这篇文章中，作者描述了一个标准的C形臂的自由等中心3D成像的修改。为了提供X射线源和X射线探测器的等中心运动，标准C形臂的被动机构配备有附加的电机和编码器。机器人控制系统在患者周围的等中心路径上移动成像系统。然后使用代数重建技术用重建算法处理所采集的X射线图像。对于速度问题的重建算法是在一个现代的PC图形板上实现的。为了克服由C形臂的135度的有限旋转产生的已知伪影，提出了针对这些系统使用新颖的摆动轨迹。所提出的机器人方法的运动的C形臂的机制，使其能够扩大等中心运动到一个球体的表面。利用新的摆动轨迹，可以显著减少重建伪影。
In this article the authors describes the modifications of an standard c-arm for free isocentric 3D imaging. To provide an isocentric movement of the x-ray source and the x-ray detector the passive mechanism of a standard c-arm was equipped with additional motors and encoders. A robot control system moves the imaging system on an isocentric path around the patient. The acquired x-ray images are then processed with a reconstruction algorithm using the algebraic reconstruction technique. For speed issues the reconstruction algorithm is implemented on a modern PC- graphics board. To overcome the known artifacts produced by the c-arm's limited rotation of 135deg, the use of a novel wobble trajectory is proposed for theses systems. The presented robotic approach for the motion of the c-arm's mechanism allows it to expand the isocentric movement to the surface of a sphere. With the new wobble trajectory the reconstruction artifacts can be significantly reduced.