The rotate-plus-shift C-arm trajectory: complete CT data with limited angular rotation

The rotate-plus-shift C-arm trajectory: complete CT data with limited angular rotation
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旋转加移位 C 形臂轨迹:具有有限角度旋转的完整 CT 数据

DOI:
10.1117/12.2081925
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
M. Kachelrieß
M. Kachelrieß
中科院分区:
--
文献类型:
--
作者:
L. Ritschl;J. Kuntz;M. Kachelrieß

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在过去十年中,基于 C 形臂的锥形束 CT 成为广泛使用的术中成像方式。通常,C 形臂扫描是使用围绕感兴趣区域的圆形轨迹进行的。因此,必须覆盖至少 180° 加上扇形角的角度范围,以确保完整采样的数据集。这一事实定义了对 C 形臂系统的几何形状和技术规格的一些限制,例如分别较大的 C 半径或较小的 C 开口。在荧光检查等经典 2D 应用中,这些技术修改通常不利于 C 形臂的操作和可用性。本文提出的方法放宽了180°+扇角旋转的约束以获得完整的数据集。所提出的 C 臂轨迹需要对 C 的轨道轴以及理想情况下 C 平面中的两个正交轴进行机动化。轨迹由三部分组成:C 围绕定义的等中心的旋转以及在旋转开始和结束时平行于探测器平面的两个平移运动。将这三个部分组合成一个轨迹,只需使用 180° 负扇形旋转角即可获取完全采样的数据集。为了评估该方法,我们展示了使用移动 C 形臂原型采集的动物和尸体扫描结果。我们预计这种方法转变为临床常规将导致术中 3D 成像在更广泛的临床应用领域得到更广泛的使用。
In the last decade C–arm–based cone–beam CT became a widely used modality for intraoperative imaging. Typically a C–arm scan is performed using a circle–like trajectory around a region of interest. Therefor an angular range of at least 180° plus fan–angle must be covered to ensure a completely sampled data set. This fact defines some constraints on the geometry and technical specifications of a C–arm system, for example a larger C radius or a smaller C opening respectively. These technical modifications are usually not beneficial in terms of handling and usability of the C–arm during classical 2D applications like fluoroscopy. The method proposed in this paper relaxes the constraint of 180◦ plus fan–angle rotation to acquire a complete data set. The proposed C–arm trajectory requires a motorization of the orbital axis of the C and of ideally two orthogonal axis in the C plane. The trajectory consists of three parts: A rotation of the C around a defined iso–center and two translational movements parallel to the detector plane at the begin and at the end of the rotation. Combining these three parts to one trajectory enables for the acquisition of a completely sampled dataset using only 180° minus fan–angle of rotation. To evaluate the method we show animal and cadaver scans acquired with a mobile C-arm prototype. We expect that the transition of this method into clinical routine will lead to a much broader use of intraoperative 3D imaging in a wide field of clinical applications.
使用平面探测器 C 臂系统进行 3D 成像
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
N. Strobel;O. Meissner;J. Boese;T. Brunner;B. Heigl;M. Hoheisel;G. Lauritsch;M. Nagel;M. Pfister;Ernst;B. Scholz;B. Schreiber;M. Spahn;M. Zellerhoff;K. Klingenbeck
通讯作者: K. Klingenbeck
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
发表时间: 2007
期刊: 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
影响因子: --
作者:
R. Tita;T. Lueth
通讯作者: T. Lueth