Non-circular CBCT orbit design and realization on a clinical robotic C-arm for metal artifact reduction.
Non-circular CBCT orbit design and realization on a clinical robotic C-arm for metal artifact reduction.
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用于减少金属伪影的临床机器人 C 形臂上的非圆形 CBCT 轨道设计和实现。
DOI：
10.1117/12.2612448
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Stayman,JWebster
中科院分区：
文献类型：
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作者：
Ma,Yiqun;Gang,GraceJ;Ehtiati,Tina;Reynolds,Tess;Russ,Tom;Wang,Wenying;Weiss,Clifford;Theodore,Nicholas;Hong,Kelvin;Siewerdsen,Jeffrey;Stayman,JWebster
金属伪影一直是锥形束CT （CBCT）的难点，尤其是术中成像。金属手术工具和植入物经常出现在视野中，它们会严重衰减x射线，从而导致数据丢失问题。最近，越来越多的术中成像系统，如机器人c臂，能够在非圆形轨道上进行数据采集。这种轨迹可以潜在地改善采样和数据完整性，以解决金属引起的数据丢失问题，从而减少或消除相关的图像伪影。在这项工作中，我们扩展了之前的理论和实验工作，并在临床机器人c臂（Siemens Artis zeego）上实现了用于金属伪迹减少的非圆轨道。为了最大限度地发挥临床翻译的潜力，我们将我们的实现限制为标准的内置运动和数据收集功能，也可用于其他zeigo系统，并在定位和运动的物理约束和限制下工作。使用定制的软件工具进行数据提取、处理、校准和重建。我们演示了使用包含椎弓根螺钉的假体进行脊柱固定的非圆形轨道和由此产生的图像质量。与标准的圆形CBCT轨道相比，这些非圆形轨道显示出明显减少的金属伪影。这些结果表明，当金属工具或植入物存在于视场中时，术中CBCT成像的图像质量有很大的改善潜力。
Metal artifacts have been a difficult challenge for cone-beam CT (CBCT), especially for intraoperative imaging. Metal surgical tools and implants are often present in the field of view and can attenuate X-rays so heavily that they essentially create a missing-data problem. Recently, an increasing number of intra-operative imaging systems such as robotic C-arms are capable of non-circular orbits for data acquisition. Such trajectories can potentially improve sampling and the degree of data completeness to solve the metal-induced missing-data problem, thereby reducing or eliminating the associated image artifacts. In this work, we extend our prior theoretical and experimental work and implement non-circular orbits for metal artifact reduction on a clinical robotic C-arm (Siemens Artis zeego). To maximize the potential for clinical translation, we restrict our implementation to standard built-in motion and data collection functions, also available on other zeego systems, and work within the physical constraints and limitations on positioning and motion. Customized software tools for data extraction, processing, calibration, and reconstruction are used. We demonstrate example non-circular orbits and the resulting image quality using a phantom containing pedicle screws for spine fixation. As compared with a standard circular CBCT orbit, these non-circular orbits exhibit significantly reduced metal artifacts. These results suggest a high potential for image quality improvements for intraoperative CBCT imaging when metal tools or implants are present in the field-of-view.