Nypan Erik, Tangen Geir Arne, Brekken Reidar, Aadahl Petter, Manstad-Hulaas Frode
Institute of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
Norwegian National Research Centre for Minimally Invasive and Image-Guided Diagnostics and Therapy, St. Olavs Hospital, Trondheim, Norway.
Front Radiol. 2024 Jan 23;4:1320535. doi: 10.3389/fradi.2024.1320535. eCollection 2024.
Electromagnetic tracking of instruments combined with preoperative images can supplement fluoroscopy for guiding endovascular aortic repair (EVAR). The aim of this study was to evaluate the in-vivo accuracy of a vessel-based registration algorithm for matching electromagnetically tracked positions of an endovascular instrument to preoperative computed tomography angiography. Five patients undergoing elective EVAR were included, and a clinically available semi-automatic 3D-3D registration algorithm, based on similarity measures computed over the entire image, was used for reference. Accuracy was reported as target registration error (TRE) evaluated in manually selected anatomic landmarks on bony structures, placed close to the volume-of-interest. The median TRE was 8.2 mm (range: 7.1 mm to 16.1 mm) for the vessel-based registration algorithm, compared to 2.2 mm (range: 1.8 mm to 3.7 mm) for the reference algorithm. This illustrates that registration based on intraoperative electromagnetic tracking is feasible, but the accuracy must be improved before clinical use.
将器械的电磁跟踪与术前影像相结合，可以辅助荧光镜检查来指导血管内主动脉修复术（EVAR）。本研究的目的是评估一种基于血管的配准算法在体内的准确性，该算法用于将血管内器械的电磁跟踪位置与术前计算机断层扫描血管造影相匹配。纳入了5例接受择期EVAR的患者，并使用了一种基于在整个图像上计算的相似性度量的临床可用半自动3D-3D配准算法作为参考。准确性以目标配准误差（TRE）报告，该误差在靠近感兴趣区域的骨结构上手动选择的解剖标志点处进行评估。基于血管的配准算法的TRE中位数为8.2毫米（范围：7.1毫米至16.1毫米），而参考算法的TRE中位数为2.2毫米（范围：1.8毫米至3.7毫米）。这表明基于术中电磁跟踪的配准是可行的，但在临床应用前必须提高其准确性。
