Marmurek Jonathan, Wedlake Chris, Pardasani Utsav, Eagleson Roy, Peters Terry
The University of Western Ontario, London, Ontario, Canada.
Stud Health Technol Inform. 2006;119:367-72.
We present an application of an augmented reality laser projection system in which procedure-specific optimal incision sites, computed from pre-operative image acquisition, are superimposed on a patient to guide port placement in minimally invasive surgery. Tests were conducted to evaluate the fidelity of computed and measured port configurations, and to validate the accuracy with which a surgical tool-tip can be placed at an identified virtual target. A high resolution volumetric image of a thorax phantom was acquired using helical computed tomography imaging. Oriented within the thorax, a phantom organ with marked targets was visualized in a virtual environment. A graphical interface enabled marking the locations of target anatomy, and calculation of a grid of potential port locations along the intercostal rib lines. Optimal configurations of port positions and tool orientations were determined by an objective measure reflecting image-based indices of surgical dexterity, hand-eye alignment, and collision detection. Intra-operative registration of the computed virtual model and the phantom anatomy was performed using an optical tracking system. Initial trials demonstrated that computed and projected port placement provided direct access to target anatomy with an accuracy of 2 mm.
我们展示了一种增强现实激光投影系统的应用，其中根据术前图像采集计算出的特定手术最佳切口位置会叠加在患者身上，以指导微创手术中的端口放置。进行了测试，以评估计算和测量的端口配置的保真度，并验证手术工具尖端放置在已识别虚拟目标处的准确性。使用螺旋计算机断层扫描成像获取了胸部模型的高分辨率体积图像。在胸部内定位后，在虚拟环境中可视化带有标记目标的模型器官。图形界面可用于标记目标解剖结构的位置，并计算沿肋间肋骨线的潜在端口位置网格。端口位置和工具方向的最佳配置由反映基于图像的手术灵活性、手眼对齐和碰撞检测指标的客观测量方法确定。使用光学跟踪系统对计算出的虚拟模型和模型解剖结构进行术中配准。初步试验表明，计算和投影的端口放置能够以2毫米的精度直接到达目标解剖结构。
