Nakajima Y, Oyama H, Sawada A, Muroi K
Mitsubishi Electric Corp. Information Technology R&D Center, Kanagawa, Japan.
Stud Health Technol Inform. 2000;70:230-2.
We present the system design and the methods of video-based guidance to assist with brain tumor biopsy procedures. The system comprises of a three-dimensional (3-D) position sensor, a CCD camera, a liquid crystal display (LCD) and a graphics computer equipped with a video capture board. The markers for positional measurement are attached to the CCD camera, a surgical tool, and the patient head. In order to be integrated into the camera-viewing capacity, 3-D images of the head and guidance indicators are visualized to form a life like video image. For reliable guidance, we also use the surgical plan, called the "safety map", which is a sphere surface highlighting the covering area of anatomically significant tissues and obstacles around the target for the indication of the biopsy needle's insertion starting-point. The safety map can be visualized in exactly the same way as it would be in a real life situation. The preliminary experiments were performed at the National Cancer Center. A high degree of flexibility in terms of views was created by using general apparatuses which are a CCD camera and a LCD. The display of the safety map enabled a successful completion of both craniotomy and biopsy needle insertion procedures.
我们介绍了用于辅助脑肿瘤活检手术的基于视频的引导系统设计和方法。该系统由一个三维（3-D）位置传感器、一个电荷耦合器件（CCD）相机、一个液晶显示器（LCD）以及一台配备视频采集卡的图形计算机组成。用于位置测量的标记物附着在CCD相机、手术工具和患者头部上。为了融入相机的视野范围，头部的三维图像和引导指示器被可视化，以形成逼真的视频图像。为了实现可靠的引导，我们还使用了一种名为“安全地图”的手术计划，它是一个球体表面，突出显示了解剖学上重要组织的覆盖区域以及目标周围的障碍物，用于指示活检针的插入起点。安全地图可以以与实际情况完全相同的方式进行可视化。初步实验在国家癌症中心进行。通过使用普通设备（一个CCD相机和一个LCD），在视野方面创造了高度的灵活性。安全地图的显示使得开颅手术和活检针插入手术都得以成功完成。
