Tamura Shinichi, Hirano Masatsugu, Chen Xin, Sato Yoshinobu, Narumi Yoshifumi, Hori Masatoshi, Takahashi Satoru, Nakamura Hironobu
Division of Interdisciplinary Image Analysis, Osaka University Medical School, Suita City, Japan.
IEEE Trans Biomed Eng. 2002 Oct;49(10):1187-94. doi: 10.1109/TBME.2002.803517.
To avoid or reduce the X-ray exposure in endoscopic examinations and therapy, as an alternative to the conventional two-dimensional X-ray fluoroscopy we are developing an intrabody navigation system that can directly measure and visualize the three-dimensional (3-D) position of the tip and the trace of an ultrasound endoscope. The proposed system can identify the 3-D location and direction of the endoscope probe inserted into the body to furnish endoscopic images. A marker transducer(s) placed on the surface of the body transmits ultrasound pulses, which are visualized as a marker synchronized to the scanning of the endoscope. The position (direction and distance of the marker transducer(s) outside the body relative to the scanning probe inside the body) of the marker is detected and measured in the scanned image of the ultrasound endoscope. Further, an optical localizer locates the marker transducer(s) with six degrees of freedom. Thus, the proposed method performs inside-body 3-D localization by utilizing the inherent image reconstruction function of the ultrasound endoscope, and is able to be used with currently available commercial ultrasound image scanners. The system may be envisaged as a kind of global positioning system for intrabody navigation.
为了避免或减少内镜检查和治疗中的X射线暴露，作为传统二维X射线荧光透视的替代方法，我们正在开发一种体内导航系统，该系统可以直接测量并可视化超声内镜尖端的三维（3-D）位置及其轨迹。所提出的系统能够识别插入体内的内镜探头的三维位置和方向，以提供内镜图像。放置在身体表面的标记换能器发射超声脉冲，这些脉冲在与内镜扫描同步的标记中可视化。在内镜超声扫描图像中检测并测量标记的位置（体外标记换能器相对于体内扫描探头的方向和距离）。此外，光学定位器以六个自由度定位标记换能器。因此，所提出的方法利用超声内镜固有的图像重建功能进行体内三维定位，并且能够与目前可用的商用超声图像扫描仪一起使用。该系统可以被设想为一种用于体内导航的全球定位系统。
