Cook R D, Saulnier G J, Gisser D G, Goble J C, Newell J C, Isaacson D
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180.
IEEE Trans Biomed Eng. 1994 Aug;41(8):713-22. doi: 10.1109/10.310086.
This paper presents the design, implementation, and performance of Rensselaer's third-generation Adaptive Current Tomograph, ACT3. This system uses 32 current sources and 32 phase-sensitive voltmeters to make a 32-electrode system that is capable of applying arbitrary spatial patterns of current. The instrumentation provides 16 b precision on both the current values and the real and reactive voltage readings and can collect the data for a single image in 133 ms. Additionally, the instrument is able to automatically calibrate its voltmeters and current sources and adjust the current source output impedance under computer control. The major system components are discussed in detail and performance results are given. Images obtained using stationary agar targets and a moving pendulum in a phantom as well as in vivo resistivity profiles showing human respiration are shown.
本文介绍了伦斯勒理工学院第三代自适应电流断层扫描仪ACT3的设计、实现和性能。该系统使用32个电流源和32个相敏电压表组成一个32电极系统，能够施加任意空间电流模式。该仪器在电流值以及有功和无功电压读数方面都提供16位精度，并且能够在133毫秒内采集单幅图像的数据。此外，该仪器能够在计算机控制下自动校准其电压表和电流源，并调整电流源输出阻抗。文中详细讨论了主要系统组件并给出了性能结果。展示了使用静态琼脂靶标、模型中的移动摆锤以及显示人体呼吸的体内电阻率分布图所获得的图像。
