Kim Bong Seok, Boverman Gregory, Newell Jonathan C, Saulnier Gary J, Isaacson David
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Physiol Meas. 2007 Jul;28(7):S57-69. doi: 10.1088/0967-3334/28/7/S05. Epub 2007 Jun 26.
We have developed an EIT system for simultaneous use in a mammography examination, allowing for highly accurate co-registration between the two modalities. In this pre-clinical study, we investigate the importance of properly modeling the interface between the electrodes and the medium being imaged. We have implemented the complete electrode model for a parallel-plane mammography geometry, in which currents are injected into the medium through two planar sets of electrodes above and below the medium. We make use of the ACT4 device to conduct saline-tank experiments showing the improvement of the complete model over an ave-gap model, which ignores both the conductivity of the electrodes and the surface impedance. The experimental results show an improvement in both forward modeling accuracy and in the quality of the resulting reconstructed images using the complete electrode model, as compared to the ave-gap model.
我们开发了一种可在乳腺钼靶检查中同时使用的电阻抗断层成像（EIT）系统，实现了两种模态之间的高精度配准。在这项临床前研究中，我们探究了对电极与被成像介质之间的界面进行恰当建模的重要性。我们针对平行平面乳腺钼靶几何结构实现了完整电极模型，其中电流通过介质上方和下方的两组平面电极注入到介质中。我们利用ACT4设备进行盐水槽实验，结果表明完整模型相对于忽略电极电导率和表面阻抗的平均间隙模型有改进。实验结果显示，与平均间隙模型相比，使用完整电极模型时，正向建模精度以及重建图像质量均有提高。
