三维电阻抗断层成像仿真研究及图像重建质量评价  

Simulation Research on Three Dimension Electrical Impedance Tomography and Evaluation of Image Reconstruction Quality

作　　者：邓娟[1] 魏庆国[1] 沙洪[2] 赵舒[2] 王妍[2] 任超世[2] 李福生[3] 

机构地区：[1]南昌大学信息工程学院,南昌330031 [2]中国医学科学院&北京协和医学院生物医学工程研究所,天津300192 [3]中国人民解放军第二九一医院,包头014040

出　　处：《生物医学工程学杂志》2013年第6期1195-1199,共5页Journal of Biomedical Engineering

基　　金：江西省自然科学基金青年基金资助项目(20122BAB211020);国家自然科学基金青年基金资助项目(31000449)

摘　　要：三维电阻抗断层成像(3D-EIT)近年来已成为EIT领域的重要研究分支,研究三维场域中不同位置单目标和多目标的成像、成像效果定量评价方法十分必要。通过有限元法将3D-EIT场域离散为正方体单元,对位于场域中心、中间、靠近场域边缘的单目标,以及近场域边缘的两个和四个目标模型,采用Tikhonov-Noser算法仿真成像,引入图像误差函数ER和结构相似度函数SSIM评价成像质量。结果显示:当单个目标由场域中心向边缘移动时,ER逐渐增大,SSIM逐渐减小,成像质量下降;近场域边缘多目标成像中,ER和SSIM随目标个数增加分别增大和减小,成像质量下降。Tikhonov-Noser是较为有效的3D-EIT成像算法。ER和SSIM适合3D-EIT图像特征,可从成像误差和图像结构质量这两个不同的角度定量评价成像结果。Three dimensional electrical impedance tomography （3D-EIT） became an important branch of EIT re- cently. It is important to research imaging and image quality evaluation methods for single targets of different posi- tions and multi-targets in 3D field. Using finite element subdivision method, 3D-EIT field was dispersed into cube u- nit in the present study for models with single target located in the center of field, middle of field, and near to the edge, respectively. For models with two targets and four targets near to the field edge, Tikhonov-Noser algorithm was adopted in image reconstruction. Imaging error function ER and structure similarity degree function SSIM were introduced to evaluate the reconstructed images. For the models with signal target, with the movement of the target from the center to the edge of the field, the value of ER increased and SSIM decreased, and reconstruction quality de- creased. For the models with multi-targets near to the field edge, ER and SSIM increased and decreased respectively with the increase of target number, mage quality also decreased. Tikhonov-Noser algorithm is an effective 3D-EIT algorithm. ER and SSIM are adaptive for the characteristic of 3D-EIT images, and it can quantitatively evaluate the 3D-EIT imaging effect from the two perspective of imaging error and structure quality.

关 键 词：三维电阻抗断层成像 仿真 Tikhonov—Noser算法 评价 

分 类 号：R318.04[医药卫生—生物医学工程]