摘要
磁感应成像是一种利用电磁感应原理重构生物组织电导率分布的非接触式电阻抗成像技术。利用一组亥姆霍兹线圈为激励源,能在成像区域内产生均匀分布的激励磁场,从而能够简化成像算法。系统模型由背景物体、异物、亥姆霍兹线圈和20个检测线圈构成。利用滤波反投影算法重构图像,研究该系统下单目标和双目标的图像重构,并且通过并利用相关系数、归一化均方距离和归一化平均绝对距离3个评估参数分析算法对不同噪声的抑制能力。结果表明,当信噪比≥30 dB时,单目标和双目标异物成像效果接近没有噪声的成像结果。
Magnetic induction imaging is a non-contact electrical impedance imaging technology that reconstructs the distribution of electrical conductivity of biological tissues by the principle of electromagnetic induction.Using a set of Helmholtz coils as the excitation source,a uniformly distributed excitation magnetic field can be produced in the imaging region,thus simplifying the imaging algorithm.The system model is made up of a background object,a foreign object,a Helmholtz coil and 20 detection coils.The filtered back-projection algorithm is utilized to reconstruct the image and the image reconstructions of the single target and dual targets are studied.Moreover,the performance of algorithm in noise suppression can be evaluated by analyzing 3 parameters,namely correlation coefficient,normalized mean square distance and normalized absolute distance.The results showed that when the signal-to-noise ratio was larger than or equal to 30,the imaging results of signal target and dual targets are close to those without noise.
作者
罗霞
罗海军
潘海涛
温开旭
廖勇
范嗣强
LUO Xia;LUO Haijun;PAN Haitao;WEN Kaixu;LIAO Yong;FAN Siqiang(Chongqing Key Laboratory of Photo-Electric Functional Materials/College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)
出处
《中国医学物理学杂志》
CSCD
2018年第11期1281-1286,共6页
Chinese Journal of Medical Physics
基金
国家自然科学基金(51507023
11647098)
重庆市科委基础和前沿研究项目(CSTC2016JCYJA0920)
重庆市教委科学技术研究项目(KJ1703063)
关键词
磁感应成像
滤波反投影
生物组织
噪声抑制
信噪比
magnetic induction tomography
filtered back-projection
biological tissue
noise suppression
signal-to-noise ratio
