摘要
研究将NOSER成像算法应用到电阻抗成像中的APT驱动模式的成像性能。APT模式采用单一电流源,硬件紧凑易于实现。NOSER算法基于最小二乘法,以一个均匀电阻率分布作为初值,取牛顿法迭代算法的第一步。给出在APT系统应用NOSER算法所需各个计算步骤的推导过程和分析,综合形成一种在硬件上易于实现,又在重构图像上有较好分辨率的成像方式。仿真结果表明,在APT系统上应用NOSER算法,获得了优于广泛采用的反投影算法的成像性能。
This paper focuses on the imaging performance of applying the NOSER static algorithm in APT driven pattern in electrical impedance tomography. Using single current source, the hardware of APT system is compact and easy to design. The modified NOSER algorithm is based on the least-square method, taking the first step of Newton iterative method and using homogeneous resistivity distribution as the initial value. The modified NOSER algorithm applied on APT driven pattern was deduced, and each step of calculation was given corresponding to the analysis. The proposed tomography type integrating APT driven pattern with NOSER algorithm was easy for the hardware system to be established. The simulation results showed that the resolution of images reconstructed by NOSER algorithm in APT system was better than that of back projection algorithm which has been widely used.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2008年第3期321-325,共5页
Chinese Journal of Biomedical Engineering
基金
国家863重大项目(2006AA02Z4B7)
国家自然科学基金重点项目(50077026)
