Oh S, Ramon C, Marks R J, Nelson A C, Meyer M G
Department of Electrical Engineering, University of Washington, Seattle 98195.
IEEE Trans Biomed Eng. 1993 Apr;40(4):323-8. doi: 10.1109/10.222324.
Resolution of biomagnetic images using the technique of the alternating projections is proposed. Our image reconstruction procedure is divided in two steps. First, the biomagnetic inverse problem is solved by use of the projection theorem to reconstruct an initial image of the current distribution from a given magnetic field profile. Although the current distribution thus obtained has poor resolution, it can resemble the original shape of the current distribution. The second step improves the resolution of the reconstructed image by using the method of alternating projections. The procedure assumes that images can be represented by line like elements and involves finding the line like elements based on the initial image and projecting back onto the original solution space. Simulation studies were performed on a set of parallel conductors and a shape of the conductors in the form of letters, UWB@. All conductors were of line like thickness. Restored images closely resemble the original shape of the conductors.
提出了使用交替投影技术来解析生物磁图像。我们的图像重建过程分为两步。首先，利用投影定理解决生物磁逆问题，从给定的磁场分布重建电流分布的初始图像。虽然这样得到的电流分布分辨率较差，但它可以类似于电流分布的原始形状。第二步通过使用交替投影方法提高重建图像的分辨率。该过程假设图像可以由线状元素表示，并涉及基于初始图像找到线状元素并投影回原始解空间。对一组平行导体以及呈字母UWB@形式的导体形状进行了模拟研究。所有导体的厚度均为线状。恢复后的图像与导体的原始形状非常相似。
