Taguchi Katsuyuki, Kudo Hiroyuki
Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, 601 N. Caroline Street, Baltimore, MD21287, USA. ktaguchi@ jhmi.edu
IEEE Trans Med Imaging. 2008;27(7):907-17. doi: 10.1109/TMI.2008.925076.
We develop an approximate fan-beam algorithm to reconstruct an object with time-dependent nonrigid transformation such as the heart. The method is in the form of derivative backprojection filtering with compensation of affine transformations on a local basis. Computer simulations showed the proposed method significantly reduces image artifact due to nonrigid motion. Therefore, with very little motion artifact, the proposed method allowed us to reconstruct images from projections over about one motion cycle, resulting in reduced image noise level down to 40% of the current level.
我们开发了一种近似扇束算法，用于重建具有随时间变化的非刚性变换的物体，如心脏。该方法采用导数反投影滤波形式，并在局部基础上对仿射变换进行补偿。计算机模拟表明，该方法显著减少了由于非刚性运动引起的图像伪影。因此，由于运动伪影非常小，该方法使我们能够从大约一个运动周期的投影中重建图像，从而将图像噪声水平降低到当前水平的40%。
