基于正弦图的正电子发射成像呼吸运动弹性配准校正

Respiratory Motion Correction in Positron Emission Tomography Imaging Using Elastic Registration Based on Sinogram Data

在患者胸部正电子发射成像(PET)过程中,呼吸运动会造成成像质量下降。本文使用三层网格B-样条弹性配准的方法修正重组和降噪后的正弦图来进行呼吸运动校正。使用GATE仿真NCAT呼吸运动体模数据进行实验,结果显示图像质量得到了很大地提高,运动伪影和结构信息得到了修复,表明本文的方法是有效的。

In the process of positron emission tomography （PET） data acquiring, respiratory motion reduces the qual- ity of PET imaging. In this paper, we present a correction method using three level grids B-spline elastic method to correct denoised and reorganized sinograms for respiratory motion correction. Using GATE simulates NCAT respira- tory motion model to generate raw data which are used in experiment, the experiment results showed a significantly improved respiratory image with higher quality of PET, and the motion blur and structural information were fixed. The results proved the method of this paper would be effective for the elastic registration.