用反卷积法校正X线图像散射的方法

在数字Ｘ线摄影中，散射造成了图像对比度的下降，在影像增器－电视链成像系统中来自病人的散射和来自探测器系统的眩光更是恶化图像质量的主要原因。为了提高数字Ｘ线图像的质量，我们利用高斯曲线近似散射点扩展函数，并在一特定的系统上用实验的方法确定了散射量ρ和散射分布参数σ，

Employing Deconvolution Method for Correcting Scatter in Radiography

It is well known that the scattered-radiation (SR) results in degradation of the images contrast indigital X-ray radiograph. The main reason affecting radiographic image quality is the SR arising from interaction ofthe photons with object being radiographed and veiling glare from detector system in the II-TV chai imaging system.With the aim of improving the image quality, we employed the Gaussian function to approximate the scatteredpoint spread function(PSF) and determined the fraction of SR, P and the parameter, o experimentally on anindividual system; then we built an inverse filter to process the digital chest X-ray images, which were acquiredwith the same system and transformed in 2-D Fourier tansform operation. The images processed were corrected byusing a variable weihting factor and the resulting images are shown in this paper. The method provides a usefulway for solving the problem of correction of the SR in digital X-ray images.