摘要
磁共振成像(MRI)技术因其可以无损伤、无电离辐射、多参数多模态、高分辨率成像特点备受科学家关注,目前MRI技术广泛应用于医学临床,辅助诊断多种疾病[1-2]。灰度不均匀性或者偏差场作为MRT技术的主要缺点表现在对视觉检查和医疗诊断方面存在一定的误差,并且对图像的定量分析有很大的影响。为提高磁共振图像分析可靠性和疾病诊断精度,针对磁共振图像中由于非均匀场产生的灰度不均匀性,提出了同态滤波校正方法。该方法首先对图像的背景区域去除,然后对背景区域做高斯滤波得到非均匀场估计,最后对结果做指数运算即可得到校正后的图像。定性和定量分析实验结果表明,同态滤波方法能够有效校正磁共振图像非均匀场,改善图像质量。
Magnetic resonance imaging （ MRI）technology is used to diagnose a various diseases inmedical clinical because of its no ionizing radiation, multiparameter multimodal and highresolution[1 - 2] . The main shortcomings of MRI is grayscale inhomogeneity and deviation field, causingpoor performance in the visual inspection, medical diagnosis and the quantitative analysis of the image. In order to improve the reliability of magnetic resonance image analysis and the accuracy of disease diagnosis, this paper presents a method to correct the nonuniform field of MRI based on homomorphic filtering. Firstly, the background region of the image is removed, and then the nonuniformfield estimation is obtained by Gaussian filtering of the background region. Finally, the corrected image can be obtained by exponential operation. The results of qualitative and quantitative analysisshow that the method of homomorphic filtering can correct effectively the nonuniform field of magnetic resonance image and improve the image quality.
出处
《江西科学》
2018年第1期14-17,119,共5页
Jiangxi Science
关键词
磁共振成像
非均匀场
灰度不均匀
同态滤波
magnetic resonance imaging
Nonuniform Field
intensity inhomogeneity
homomorphicfiltering
