Key Laboratory for Biomedical Engineering of the Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou, China.
J Magn Reson Imaging. 2011 Nov;34(5):1218-25. doi: 10.1002/jmri.22741.
To develop a postprocessing algorithm that enhances the visibility of intracranial venous vasculature and reduces the artifacts in the display of susceptibility-weighted images (SWI).
Image-domain high-pass filters based on second-order phase difference were applied to the complex 3D SWI data to enhance the susceptibility phase shift of the veins and suppress background signal in SWI. A multivariant statistical parameter was used to suppress the noise in air.
Magnetic resonance (MR) venography with enhanced susceptibility phase shift and reduced off-resonance artifacts was obtained using the proposed filters. The background signal in the 3D MR venography data was well suppressed. Venous vasculature in the peripheral regions of the brain was well depicted and the adverse effect of noise in air in the maximum-intensity projection display of the 3D SWI data was well suppressed.
Image-domain high-pass filtering with second-order phase difference provides an alternative display of 3D SWI data with enhanced visibility of the venous vasculature and effective suppression of artifacts.
开发一种后处理算法，以增强颅内静脉血管的可视性，并减少磁化率加权成像（SWI）显示中的伪影。
对三维 SWI 数据应用基于二阶相位差的空域高通滤波器，以增强静脉的磁化率相位偏移并抑制 SWI 中的背景信号。使用多变量统计参数来抑制空气中的噪声。
使用所提出的滤波器可获得增强磁化率相位偏移和减少离频伪影的磁共振静脉造影。三维 MR 静脉造影数据中的背景信号得到了很好的抑制。脑周边区域的静脉血管得到了很好的描绘，并且三维 SWI 数据的最大强度投影显示中空气噪声的不良影响也得到了很好的抑制。
空域高通滤波结合二阶相位差为增强静脉血管可视性和有效抑制伪影提供了一种替代的三维 SWI 数据显示方法。
