Background-suppressed MR venography of the brain using magnitude data: a high-pass filtering approach.

Background-suppressed MR venography of the brain using magnitude data: a high-pass filtering approach.
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使用幅度数据进行背景抑制的大脑 MR 静脉造影:一种高通滤波方法。

DOI:
10.1155/2014/812785
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发表时间:
2014
影响因子:
--
通讯作者:
Du YP
Du YP
中科院分区:
工程技术4区
文献类型:
--
作者:
Jin Z;Xia L;Zhang M;Du YP

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常规磁敏感加权成像(SWI)利用相位和幅度数据来增强静脉血管系统的显示,因此,在磁场严重不均匀的区域以及最小强度投影中大脑周边区域会出现信号丢失。本研究的目的是通过在后处理中抑制背景信号来提高静脉血管系统的可见度并减少静脉造影中的伪影。在数据采集后,将具有倒置汉明窗或倒置费米窗的高通滤波器应用于幅度图像的傅里叶域,以提高大脑中静脉血管系统的可见度。高通滤波方法具有提高小静脉可见度、减少失谐伪影、减少投影中大脑周边区域的信号丢失以及几乎完全抑制背景信号的优点。所提出的后处理技术仅使用幅度数据对小静脉血管系统的可视化是有效的。
Conventional susceptibility-weighted imaging (SWI) uses both phase and magnitude data for the enhancement of venous vasculature and, thus, is subject to signal loss in regions with severe field inhomogeneity and in the peripheral regions of the brain in the minimum-intensity projection. The purpose of this study is to enhance the visibility of the venous vasculature and reduce the artifacts in the venography by suppressing the background signal in postprocessing. A high-pass filter with an inverted Hamming window or an inverted Fermi window was applied to the Fourier domain of the magnitude images to enhance the visibility of the venous vasculature in the brain after data acquisition. The high-pass filtering approach has the advantages of enhancing the visibility of small veins, diminishing the off-resonance artifact, reducing signal loss in the peripheral regions of the brain in projection, and nearly completely suppressing the background signal. The proposed postprocessing technique is effective for the visualization of small venous vasculature using the magnitude data alone.
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