Reducing contrast contamination in radial turbo-spin-echo acquisitions by combining a narrow-band KWIC filter with parallel imaging.
Reducing contrast contamination in radial turbo-spin-echo acquisitions by combining a narrow-band KWIC filter with parallel imaging.
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DOI：
10.1002/mrm.25081
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发表时间：
2014-12
影响因子：
3.3
通讯作者：
Blaimer, Martin
中科院分区：
文献类型：
--
作者：
Neumann, Daniel;Breuer, Felix A.;Voelker, Michael;Brandt, Tobias;Griswold, Mark A.;Jakob, Peter M.;Blaimer, Martin
笛卡尔旋转回波(TSE)和径向TSE图像通常是通过将包含不同对比度信息的数据组装到单个k空间中来重建的。这种方法会导致图像中的对比度贡献混合，这可能会降低图像的诊断价值。这项工作的目标是通过减少具有不需要的对比度信息的信号的贡献来提高径向TSE采集的图像对比度。径向TSE采集允许使用k空间加权图像对比度(KWIC)过滤器重建具有不同T2对比度的多个图像。在本工作中，通过减小KWIC滤光片的带宽来提高图像对比度。从所需回波时间附近的小时间范围内选择用于重建单个图像的数据。所得到的数据集是欠采样的，因此应用迭代并行成像算法来消除混叠伪影。与笛卡尔TSE图像或常规KWIC重建的放射状TSE图像相比，用该方法重建的人脑的放射状TSE图像具有更好的对比度。提出的方法从放射状TSE数据提供多对比度图像，具有类似于多自旋回波图像的对比度。大大减少了不需要的对比权重造成的污染。
Cartesian turbo spin-echo (TSE) and radial TSE images are usually reconstructed by assembling data containing different contrast information into a single k-space. This approach results in mixed contrast contributions in the images, which may reduce their diagnostic value. The goal of this work is to improve the image contrast from radial TSE acquisitions by reducing the contribution of signals with undesired contrast information. Radial TSE acquisitions allow the reconstruction of multiple images with different T2 contrasts using the k-space weighted image contrast (KWIC) filter. In this work, the image contrast is improved by reducing the band-width of the KWIC filter. Data for the reconstruction of a single image are selected from within a small temporal range around the desired echo time. The resulting data set is undersampled and therefore an iterative parallel imaging algorithm is applied to remove aliasing artifacts. Radial TSE images of the human brain reconstructed with the proposed method show an improved contrast when compared to Cartesian TSE images or radial TSE images with conventional KWIC reconstructions. The proposed method provides multi-contrast images from radial TSE data with contrasts similar to multi spin-echo images. Contaminations from unwanted contrast weightings are strongly reduced.
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