Combined time-resolved and high-spatial-resolution 3D MRA using an extended adaptive acquisition.
Combined time-resolved and high-spatial-resolution 3D MRA using an extended adaptive acquisition.
复制标题
使用扩展自适应采集将时间分辨和高空间分辨率 3D MRA 相结合。
DOI：
10.1002/jmri.10071
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Grist,ThomasM
中科院分区：
文献类型：
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作者：
Mazaheri,Yousef;Carroll,TimothyJ;Du,Jiang;Block,WalterF;Fain,SeanB;Hany,ThomasF;Aagaard,BeverlyDL;Strother,CharlesM;Mistretta,CharlesA;Grist,ThomasM
目的在合理的扫描时间内结合时间分辨动态成像和单椭圆中心采集的优点。材料和方法采用对比动力学三维时间分辨成像（3D TRICKS）技术，在对比到达过程中进行椭圆中心编码，获得中等空间分辨率的时间序列图像。静脉混浊后，获得一个完整的大中心编码k空间体积。该体积的高空间频率部分与3D TRICKS时间框架相结合，形成高分辨率图像。通过抑制背景和信号平均所有获取的数据，包括静脉后的低空间频率数据，形成额外的单个图像。对于该图像，使用二维时间相关分析来抑制低空间频率静脉的贡献。利用到达时间和空间相关性来抑制背景。结果可以选择3D TRICKS时间框架，以确保对任何血管区域具有最佳中央k空间采样的组合高分辨率图像。通过对采集到的所有数据进行信号平均而形成的单幅图像提高了信噪比（CNR）和信噪比（SNR）。结论采用扩展的双相位采集技术，将时间分辨率成像和高空间分辨率成像的优势结合起来。通过信号平均可以获得一定的信噪比和信噪比增益。背景和静脉抑制促进了这一过程。j .增效。的原因。成像2002;15:291 - 301。©2002 Wiley‐Liss, Inc。
PurposeTo combine the benefits of time‐resolved dynamic imaging and single elliptical centric acquisitions in a reasonable scan time.Materials and MethodsA time series of images with moderate spatial resolution was acquired using the 3D Time‐Resolved Imaging of Contrast KineticS (3D TRICKS) technique with elliptical centric encoding during contrast arrival. Following venous opacification, a complete large centrically encoded k‐space volume was acquired. The high‐spatial‐frequency portions of this volume were combined with a 3D TRICKS time frame to form a high‐resolution image. An additional single image is formed by suppressing background and signal averaging all acquired data, including post‐venous low‐spatial‐frequency data. For this image, 2D temporal correlation analysis is used to suppress low‐spatial‐frequency vein contributions. Arrival time and spatial correlations are used to suppress background.ResultsThe 3D TRICKS time frame may be selected to ensure a combined high‐resolution image that has optimal central k‐space sampling for any vascular region. The single image formed by signal averaging all acquired data has increased contrast‐to‐noise (CNR) and signal‐to‐noise (SNR) ratios.ConclusionThe advantages of time‐resolved and high‐spatial‐resolution imaging were combined using an extended dual‐phase acquisition. Some SNR and CNR gain was achieved by signal averaging. This process is facilitated by background and vein suppression. J. Magn. Reson. Imaging 2002;15:291–301. © 2002 Wiley‐Liss, Inc.