Contrast-enhanced peripheral magnetic resonance angiography using time-resolved vastly undersampled isotropic projection reconstruction
Contrast-enhanced peripheral magnetic resonance angiography using time-resolved vastly undersampled isotropic projection reconstruction
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DOI：
10.1002/jmri.20189
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发表时间：
2004-11-01
影响因子：
4.4
通讯作者：
Block, WF
中科院分区：
文献类型：
--
作者：
Du, J;Carroll, TJ;Block, WF
目的：探讨时间分辨极欠采样各向同性投影重建（VIPR）在肢体远端对比增强磁共振血管成像中的应用（单站），以及腹部、大腿和小腿的外周流出血管系统材料和方法：通过比较两种采集矩阵尺寸，使用VIPR序列进行时间分辨远端肢体成像：256例TR/TE = 3.7/1.4 msec，320例TR/TE = 4.5/1.8 msec。VIPR采集与团注追踪技术相结合，对外周流出血管进行成像。时间分辨的图像重建使用修订的滑动窗口重建滤波器的时间孔径仍然狭窄的低空间频率和增加二次方，包括所有的投影数据为高空间frequency.Results：新的时间滤波器，显着抑制采样不足条纹文物和静脉污染，同时保持高的时间分辨率。高空间分辨率（范围从1.56 X 1.56 X 1.56 mm到1.25 X 1.25 X 1.25 mm）和高时间分辨率（每帧三秒）远端肢体图像和外周径流图像使用时间分辨VIPR采集生成，其提供各向同性空间分辨率和各向同性覆盖。通过提供各向同性空间分辨率、各向同性覆盖和高时间分辨率，时间分辨VIPR采集被证明非常适合于远端肢体成像。结合时间分辨VIPR和团追踪技术，为外周径流检查提供了一种新的方法。(C)2004威利-利斯公司
Purpose: To investigate the application of time-resolved vastly undersampled isotropic projection reconstruction (VIPR) in contrast-enhanced magnetic resonance angiography of the distal extremity (single station), and peripheral run-off vasculature in the abdomen, thigh, and calf (three stations).Materials and Methods: Time-resolved distal extremity imaging was performed using VIPR sequence through the comparison of,two acquisition matrix sizes: 256 with TR/TE = 3.7/1.4 msec and 320 with TR/TE 4.5/1.8 msec under the same scan time of two minutes. VIPR acquisition was combined with a bolus-chase technique to image the peripheral run-off vasculature. The time-resolved images were reconstructed using a revised sliding window reconstruction filter whose temporal aperture remained narrow for low spatial frequencies and increased quadratically to include all the projection data for high spatial frequencies.Results: The new temporal filter, significantly suppressed the undersampling streak artifacts and venous contamination, while maintaining a high temporal resolution. Both high spatial resolution (ranging from 1.56 X 1.56 X 1.56 nun to 1.25 X 1.25 X 1.25 mm) and high temporal resolution (three seconds per frame) distal extremity images and peripheral run-off images were generated using time-resolved VIPR acquisition, which provides isotropic spatial resolution and isotropic coverage.Conclusion: Time-resolved VIPR acquisition was demonstrated to be well suited for distal extremity imaging by providing isotropic spatial resolution, isotropic coverage, and high temporal resolution. combination of time-resolved VIPR and bolus chase technique., provided a novel approach for peripheral run-off-examinations. (C) 2004 Wiley-Liss, Inc.