Dynamic imaging of contrast-enhanced coronary vessels with a magnetization prepared rotated stripe keyhole acquisition.
Dynamic imaging of contrast-enhanced coronary vessels with a magnetization prepared rotated stripe keyhole acquisition.
复制标题
使用磁化准备的旋转条纹锁孔采集对对比度增强的冠状血管进行动态成像。
DOI：
10.1002/jmri.20796
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Tsekos,NikolaosV
中科院分区：
文献类型：
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作者：
Gui,Dawei;Tsekos,NikolaosV
PurposeTo评价动态冠状动脉成像的基础上磁化准备对比增强（CE）旋转条纹keyhole acquisition scheme.Materials和MethodsBackground抑制长T1组织使用，使k空间将选择性地占主导地位的CE血管的贡献。然后将相位编码轴调整为平行于血管的长轴，以对血管的有效功率谱进行采样。这种方法的性能进行了评估，通过计算机模拟和实验研究的幻影和猪模型仪器与冠状动脉内导管注入contrast medium.ResultsComputer模拟和幻影研究表明，通过旋转梯度轴，以匹配thek空间模式的频谱，可以将锁孔带减少到全k空间的20%，同时保持结构的管腔宽度和锐度。体内研究验证了这些发现，并获得动态血管造影的CE冠状动脉的图像，以140毫秒每幅图像，与面内空间分辨率为1.5 mm。ConclusionWith efficient background suppression，a rotated stripes keyhole acquisition can efficiently acquire significantk-space of a CE vessel，and provide improved vessel definition with a reduced acquisition matrices scheme. J.磁共振Imaging 2007.© 2006 Wiley利斯公司
PurposeTo evaluate dynamic coronary imaging based on a magnetization prepared contrast‐enhanced (CE) rotated stripe keyhole acquisition scheme.Materials and MethodsBackground suppression of long T1tissue was used so that thek‐space would be selectively dominated by the contribution of the CE vessel. The phase‐encoding axis was then adjusted parallel to the long axis of the vessel to sample the significant power spectrum of the vessel. The performance of this approach was evaluated by means of computer simulations and experimental studies on phantoms and a pig model instrumented with an intracoronary catheter for infusion of contrast media.ResultsComputer simulations and phantom studies demonstrated that by rotating the gradient axes to match thek‐space pattern of the frequency spectrum, one can reduce the keyhole band to 20% of the fullk‐space while preserving the structure's lumen width and sharpness. In vivo studies validated those findings, and dynamic angiograms of the CE coronary arteries were obtained as rapidly as 140 msec per image, with an in‐plane spatial resolution of 1.5 mm.ConclusionWith efficient background suppression, a rotated stripes keyhole acquisition can efficiently acquire the significantk‐space of a CE vessel, and provide improved vessel definition with a reduced acquisition matrices scheme. J. Magn. Reson. Imaging 2007. © 2006 Wiley‐Liss, Inc.