Impact of navigator timing on free-breathing submillimeter 3D coronary magnetic resonance angiography
Impact of navigator timing on free-breathing submillimeter 3D coronary magnetic resonance angiography
复制标题
DOI：
10.1002/mrm
复制
发表时间：
2002-01-01
影响因子：
3.3
通讯作者：
Stuber, M
中科院分区：
文献类型：
--
作者：
Spuentrup, E;Manning, WJ;Stuber, M
本研究的目的是研究导航仪定时对导航仪门控和实时运动校正、自由呼吸、三维（3D）冠状动脉MR血管造影（MRA）（亚毫米空间图像分辨率）图像质量的影响。进行了体模和体内研究。使用可变导航器时间延迟（导航器和成像序列之间的时间延迟）和不同的空间分辨率，应用实时导航器技术的3D冠状动脉MRA。定量客观和主观图像质量参数进行了评估。对于高分辨率成像，发现图像质量降低是导航器时间延迟增加的函数。较低空间分辨率的冠状动脉MRA显示对导航仪时间的敏感性较小。这些发现在志愿者和幻影实验中是一致的。总之，对于亚毫米导航器门控和实时运动校正的3D冠状动脉MRA，缩短导航器和序列成像部分之间的时间延迟对于提高空间分辨率变得越来越重要。Magn Reson Med 47：196-201，2002年。(C)2002 Wiley-Liss，Inc.
The purpose of this study was to investigate the impact of navigator timing on image quality in navigator-gated and realtime motion-corrected, free-breathing, three-dimensional (3D) coronary MR angiography (MRA) with submillimeter spatial image resolution. Both phantom and in vivo investigations were performed. 3D coronary MRA with real-time navigator technology was applied using variable navigator time delays (time delay between the navigator and imaging sequences) and varying spatial resolutions. Quantitative objective and subjective image quality parameters were assessed. For high-resolution imaging, reduced image quality was found as a function of increasing navigator time delay. Lower spatial resolution coronary MRA showed only minor sensitivity to navigator timing. These findings were consistent among volunteers and phantom experiments. In conclusion, for submillimeter navigator-gated and real-time motion-corrected 3D coronary MRA, shortening the time delay between the navigator and the imaging portion of the sequence becomes increasingly important for improved spatial resolution. Magn Reson Med 47:196-201, 2002. (C) 2002 Wiley-Liss, Inc.