Free-breathing cardiac MR with a fixed navigator efficiency using adaptive gating window size.
Free-breathing cardiac MR with a fixed navigator efficiency using adaptive gating window size.
复制标题
使用自适应门控窗口尺寸的固定导航器效率的自由呼吸心脏MR。
DOI：
10.1002/mrm.24210
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发表时间：
2012-12
影响因子：
3.3
通讯作者：
Nezafat, Reza
中科院分区：
文献类型：
--
作者：
Moghari, Mehdi H.;Chan, Raymond H.;Hong, Susie N.;Shaw, Jaime L.;Goepfert, Lois A.;Kissinger, Kraig V.;Goddu, Beth;Josephson, Mark E.;Manning, Warren J.;Nezafat, Reza
关键词：
具有固定接受门控窗口的呼吸导航器通常用于减少心脏MR中的呼吸运动伪影。这种方法缩短了扫描时间，偶尔会由于呼吸漂移而产生不完整的数据集。为了解决这个问题，我们提出了一种自适应门控窗口的方法，其中门控窗口的大小和位置在采集过程中根据个人的呼吸模式自适应地改变。自适应门控窗口在整个扫描过程中跟踪受试者的呼吸模式，并调整门控窗口的大小和位置，使得门控效率始终固定在恒定值。为了研究图像质量和采集时间，使用所提出的导航技术对67名受试者进行了自由呼吸心脏MRI，包括靶向冠状动脉MRI和晚期钆增强（LGE）成像。使用传统和建议的自适应门控窗口技术，从11名健康成人受试者中获得靶向冠状动脉MRI。五十六例心脏MRI患者也使用LGE与建议的自适应门控窗口技术成像。主观和客观的图像评估被用来评估所提出的方法。结果表明，所提出的技术允许在相对固定的时间内进行自由呼吸心脏MRI，而不会因呼吸运动伪影而影响成像质量。
A respiratory navigator with a fixed acceptance gating window is commonly used to reduce respiratory motion artifacts in cardiac MR. This approach prolongs the scan time and occasionally yields an incomplete dataset due to respiratory drifts. To address this issue, we propose an adaptive gating window approach in which the size and position of the gating window are changed adaptively during the acquisition based on the individual’s breathing pattern. The adaptive gating window tracks the breathing pattern of the subject throughout the scan and adapts the size and position of the gating window such that the gating efficiency is always fixed at a constant value. To investigate the image quality and acquisition time, free breathing cardiac MRI, including both targeted coronary MRI and late gadolinium enhancement (LGE) imaging, was performed in 67 subjects using the proposed navigator technique. Targeted coronary MRI was acquired from eleven healthy adult subjects using both the conventional and proposed adaptive gating window techniques. Fifty-six patients referred for cardiac MRI were also imaged using LGE with the proposed adaptive gating window technique. Subjective and objective image assessments were used to evaluate the proposed method. The results demonstrate that the proposed technique allows free-breathing cardiac MRI in a relatively fixed time without compromising imaging quality due to respiratory motion artifacts.
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