Moghari Mehdi H, Geva Tal, Powell Andrew J
Department of Cardiology, Boston Children's Hospital, Boston, Massachusetts, USA.
Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA.
Magn Reson Med. 2017 Feb;77(2):759-765. doi: 10.1002/mrm.26117. Epub 2016 Feb 4.
To develop a prospective respiratory-gating technique (Heart-NAV) for use with contrast-enhanced three-dimensional (3D) inversion recovery (IR) whole-heart magnetic resonance angiography (MRA) acquisitions that directly tracks heart motion without creating image inflow artifact.
With Heart-NAV, one of the startup pulses for the whole-heart steady-state free precession MRA sequence is used to collect the centerline of k-space, and its one-dimensional reconstruction is fed into the standard diaphragm-navigator (NAV) signal analysis process to prospectively gate and track respiratory-induced heart displacement. Ten healthy volunteers underwent non-contrast whole-heart MRA acquisitions using the conventional diaphragm-NAV and Heart-NAV with 5 and 10-mm acceptance windows in a 1.5T scanner. Five patients underwent contrast-enhanced IR whole-heart MRA using a diaphragm-NAV and Heart-NAV with a 5-mm acceptance window.
For non-contrast whole-heart MRA with both the 5 and 10-mm acceptance windows, Heart-NAV yielded coronary artery vessel sharpness and subjective visual scores that were not significantly different than those using a conventional diaphragm-NAV. Scan time for Heart-NAV was 10% shorter (p < 0.05). In patients undergoing contrast-enhanced IR whole-heart MRA, inflow artifact was seen with the diaphragm-NAV but not with Heart-NAV.
Compared with a conventional diaphragm-NAV, Heart-NAV achieves similar image quality in a slightly shorter scan time and eliminates inflow artifact. Magn Reson Med 77:759-765, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
开发一种前瞻性呼吸门控技术（心脏导航技术，Heart-NAV），用于对比增强三维（3D）反转恢复（IR）全心磁共振血管造影（MRA）采集，该技术可直接追踪心脏运动而不产生图像流入伪影。
使用心脏导航技术（Heart-NAV）时，全心稳态自由进动MRA序列的起始脉冲之一用于采集k空间的中心线，其一维重建结果被输入到标准膈肌导航器（NAV）信号分析过程中，以前瞻性地门控和追踪呼吸引起的心脏位移。10名健康志愿者在1.5T扫描仪中使用传统膈肌导航器（NAV）和心脏导航技术（Heart-NAV），分别采用5毫米和10毫米的接受窗进行非对比全心MRA采集。5名患者使用膈肌导航器（NAV）和心脏导航技术（Heart-NAV），采用5毫米的接受窗进行对比增强IR全心MRA。
对于采用5毫米和10毫米接受窗的非对比全心MRA，心脏导航技术（Heart-NAV）获得的冠状动脉血管清晰度和主观视觉评分与使用传统膈肌导航器（NAV）时相比无显著差异。心脏导航技术（Heart-NAV）的扫描时间缩短了10%（p < 0.05）。在接受对比增强IR全心MRA的患者中，使用膈肌导航器（NAV）时可见流入伪影，而使用心脏导航技术（Heart-NAV）时未见。
与传统膈肌导航器（NAV）相比，心脏导航技术（Heart-NAV）在稍短的扫描时间内可实现相似的图像质量，并消除流入伪影。《磁共振医学》77:759 - 765, 2017。© 2016国际磁共振医学学会。
