Three-dimensional coronary MR angiography performed with subject-specific cardiac acquisition windows and motion-adapted respiratory gating
Three-dimensional coronary MR angiography performed with subject-specific cardiac acquisition windows and motion-adapted respiratory gating
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DOI：
10.2214/ajr.180.2.1800505
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发表时间：
2003-02-01
影响因子：
5
通讯作者：
Sivananthan, MU
中科院分区：
文献类型：
--
作者：
Plein, S;Jones, TR;Sivananthan, MU
客观的。在冠状动脉磁共振血管造影中，传统上仅在心动周期和呼吸周期的短且固定周期内接受数据。我们假设一种更灵活且针对特定主题的心脏和呼吸门控方法可能会缩短扫描时间，同时保持图像质量。主题和方法。我们实现了一种采集技术，该技术使用心动周期中特定于受试者的采集窗口和用于呼吸导航器门控的运动自适应门控窗口。心脏采集窗口和触发延迟是根据冠状动脉运动扫描单独确定的。运动自适应门控对中心 35% 的 k 空间使用 2 毫米接受窗口，对外部 65% 的 k 空间使用 6 毫米窗口。使用该技术（“自适应技术”）和传统采集方法对 10 名受试者的左右冠状动脉系统进行了三维冠状动脉 MR 血管造影，并对扫描时间和图像质量进行了比较。然后将自适应技术前瞻性地应用于 40 名接受冠状动脉造影的患者。 结果。与传统技术相比，自适应技术的右冠状动脉扫描时间减少了 2.3 倍，左冠状动脉系统扫描时间减少了 2.2 倍，这主要是因为我们能够在低心率患者中使用更长的特定对象采集窗口。图像质量的主观和客观测量表明两种技术之间没有显着差异。 MR 血管造影的前瞻性评估检测显着冠状动脉狭窄的敏感性和特异性分别为 74.3% 和 88.2%。结论。具有特定对象采集窗口和运动自适应呼吸门控的冠状动脉 MR 血管造影可减少扫描时间，同时保持图像质量，并为冠状动脉狭窄检测提供高诊断准确性。
OBJECTIVE. In coronary MR angiography, data are conventionally accepted in only short and fixed periods of the cardiac and respiratory cycles. We hypothesized that a more flexible and subject-specific approach to cardiac and respiratory gating may shorten scanning times while maintaining image quality.SUBJECTS AND METHODS. We implemented an acquisition technique that uses subject-specific acquisition windows in the cardiac cycle and a motion-adapted gating window for respiratory navigator gating. Cardiac acquisition windows and trigger delays were determined individually from a coronary motion scan. Motion-adapted gating used a 2-mm acceptance window for the central 35% of k-space and a 6-mm window for the outer 65% of k-space. In 10 subjects, three-dimensional coronary MR angiograms of the right and left coronary systems were acquired with this technique (the "adaptive technique") as well as a conventional acquisition method, and the scanning times and image quality were compared. The adaptive technique was then applied prospectively to 40 patients who underwent coronary radiographic angiography.RESULTS. Scanning times with the adaptive technique were reduced by a factor of 2.3 for the right coronary artery and by a factor of 2.2 for the left coronary artery system compared with the conventional technique, mainly because we were able to use longer subject-specific acquisition windows in patients with low heart rates. Subjective and objective measurements of image quality showed no significant differences between the two techniques. Prospective evaluation of MR angiograms, yielded a sensitivity and specificity of 74.3% and 88.2%, respectively, to detect significant coronary artery stenoses.CONCLUSION. Coronary MR angiography with subject-specific acquisition windows and motion-adapted respiratory gating reduces scanning times while maintaining image quality and provides high diagnostic accuracy for the detection of coronary artery stenosis.