RAPID 3D CINE MR SEQUENCE FOR CARDIAC IMAGING

简介：磁共振（MR）可以测量生理 心搏量、心输出量和射血等参数 分数 我们设计了一种快速3D序列， 电影模式下的数据。 方法：使用增强梯度，非常短 可以获得大约5 ms的重复时间（TR）。 所有 在每个心脏期间，截面方向相位编码被交错 拍;面内相位编码值在每次加热后更新 beat. 由于TR值较短，固有对比度较差。 因此，T1还原剂如Gd-DTPA用于提供 血液和组织的对比。 结果：时间分辨率 类似于分段k空间采集，整个心脏可以 与传统的2D电影扫描同时成像。 优秀 在血液和心肌之间可以看到对比， 边界在整个心动周期内都很好地可视化。 一个 3D成像模式的优点是数据可以重新格式化 在任何飞机上。 结论： 因为血液发出的信号 对血流相关增强的依赖性更低，对比度更一致 可以获得血液和心肌之间的关系。 钆基 化合物可以产生一些心肌增强，然而这可以是 通过使用持久性血管内药物消除。

Introduction: Magnetic Resonance (MR) can measure physiological parameters such as stroke volume, cardiac output and ejection fraction. We have designed a fast 3D sequence to acquire volumetric data in cine mode. Methods: Using enhanced gradients, very short repetition times (TR) of approximately 5 ms can be obtained. All section-direction phase encodes are interleaved during each heart beat; in-plane phase-encoding values are updated after every heat beat. Due to the short TR values, the inherent contrast is poor. Therefore, a T1 reducing agent such as Gd-DTPA is used to provide contrast between blood and tissue. Results: The temporal resolution is similar to segmented k-space acquisitions, and the entire heart can be imaged in the same time as a traditional 2D cine scan. Excellent contrast is seen between the blood and myocardium, and the endocardial border is well visualized throughout the entire cardiac cycle. An advantage of the 3D imaging mode is that the data can be reformatted in any plane. Conclusions: . Because the signal from blood is now less dependent on flow-related enhancement, more consistent contrast between blood and myocardium can be obtained. Gadolinium-based compounds can produce some myocardial enhancement, however this can be eliminated with the use of a persistent intravascular agent.