脉动流的流速测量

Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society Pub Date : 1900-01-01 DOI:10.1109/IEMBS.1988.94543

D. Saloner

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引用次数: 0

摘要

磁共振成像对运动的固有敏感性使其特别适合作为一种非侵入性流量测量方式。讨论了一种脉冲序列，该脉冲序列通过使运动材料受到反向纵向磁化的脉冲来标记运动材料。这种脉冲的重复应用产生了一个稳态的磁化分布，反映了通过激励区域的物质运动的历史。该序列对来自静止材料的信号产生强烈的抑制，增强了来自移动材料的信号的动态范围。特别是，血管造影型投影图像的血流在人类受试者已获得与门控采集。这些图像显示了在动脉和静脉中流动的标记血液。波在一个方向上和通过一段距离的位移反映了容器中速度的时空变化。

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Flow velocity measurements for pulsatile flow

The inherent sensitivity of magnetic resonance imaging to motion makes it particularly well-suited as a noninvasive flow measurement modality. A pulse sequence which labels moving material by subjecting it to a pulse that inverts the longitudinal magnetization is discussed. Repeated application of this pulse produces a steady-state distribution of magnetization reflecting the history of material motion through the region of excitation. The sequence produces a strong suppression of signal from stationary material enhancing the dynamic range available to signal from moving material. In particular, angiographic-type projection images of flow in human subjects have been obtained with gated acquisition. These images display boli of tagged blood moving in arteries and veins. The boli are displaced in a direction and through a distance reflecting the temporal and spatial variation of velocity in the vessel.<>

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Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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